2002 DODGE RAM ac compressor

The fuel pump is activated by the PCM through
the fuel pump relay.
Voltage is applied to the fuel injectors with the
ASD relay via the PCM. The PCM will then control
the injection sequence and injector pulse width by
turning the ground circuit to each individual injector
on and off.
The PCM determines the proper ignition timing
according to input received from the crankshaft posi-
tion sensor.
ENGINE WARM-UP MODE
This is an Open Loop mode. During engine warm-
up, the PCM receives inputs from:
²Battery voltage
²Crankshaft position sensor
²Engine coolant temperature sensor
²Intake manifold air temperature sensor
²Manifold absolute pressure (MAP) sensor
²Throttle position sensor (TPS)
²Camshaft position sensor signal (in the distribu-
tor)
²Park/neutral switch (gear indicator signalÐauto.
trans. only)
²Air conditioning select signal (if equipped)
²Air conditioning request signal (if equipped)
Based on these inputs the following occurs:
²Voltage is applied to the fuel injectors with the
ASD relay via the PCM. The PCM will then control
the injection sequence and injector pulse width by
turning the ground circuit to each individual injector
on and off.
²The PCM adjusts engine idle speed through the
idle air control (IAC) motor and adjusts ignition tim-
ing.
²The PCM operates the A/C compressor clutch
through the clutch relay. This is done if A/C has been
selected by the vehicle operator and requested by the
A/C thermostat.
²When engine has reached operating tempera-
ture, the PCM will begin monitoring O2S sensor
input. The system will then leave the warm-up mode
and go into closed loop operation.
IDLE MODE
When the engine is at operating temperature, this
is a Closed Loop mode. At idle speed, the PCM
receives inputs from:
²Air conditioning select signal (if equipped)
²Air conditioning request signal (if equipped)
²Battery voltage
²Crankshaft position sensor
²Engine coolant temperature sensor
²Intake manifold air temperature sensor
²Manifold absolute pressure (MAP) sensor
²Throttle position sensor (TPS)²Camshaft position sensor signal (in the distribu-
tor)
²Battery voltage
²Park/neutral switch (gear indicator signalÐauto.
trans. only)
²Oxygen sensors
Based on these inputs, the following occurs:
²Voltage is applied to the fuel injectors with the
ASD relay via the PCM. The PCM will then control
injection sequence and injector pulse width by turn-
ing the ground circuit to each individual injector on
and off.
²The PCM monitors the O2S sensor input and
adjusts air-fuel ratio by varying injector pulse width.
It also adjusts engine idle speed through the idle air
control (IAC) motor.
²The PCM adjusts ignition timing by increasing
and decreasing spark advance.
²The PCM operates the A/C compressor clutch
through the clutch relay. This happens if A/C has
been selected by the vehicle operator and requested
by the A/C thermostat.
CRUISE MODE
When the engine is at operating temperature, this
is a Closed Loop mode. At cruising speed, the PCM
receives inputs from:
²Air conditioning select signal (if equipped)
²Air conditioning request signal (if equipped)
²Battery voltage
²Engine coolant temperature sensor
²Crankshaft position sensor
²Intake manifold air temperature sensor
²Manifold absolute pressure (MAP) sensor
²Throttle position sensor (TPS)
²Camshaft position sensor signal (in the distribu-
tor)
²Park/neutral switch (gear indicator signalÐauto.
trans. only)
²Oxygen (O2S) sensors
Based on these inputs, the following occurs:
²Voltage is applied to the fuel injectors with the
ASD relay via the PCM. The PCM will then adjust
the injector pulse width by turning the ground circuit
to each individual injector on and off.
²The PCM monitors the O2S sensor input and
adjusts air-fuel ratio. It also adjusts engine idle
speed through the idle air control (IAC) motor.
²The PCM adjusts ignition timing by turning the
ground path to the coil on and off.
²The PCM operates the A/C compressor clutch
through the clutch relay. This happens if A/C has
been selected by the vehicle operator and requested
by the A/C thermostat.
8E - 16 ELECTRONIC CONTROL MODULESBR/BE
POWERTRAIN CONTROL MODULE (Continued)

OPERATION
OPERATION - PCM - GAS ENGINES
The PCM operates the fuel system. The PCM is a
pre-programmed, triple microprocessor digital com-
puter. It regulates ignition timing, air-fuel ratio,
emission control devices, charging system, certain
transmission features, speed control, air conditioning
compressor clutch engagement and idle speed. The
PCM can adapt its programming to meet changing
operating conditions.
The PCM receives input signals from various
switches and sensors. Based on these inputs, the
PCM regulates various engine and vehicle operations
through different system components. These compo-
nents are referred to as Powertrain Control Module
(PCM) Outputs. The sensors and switches that pro-
vide inputs to the PCM are considered Powertrain
Control Module (PCM) Inputs.
The PCM adjusts ignition timing based upon
inputs it receives from sensors that react to: engine
rpm, manifold absolute pressure, engine coolant tem-
perature, throttle position, transmission gear selec-
tion (automatic transmission), vehicle speed and the
brake switch.
The PCM adjusts idle speed based on inputs it
receives from sensors that react to: throttle position,
vehicle speed, transmission gear selection, engine
coolant temperature and from inputs it receives from
the air conditioning clutch switch and brake switch.
Based on inputs that it receives, the PCM adjusts
ignition coil dwell. The PCM also adjusts the gener-
ator charge rate through control of the generator
field and provides speed control operation.
NOTE: PCM Inputs:
²A/C request (if equipped with factory A/C)
²A/C select (if equipped with factory A/C)
²Auto shutdown (ASD) sense
²Battery temperature
²Battery voltage
²Brake switch
²CCD bus (+) circuits
²CCD bus (-) circuits
²Camshaft position sensor signal
²Crankshaft position sensor
²Data link connection for DRB scan tool
²Engine coolant temperature sensor
²Fuel level
²Generator (battery voltage) output
²Ignition circuit sense (ignition switch in on/off/
crank/run position)
²Intake manifold air temperature sensor
²Leak detection pump (switch) sense (if equipped)
²Manifold absolute pressure (MAP) sensor²Oil pressure
²Output shaft speed sensor
²Overdrive/override switch
²Oxygen sensors
²Park/neutral switch (auto. trans. only)
²Power ground
²Sensor return
²Signal ground
²Speed control multiplexed single wire input
²Throttle position sensor
²Transmission governor pressure sensor
²Transmission temperature sensor
²Vehicle speed inputs from ABS or RWAL system
NOTE: PCM Outputs:
²A/C clutch relay
²Auto shutdown (ASD) relay
²CCD bus (+/-) circuits for: speedometer, voltme-
ter, fuel gauge, oil pressure gauge/lamp, engine temp.
gauge and speed control warn. lamp
²Data link connection for DRB scan tool
²EGR valve control solenoid (if equipped)
²EVAP canister purge solenoid
²Five volt sensor supply (primary)
²Five volt sensor supply (secondary)
²Fuel injectors
²Fuel pump relay
²Generator field driver (-)
²Generator field driver (+)
²Generator lamp (if equipped)
²Idle air control (IAC) motor
²Ignition coil
²Leak detection pump (if equipped)
²Malfunction indicator lamp (Check engine lamp).
Driven through CCD circuits.
²Overdrive indicator lamp (if equipped)
²Service Reminder Indicator (SRI) Lamp (MAINT
REQ'D lamp). Driven through CCD circuits.
²Speed control vacuum solenoid
²Speed control vent solenoid
²Tachometer (if equipped). Driven through CCD
circuits.
²Transmission convertor clutch circuit
²Transmission 3±4 shift solenoid
²Transmission relay
²Transmission temperature lamp (if equipped)
²Transmission variable force solenoid
OPERATION - DIESEL
Two different control modules are used: The Pow-
ertrain Control Module (PCM), and the Engine Con-
trol Module (ECM). The ECMcontrolsthe fuel
system. The PCMdoes not controlthe fuel system.
The PCM's main function is to control: the vehicle
charging system, speed control system, transmission,
air conditioning system and certain bussed messages.
8E - 18 ELECTRONIC CONTROL MODULESBR/BE
POWERTRAIN CONTROL MODULE (Continued)

(4) Disconnect the starter motor signal wire har-
ness connector, located on the PDC housing.
(5) Disengage wire harness assembly pushpin
retainers.
(6) From under the vehicle, disengage wire har-
ness assembly pushpin retainers.
(7) Remove the positive battery cable from the
starter motor B+ terminal stud.
(8) Remove the starter motor trigger wire from the
starter motor.
(9) Remove the positive cable wire harness assem-
bly from the vehicle.
NEGATIVE CABLE REMOVAL - GASOLINE
ENGINE
Both the battery negative cable and the battery
positive cable are serviced in the battery wire har-
ness. If either battery cable is damaged or faulty, the
battery wire harness unit must be replaced.
(1) Turn the ignition switch to the Off position. Be
certain that all electrical accessories are turned off.
(2) Loosen the battery negative cable terminal
clamp pinch-bolt hex nut.
(3) Disconnect the battery negative cable terminal
clamp from the battery negative terminal post. If
necessary, use a battery terminal puller to remove
the terminal clamp from the battery post.
(4) Remove the negative cable jumper from the left
side of the radiator closure panel.
(5) Remove the negative cable jumper from the left
side of the frame assembly.
(6) Remove the PDC cover and remove the gener-
ator output wire from the PDC.
(7) Following the wire, remove the pushpin retain-
ers holding the wire assembly in place.
(8) Remove the negative cable eyelet from the
power steering pump pivot bolt.
(9) Remove the generator output wire from the
generator.
(10) Remove the negative battery cable assembly,
by fishing out from under the compressor mounting
bracket, if equipped.
INSTALLATION
POSITIVE CABLE INSTALLATION - GASOLINE
ENGINE
(1) Position the battery wire harness into the
engine compartment.
(2) Install the positive battery cable on the battery.
(3) Install the positive battery cable on the PDC.
(4) Install the cover on the PDC.
(5) Connect the starter motor signal wire harness
connector, located on the PDC housing.(6) Install wire harness assembly pushpin retain-
ers in their original position.
(7) From under the vehicle, install wire harness
assembly pushpin retainers.
(8) Install and tighten the nut that secures the
battery positive cable eyelet terminal to the B(+) ter-
minal stud on the starter solenoid. Tighten the nut to
10 N´m (90 in. lbs.).
(9) Connect the starter motor trigger wire on the
starter motor.
(10) Reconnect the battery positive cable terminal
clamp to the battery positive terminal post. Tighten
the terminal clamp pinch-bolt hex nut to 4 N´m (35
in. lbs.).
(11) Apply a thin coating of petroleum jelly or
chassis grease to the exposed surfaces of the battery
cable terminal clamps and the battery terminal
posts.
NEGATIVE CABLE INSTALLATION - GASOLINE
ENGINE
(1) Position the battery wire harness into the
engine compartment and under the compressor
mounting bracket, if equipped.
(2) Install and tighten the nut that secures the
battery negative cable ground eyelet terminal to the
stud on the power steering pump pivot bolt.
(3) Install the generator output cable eyelet termi-
nal onto the generator output terminal stud.
(4) Install and tighten the nut that secures the
generator output cable eyelet terminal to the genera-
tor output terminal stud. Tighten the nut to 8.4 N´m
(75 in. lbs.).
(5) Position the cover for the generator output ter-
minal stud housing onto the back of the generator
and snap it into place.
(6) Secure wire assembly in place with pushpin
retainers in there original positions.
(7) Install and tighten the screw that secures the
battery negative cable eyelet terminal to the radiator
closure panel, near the battery. Tighten the screw to
40 in. lbs.
(8) Install and tighten the screw that secures the
battery negative cable eyelet terminal to the left
front side of the frame assembly. Tighten the screw
to 80 in. lbs.
(9) Install and tighten the nut that secures the
battery positive cable eyelet terminal and the gener-
ator output cable eyelet terminal to the PDC B(+)
terminal stud. Tighten the nut to 80 in. lbs.
(10) Reconnect the battery negative cable terminal
clamp to the battery negative terminal post. Tighten
the terminal clamp pinch-bolt hex nut to 35 in. lbs.
(11)
Apply a thin coating of petroleum jelly or chas-
sis grease to the exposed surfaces of the battery cable
terminal clamps and the battery terminal posts.
8F - 22 BATTERY SYSTEMBR/BE
BATTERY CABLE (Continued)

8W-02 COMPONENT INDEX
Component Page
4WD Switch.......................... 8W-31
A/C Compressor Clutch Relay............ 8W-42
A/C Compressor Clutch................. 8W-42
A/C- Heater Control.................... 8W-42
A/C Heater Temperature Select........... 8W-42
A/C High Pressure Switch............... 8W-42
A/C Low Pressure Switch................ 8W-42
Accelerator Pedal Position Sensor......... 8W-30
Aftermarket Center High Mounted Stop
Lamp............................. 8W-51
Aftermarket Trailer Tow Connector........ 8W-54
Airbag Control Module.................. 8W-43
Ambient Temperature Sensor............ 8W-49
Ash Receiver Lamp.................... 8W-44
Automatic Day/Night Mirror............. 8W-49
Automatic Shut Down Relay............. 8W-30
Auxiliary Battery...................... 8W-20
Back-Up Lamp Switch.................. 8W-51
Back-Up Lamp........................ 8W-51
Battery Temperature Sensor............. 8W-30
Battery............................. 8W-20
Blend Door Actuator................... 8W-42
Blower Motor Relay.................... 8W-42
Blower Motor Resistor Block............. 8W-42
Blower Motor......................... 8W-42
Brake Lamp Switch.................... 8W-51
Brake Pressure Switch............... 8W-34, 35
Bypass Jumper....................... 8W-21
Camshaft Position Sensor............... 8W-30
Capacitor......................... 8W-10, 30
Cargo Lamps........................ 8W-44
Center High Mounted Stop Lamps........ 8W-51
Center Identification Lamp.............. 8W-50
Central Timer Module.................. 8W-45
Cigar Lighter......................... 8W-41
Circuit Breakers...................... 8W-12
Clockspring.................. 8W-33, 41, 43, 47
Clutch Pedal Position Switch............. 8W-21
Combination Flasher................... 8W-52
Controller Antilock Brake............ 8W-34, 35
Crankshaft Position Sensor.............. 8W-30
Cummins Bus........................ 8W-18
Cup Holder Lamp..................... 8W-44
Data Link Connector................... 8W-18
Daytime Running Lamp Module.......... 8W-50
Dome Lamp.......................... 8W-44
Driver Airbag......................... 8W-43
Driver Cylinder Lock Switch............. 8W-39
Driver Door Ajar Switch................ 8W-45
Driver Door Lock Motor................. 8W-61
Driver Door Window/Lock Switch...... 8W-60, 61
Driver Heated Seat Cushion............. 8W-63Component Page
Driver Heated Seat Switch.............. 8W-63
Driver Lumbar Motor.................. 8W-63
Driver Power Seat Front Vertical Motor.... 8W-63
Driver Power Seat Horizontal Motor....... 8W-63
Driver Power Seat Rear Vertical Motor..... 8W-63
Driver Power Seat Switch............... 8W-63
Driver Power Window Motor............. 8W-60
Electric Brake Provision................ 8W-54
Engine Control Module................. 8W-30
Engine Coolant Temperature Sensor....... 8W-30
Engine Oil Pressure Sensor.............. 8W-30
Engine Starter Motor Relay.............. 8W-21
Engine Starter Motor................... 8W-21
EVAP/Purge Solenoid................... 8W-30
Fender Lamp......................... 8W-51
Fog Lamp Relay....................... 8W-50
Fog Lamp............................ 8W-50
Fuel Heater Relay..................... 8W-30
Fuel Heater........................ 8W-30-36
Fuel Injection Pump................... 8W-30
Fuel Injectors......................... 8W-30
Fuel Pump Module.................... 8W-30
Fuel Pump Relay...................... 8W-30
Fuel Tank Module..................... 8W-30
Fuel Transfer Pump.................... 8W-30
Fuses (JB)........................... 8W-12
Fuses (PDC).......................... 8W-10
Fusible Link....................... 8W-20, 30
Grounds............................. 8W-15
Generator............................ 8W-20
Glove Box Lamp And Switch............. 8W-44
Headlamp Beam Select Switch........... 8W-50
Headlamp Switch...................... 8W-50
Headlamp........................... 8W-50
Heated Mirror Relay................... 8W-62
Heated Mirror Switch.................. 8W-62
Heated Seat Relay..................... 8W-12
High Note Horn....................... 8W-41
Horn Relay.......................... 8W-41
Horn Switch.......................... 8W-41
Idle Air Control Motor.................. 8W-30
Ignition Coils......................... 8W-30
Ignition Switch....................... 8W-10
Instrument Cluster.................... 8W-40
Intake Air Heater Relays................ 8W-30
Intake Air Heater..................... 8W-30
Intake Air Temperature Sensor........... 8W-30
Intermittent Wiper Switch............... 8W-53
Joint Connectors....... 8W-10, 12, 15, 30, 34, 35,
40, 44, 45, 51, 53, 54, 70
Junction Block........................ 8W-12
Leak Detection Pump.................. 8W-30
BR/BE8W-02 COMPONENT INDEX 8W - 02 - 1

8W-10 POWER DISTRIBUTION
Component Page
A/C Compressor Clutch................ 8W-10-27
A/C Compressor Clutch Relay......... 8W-10-9, 27
Aftermarket Center High Mounted Stop
Lamp........................... 8W-10-13
Aftermarket Trailer Tow Connector....... 8W-10-21
Automatic Shut Down Relay.......... 8W-10-14, 20
Auxiliary Battery..................... 8W-10-8
Battery............................. 8W-10-8
Blower Motor....................... 8W-10-23
Blower Motor Relay................. 8W-10-8, 23
Brake Lamp Switch................. 8W-10-8, 13
Capacitor.......................... 8W-10-16
Center High Mounted Stop Lamp No. 1.... 8W-10-13
Center High Mounted Stop Lamp No. 2.... 8W-10-13
Central Timer Module.............. 8W-10-22, 26
Circuit Breaker 2.................... 8W-10-10
Clockspring......................... 8W-10-26
Combination Flasher.................. 8W-10-13
Controller Antilock Brake.............. 8W-10-23
Daytime Running Lamp Module......... 8W-10-25
Electric Brake Provision............. 8W-10-13, 21
Engine Control Module................ 8W-10-12
Engine Starter Motor................. 8W-10-23
Engine Starter Motor Relay........... 8W-10-8, 23
Fog Lamp Relay..................... 8W-10-25
Fuel Heater........................ 8W-10-20
Fuel Heater Relay.................. 8W-10-8, 20
Fuel Injection Pump.................. 8W-10-12
Fuel Injector No. 1................. 8W-10-15, 16
Fuel Injector No. 2................. 8W-10-15, 16
Fuel Injector No. 3................. 8W-10-15, 16
Fuel Injector No. 4................. 8W-10-15, 16
Fuel Injector No. 5................. 8W-10-15, 16
Fuel Injector No. 6................. 8W-10-15, 16
Fuel Injector No. 7................. 8W-10-15, 16
Fuel Injector No. 8................. 8W-10-15, 16
Fuel Injector No. 9................... 8W-10-16
Fuel Injector No. 10................... 8W-10-16
Fuel Pump Module................... 8W-10-11
Fuel Pump Relay.................. 8W-10-11, 12
Fuse 1 (JB)......................... 8W-10-10
Fuse 1 (PDC)...................... 8W-10-8, 10
Fuse 2 (PDC)................... 8W-10-8, 10, 22
Fuse 3 (PDC)................... 8W-10-8, 11, 12
Fuse 4 (JB)......................... 8W-10-10
Fuse 4 (PDC)...................... 8W-10-8, 13
Fuse 5 (PDC)...................... 8W-10-8, 13
Fuse 6 (PDC)................... 8W-10-8, 14, 20
Fuse 7 (PDC)...................... 8W-10-8, 20
Fuse 8 (PDC)...................... 8W-10-8, 21
Fuse 9 (PDC)...................... 8W-10-8, 23
Fuse 10 (PDC)..................... 8W-10-8, 22
Fuse 11 (PDC)..................... 8W-10-8, 23
Fuse 12 (JB)........................ 8W-10-10
Fuse 12 (PDC)................... 8W-10-8, 9, 23
Fuse 13 (JB)........................ 8W-10-10
Component Page
Fuse 14 (JB)........................ 8W-10-10
Fuse B (PDC)................... 8W-10-8, 9, 24
Fuse C (PDC)..................... 8W-10-9, 24
Fuse E (PDC)..................... 8W-10-9, 24
Fuse F (PDC)..................... 8W-10-9, 24
Fuse G (PDC)..................... 8W-10-9, 25
Fuse H (PDC)..................... 8W-10-9, 26
Fuse I (PDC)...................... 8W-10-9, 26
Fuse J (PDC)...................... 8W-10-9, 27
Fuse K (PDC)............. 8W-10-9, 14, 17, 18, 19
Fuse L (PDC)..................... 8W-10-9, 27
Fuse Gen (PDC)................... 8W-10-8, 27
G201............................. 8W-10-22
Generator........................ 8W-10-8, 27
Headlamp Beam Select Switch........... 8W-10-25
Headlamp Switch.................. 8W-10-9, 24
High Note Horn..................... 8W-10-26
Horn Relay....................... 8W-10-9, 26
Ignition Coil........................ 8W-10-15
Ignition Coil 4 Pack................... 8W-10-16
Ignition Coil 6 Pack................... 8W-10-16
Ignition Switch................. 8W-10-8, 10, 22
Joint Connector No. 1.............. 8W-10-25, 26
Joint Connector No. 2........ 8W-10-8, 9, 11, 12, 14,
15, 16, 20, 21
Joint Connector No. 5................. 8W-10-22
Joint Connector No. 6............ 8W-10-13, 22, 26
Joint Connector No. 8................. 8W-10-22
Junction Block.................. 8W-10-8, 10, 13
Left Fog Lamp...................... 8W-10-25
Left Headlamp...................... 8W-10-24
Left Outboard Headlamp.......... 8W-10-9, 24, 25
Low Note Horn...................... 8W-10-26
Oxygen Sensor 1/1 Left Bank Up . . . 8W-10-17, 18, 19
Oxygen Sensor 1/1 Upstream............ 8W-10-17
Oxygen Sensor 1/2 Downstream.......... 8W-10-17
Oxygen Sensor 1/2 Left Bank Down....... 8W-10-19
Oxygen Sensor 1/2 Pre-Catalyst.......... 8W-10-18
Oxygen Sensor 1/3 Post-Catalyst......... 8W-10-18
Oxygen Sensor 2/1 Right Bank Up . . 8W-10-17, 18, 19
Oxygen Sensor 2/2 Right Bank Down...... 8W-10-19
Oxygen Sensor Downstream Relay..... 8W-10-18, 19
Power Distribution Center.... 8W-10-8, 9, 10, 11, 12,
13, 14, 2, 20, 21, 22, 23, 24, 25, 26, 27
Power Outlet...................... 8W-10-9, 27
Powertrain Control Module . . 8W-10-11, 12, 15, 16, 20
Quad High Beam Relay................ 8W-10-24
Right Fog Lamp..................... 8W-10-25
Right Headlamp..................... 8W-10-24
Right Outboard Headlamp......... 8W-10-9, 24, 25
Security Relay..................... 8W-10-9, 25
Trailer Tow Connector................. 8W-10-21
Trailer Tow Relay.................... 8W-10-21
Transmission Control Relay........... 8W-10-9, 26
Transmission Solenoid Assembly......... 8W-10-26
Turn Signal/Hazard Switch............. 8W-10-13
BR/BE8W-10 POWER DISTRIBUTION 8W - 10 - 1

8W-12 JUNCTION BLOCK
Component Page
A/C Compressor Clutch Relay.......... 8W-12-13
A/C Heater Temperature Select......... 8W-12-8
A/C-Heater Control................... 8W-12-9
Airbag Control Module............... 8W-12-17
Ambient Temperature Sensor.......... 8W-12-19
Ash Receiver Lamp................... 8W-12-9
Automatic Day/Night Mirror..... 8W-12-13, 15, 21
Back-Up Lamp Switch............. 8W-12-11, 21
Blend Door Actuator.................. 8W-12-8
Blower Motor Relay.................. 8W-12-8
Cargo Lamp No. 1................... 8W-12-14
Cargo Lamp No. 2................... 8W-12-14
Central Timer Module........ 8W-12-8, 10, 13, 15
Cigar Lighter...................... 8W-12-16
Circuit Breaker 1.................. 8W-12-6, 7
Circuit Breaker 2.................... 8W-12-7
Combination Flasher......... 8W-12-6, 12, 15, 20
Controller Antilock Brake.............. 8W-12-8
Cup Holder Lamp.................... 8W-12-9
Data Link Connector................. 8W-12-14
Daytime Running Lamp Module........ 8W-12-11
Dome Lamp....................... 8W-12-14
Driver Door Window/Lock Switch..... 8W-12-7, 15
Driver Heated Seat Switch........... 8W-12-8, 9
Driver Power Seat Switch.............. 8W-12-7
Engine Control Module............... 8W-12-12
EVAP/Purge Solenoid................ 8W-12-13
Fuel Heater Relay................... 8W-12-13
Fuel Pump Relay................... 8W-12-12
Fuse 1 (JB)......................... 8W-12-8
Fuse 1 (PDC)...................... 8W-12-16
Fuse 2 (JB)....................... 8W-12-6, 8
Fuse 3 (JB)....................... 8W-12-6, 8
Fuse 4 (JB)........................ 8W-12-10
Fuse 4 (PDC)...................... 8W-12-20
Fuse 5 (JB)......................... 8W-12-9
Fuse 6 (JB)...................... 8W-12-6, 10
Fuse 7 (JB)...................... 8W-12-6, 11
Fuse 8 (JB)...................... 8W-12-6, 11
Fuse 9 (JB)...................... 8W-12-6, 11
Fuse 10 (JB).................. 8W-12-6, 12, 20
Fuse 11 (JB)..................... 8W-12-6, 13
Fuse 12 (JB)....................... 8W-12-14
Fuse 13 (JB)....................... 8W-12-15Component Page
Fuse 14 (JB)....................... 8W-12-16
Fuse 15 (JB)..................... 8W-12-6, 16
Fuse 16 (JB)..................... 8W-12-6, 16
Fuse 17 (JB)..................... 8W-12-6, 17
Fuse 18 (JB)..................... 8W-12-6, 17
Fuse 19 (JB)..................... 8W-12-6, 17
G100............................. 8W-12-18
G200.......................... 8W-12-15, 19
G201....................... 8W-12-15, 18, 20
Glove Box Lamp And Switch........... 8W-12-14
Headlamp Switch.................... 8W-12-9
Heated Mirror Switch................. 8W-12-8
Heated Seat Relay................... 8W-12-8
Ignition Switch................... 8W-12-6, 20
Instrument Cluster.......... 8W-12-9, 16, 17, 18
Intermittent Wiper Switch............ 8W-12-10
Joint Connector No. 1............. 8W-12-11, 21
Joint Connector No. 5.............. 8W-12-9, 14
Joint Connector No. 6................ 8W-12-10
Joint Connector No. 8............ 8W-12-8, 9, 17
Junction Block...... 8W-12-2, 3, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 21
Left Park/Turn Signal Lamp........... 8W-12-18
Left Visor/Vanity Lamp............ 8W-12-14, 15
Overhead Console.......... 8W-12-13, 14, 19, 21
Park/Neutral Position Switch....... 8W-12-11, 21
Passenger Airbag On/Off Switch........ 8W-12-17
Passenger Door Window/Lock Switch . . 8W-12-7, 15
Passenger Heated Seat Switch........ 8W-12-8, 9
Passenger Power Seat Switch........... 8W-12-7
Power Distribution Center......... 8W-12-16, 20
Power Mirror Switch.............. 8W-12-14, 21
Powertrain Control Module............ 8W-12-12
Radio........................ 8W-12-9, 11, 14
Radio Choke Relay.................. 8W-12-10
Right Park/Turn Signal Lamp.......... 8W-12-18
Right Visor/Vanity Lamp........... 8W-12-14, 15
Seat Heat Interface Module............ 8W-12-8
Turn Signal/Hazard Switch......... 8W-12-18, 20
Underhood Lamp................... 8W-12-14
Windshield Washer Pump............. 8W-12-10
Wiper Motor....................... 8W-12-10
Wiper Motor Relay.................. 8W-12-10
BR/BE8W-12 JUNCTION BLOCK 8W - 12 - 1

8W-15 GROUND DISTRIBUTION
Component Page
A/C Compressor Clutch.................8W-15-8, 10
A/C Heater Temperature Select.............8W-15-12
A/C-Heater Control.....................8W-15-14
Aftermarket Trailer Tow Connector............8W-15-6
Airbag Control Module....................8W-15-5
Ash Receiver Lamp.....................8W-15-14
Automatic Day/Night Mirror...............8W-15-13
Auxiliary Battery.......................8W-15-11
Battery.............................8W-15-11
Blend Door Actuator.....................8W-15-12
Blower Motor Relay......................8W-15-2
Brake Lamp Switch.....................8W-15-12
Brake Pressure Switch....................8W-15-3
Center High Mounted Stop Lamp No. 1........8W-15-17
Center High Mounted Stop Lamp No. 2........8W-15-17
Center Identification Lamp................8W-15-18
Central Timer Module.................8W-15-12, 13
Cigar Lighter.........................8W-15-14
Clockspring...........................8W-15-4
Combination Flasher....................8W-15-13
Controller Antilock Brake..................8W-15-5
Cummins Bus.........................8W-15-10
Cup Holder Lamp......................8W-15-14
Data Link Connector................8W-15-8, 10, 12
Daytime Running Lamp Module............8W-15-2, 3
Driver Cylinder Lock Switch...............8W-15-16
Driver Door Ajar Switch..................8W-15-16
Driver Door Window/Lock Switch..........8W-15-16, 17
Driver Heated Seat Cushion...............8W-15-15
Driver Heated Seat Switch................8W-15-13
Driver Power Seat Switch..............8W-15-15, 17
Electric Brake Provision..................8W-15-14
Engine Control Module....................8W-15-9
Engine Starter Motor Relay...............8W-15-8, 9
Fuel Heater..........................8W-15-10
Fuel Heater Relay.......................8W-15-2
Fuel Injection Pump.....................8W-15-9
Fuel Pump Module......................8W-15-7
Fuel Pump Relay.......................8W-15-2
Fuel Transfer Pump.....................8W-15-10
G100......................8W-15-2, 3, 4, 5, 7, 12
G101...............................8W-15-5
G102...............................8W-15-2
G105...............................8W-15-8
G107...............................8W-15-10
G113...............................8W-15-11
G114...............................8W-15-11
G115...............................8W-15-11
G116...............................8W-15-11
G117...............................8W-15-11
G118...............................8W-15-11
G120...............................8W-15-11
G200...........................8W-15-7, 12, 14
G201..........................8W-15-12, 13, 14
G300..........................8W-15-15, 16, 17
G301...............................8W-15-17
G302...............................8W-15-18
Glove Box Lamp And Switch...............8W-15-14
Headlamp Beam Select Switch..............8W-15-14
Headlamp Switch....................8W-15-13, 14
Heated Mirror Switch....................8W-15-13
High Note Horn........................8W-15-7
Ignition Switch........................8W-15-13
Instrument Cluster...................8W-15-12, 14
Component Page
Intake Air Heater Relay No. 1...............8W-15-9
Intake Air Heater Relay No. 2...............8W-15-9
Joint Connector No. 1...................8W-15-2, 5
Joint Connector No. 2....................8W-15-9
Joint Connector No. 5.................8W-15-13, 14
Joint Connector No. 6...................8W-15-4, 5
Joint Connector No. 8..................8W-15-5, 13
Junction Block...................8W-15-12, 13, 14
Left Back-Up Lamp......................8W-15-6
Left Front Door Speaker...................8W-15-4
Left Front Fender Lamp...................8W-15-6
Left License Lamp.......................8W-15-6
Left Outboard Clearance Lamp.............8W-15-18
Left Outboard Identification Lamp...........8W-15-18
Left Park/Turn Signal Lamp................8W-15-3
Left Power Mirror......................8W-15-16
Left Rear Fender Lamp...................8W-15-6
Left Remote Radio Switch..................8W-15-4
Left Tail/Stop/Turn Signal Lamp.............8W-15-6
Left Visor/Vanity Lamp...................8W-15-13
Low Note Horn.........................8W-15-7
Overdrive Switch.......................8W-15-12
Overhead Console......................8W-15-12
Oxygen Sensor 1/2 Left Bank Down...........8W-15-8
Oxygen Sensor 1/2 Pre-Catalyst..............8W-15-8
Oxygen Sensor 1/3 Post-Catalyst.............8W-15-8
Oxygen Sensor 2/2 Right Bank Down..........8W-15-8
Passenger Airbag On/Off Switch..............8W-15-5
Passenger Cylinder Lock Switch.............8W-15-16
Passenger Door Ajar Switch................8W-15-16
Passenger Door Window/Lock Switch..........8W-15-16
Passenger Heated Seat Cushion.............8W-15-15
Passenger Heated Seat Switch..............8W-15-13
Passenger Power Seat Switch..............8W-15-15
Power Distribution Center.................8W-15-2
Power Mirror Switch....................8W-15-16
Power Outlet.........................8W-15-14
Powertrain Control Module..............8W-15-8, 10
Quad High Beam Relay...................8W-15-2
Radio...............................8W-15-5
Radio Choke Relay......................8W-15-4
Right Back-Up Lamp.....................8W-15-6
Right Front Door Speaker..................8W-15-4
Right Front Fender Lamp..................8W-15-6
Right License Lamp......................8W-15-6
Right Outboard Clearance Lamp............8W-15-18
Right Outboard Identification Lamp..........8W-15-18
Right Park/Turn Signal Lamp...............8W-15-7
Right Power Mirror.....................8W-15-16
Right Rear Fender Lamp..................8W-15-6
Right Remote Radio Switch.................8W-15-4
Right Tail/Stop/Turn Signal Lamp............8W-15-6
Right Visor/Vanity Lamp..................8W-15-13
Seat Belt Switch.....................8W-15-15, 17
Seat Heat Interface Module................8W-15-15
Security Relay.........................8W-15-2
Speed Control Servo.....................8W-15-3
Tailgate Lamp.........................8W-15-6
Trailer Tow Connector....................8W-15-6
Trailer Tow Relay.......................8W-15-2
Underhood Lamp.......................8W-15-3
Washer Fluid Level Switch.................8W-15-3
Windshield Washer Pump..................8W-15-7
Wiper Motor...........................8W-15-7
BR/BE8W-15 GROUND DISTRIBUTION 8W - 15 - 1

8W-30 FUEL/IGNITION SYSTEM
Component Page
A/C Compressor Clutch Relay.... 8W-30-14, 38, 39
A/C High Pressure Switch.......... 8W-30-14, 39
A/C Low Pressure Switch.......... 8W-30-14, 39
A/C-Heater Control............... 8W-30-14, 39
Accelerator Pedal Position Sensor....... 8W-30-30
Airbag Control Module............ 8W-30-15, 40
Automatic Shut Down Relay..... 8W-30-3, 17, 18,
19, 22, 23, 24, 25, 26, 27, 28
Battery........................... 8W-30-35
Battery Temperature Sensor............ 8W-30-4
Brake Lamp Switch.............. 8W-30-8, 7, 37
Camshaft Position Sensor........... 8W-30-5, 32
Capacitor......................... 8W-30-28
Central Timer Module............. 8W-30-15, 40
Clockspring...................... 8W-30-7, 34
Controller Antilock Brake.... 8W-30-13, 15, 38, 40
Crankshaft Position Sensor............ 8W-30-13
Cummins Bus...................... 8W-30-29
Data Link Connector...... 8W-30-2, 15, 16, 40, 41
Daytime Running Lamp Module........ 8W-30-38
Engine Control Module . . 8W-30-3, 7, 29, 30, 31, 32,
33, 34, 35, 36, 37, 38, 39, 40, 41
Engine Coolant Temperature Sensor . . . 8W-30-9, 34
Engine Oil Pressure Sensor......... 8W-30-13, 33
EVAP/Purge Solenoid................ 8W-30-13
Fuel Heater........................ 8W-30-36
Fuel Heater Relay................... 8W-30-36
Fuel Injection Pump.............. 8W-30-31, 37
Fuel Injector No. 1............... 8W-30-23, 26
Fuel Injector No. 2............... 8W-30-24, 27
Fuel Injector No. 3............... 8W-30-23, 26
Fuel Injector No. 4............... 8W-30-24, 27
Fuel Injector No. 5............... 8W-30-23, 26
Fuel Injector No. 6............... 8W-30-24, 27
Fuel Injector No. 7............... 8W-30-23, 26
Fuel Injector No. 8............... 8W-30-24, 27
Fuel Injector No. 9.................. 8W-30-26
Fuel Injector No. 10................. 8W-30-27
Fuel Pump Module.................. 8W-30-12
Fuel Pump Relay......... 8W-30-3, 11, 12, 31, 37
Fuel Tank Module................... 8W-30-42
Fuel Transfer Pump................. 8W-30-34
Fuse 3 (PDC)............... 8W-30-2, 11, 29, 37
Fuse 6 (PDC)....................... 8W-30-3
Fuse 7 (PDC)...................... 8W-30-36
Fuse 9 (JB)................. 8W-30-2, 3, 11, 36
Fuse 11 (JB)................. 8W-30-13, 36, 39
Fuse 12 (JB).................... 8W-30-16, 41
Fuse K (PDC)........... 8W-30-17, 18, 19, 20, 22
Fusible Link....................... 8W-30-35
G100............................. 8W-30-12
G102.......................... 8W-30-36, 37Component Page
G105..................... 8W-30-2, 16, 20, 21
G107.......................... 8W-30-34, 36
G113 .......................... 8W-30-14, 34
G200.......................... 8W-30-16, 37
Generator...................... 8W-30-13, 38
Idle Air Control Motor................ 8W-30-9
Ignition Coil....................... 8W-30-25
Ignition Coil 4 Pack................. 8W-30-28
Ignition Coil 6 Pack................. 8W-30-28
Instrument Cluster............ 8W-30-15, 34, 40
Intake Air Heater................... 8W-30-35
Intake Air Heater Relay No. 1......... 8W-30-35
Intake Air Heater Relay No. 2......... 8W-30-35
Intake Air Temperature Sensor...... 8W-30-10, 32
Joint Connector No. 1....... 8W-30-4, 7, 8, 12, 36,
37, 38, 42
Joint Connector No. 2 . . . 8W-30-2, 3, 11, 17, 18, 19,
22, 23, 24, 25, 26, 27, 28, 29, 35, 37
Joint Connector No. 5............. 8W-30-16, 41
Joint Connector No. 7............. 8W-30-15, 40
Junction Block . . . 8W-30-2, 3, 11, 13, 16, 36, 39, 41
Leak Detection Pump................. 8W-30-8
Left Speed Control Switch............. 8W-30-7
Manifold Absolute Pressure Sensor . . . 8W-30-10, 33
Output Speed Sensor................. 8W-30-5
Overdrive Switch.................... 8W-30-6
Overhead Console................ 8W-30-15, 40
Oxygen Sensor 1/1 Left Bank Up.... 8W-30-18, 20,
21, 22
Oxygen Sensor 1/1 Upstream.......... 8W-30-17
Oxygen Sensor 1/2 Downstream........ 8W-30-17
Oxygen Sensor 1/2 Left Bank Down..... 8W-30-20
Oxygen Sensor 1/2 Pre- Catalyst........ 8W-30-21
Oxygen Sensor 1/3 Post- Catalyst....... 8W-30-21
Oxygen Sensor 2/1 Right Bank Up . . . 8W-30-18, 20,
21, 22
Oxygen Sensor 2/2 Right Bank Down.... 8W-30-20
Oxygen Sensor Downstream Relay . . . 8W-30-19, 21
Park/Neutral Position Switch....... 8W-30-13, 38
Power Distribution Center . . 8W-30-2, 3, 11, 17, 18,
19, 22, 23, 24, 25, 26, 27, 28, 29, 36, 37
Powertrain Control Module . . 8W-30-2, 3, 4, 5, 6, 7,
10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, 26, 27, 28, 36, 37, 38, 39, 40, 41, 42
PTO Switch..................... 8W-30-14, 34
Radio.......................... 8W-30-15, 40
Right Speed Control Switch............ 8W-30-7
Speed Control Servo.................. 8W-30-5
Throttle Position Sensor.............. 8W-30-14
Transmission Control Relay............ 8W-30-5
Transmission Solenoid Assembly . . . 8W-30-6, 14, 39
Water In Fuel Sensor................ 8W-30-34
BR/BE8W-30 FUEL/IGNITION SYSTEM 8W - 30 - 1