1999 DODGE RAM turn signal bulb


IN STR UM EN T P A N EL - A N ALO G

1999 D odge P ic ku p R 1500
1999 ACCESSORIES & EQUIPMENT
CHRY - Analog Instrument Panels
Ram Pickup, Ram Van & Ram Wagon
DESCRIPTION & OPERATION
INSTRUMENT CLUSTER
All instrument cluster gauges are air core magnetic type.
Tachometer is optional. All gauges use data transferred on Chrysler
Collision Detection (CCD) bus. Instrument cluster incorporates a
Vacuum Fluorescent Display (VFD) for odometer display.
Brake warning light illuminates when ignition is on and
parking brake is applied. Brake warning light also illuminates if
brake hydraulic system failure occurs during service brake
application. Brake warning light bulb test occurs when ignition switch
is in START position.
Oil pressure warning light illuminates when engine oil
pressure is not sufficient to open oil pressure sending unit switch.
Oil pressure warning light bulb test occurs with ignition switch in
RUN position.
All instrument clusters include these analog gauges:
* Coolant Temperature Gauge
* Fuel Gauge
* Oil Pressure Gauge
* Speedometer
* Voltmeter
Instrument clusters include these indicator lights, if
vehicle is equipped with appropriate option:
* Air Bag
* Anti-Lock Brake System (ABS)
* Brake Warning
* Check Gauges
* Cruise On
* Headlight High Beam
* Low Fuel
* Low Washer Fluid
* CHECK ENGINE
* Overdrive Off
* Rear Wheel Anti-Lock (RWAL)
* Seat Belt Reminder
* Security
* Transmission Oil Temperature (A/T)
* Turn Signal
* Upshift (M/T)
* 4WD
SELF-DIAGNOSTIC SYSTEM
WARNING: Vehicle is equipped with an air bag system. To prevent air
bag deployment, disconnect negative battery cable and wait at
least 2 minutes before servicing instrument cluster. See
appropriate AIR BAG RESTRAINT SYSTEMS article.
CAUTION: When battery is disconnected, vehicle computer and memory

   Use Scan Tool To Verify VSS

  Signal Is Sent By PCM 




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921 Not Receiving Distance Pulse  Check PCM Software Level; 

 Message From PCM  Use Scan Tool To Verify 

  Distance Pulse Message Is 

  Sent By PCM 




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940 Not Receiving Air Bag Light On Check CCD Bus Connections At

 Message From Air Bag Module  ACM; Check ACM Fuse 




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950 Not Receiving ABS Light On Message Check CCD Bus Connections 

From Anti-lock Brake Control ModuleAt Anti-Lock Control Module;

  Check Anti-Lock Control 

  Module Fuse 




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999 Undefined Error  Record Failure Message; 

  Press RESET Button To 

  Continue Self-Diagnostic 

  Test 










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2) If no DTCs appear, cluster will start a walking segment
test. First, all segments will be illuminated, then each segment in
sequence. If any segment does not illuminate, repeat test to confirm
and replace instrument cluster. When walking segment test is complete,
bulb check will start.
3) If any bulb does not light, remove instrument cluster and
check bulb and bulb holder. See INSTRUMENT CLUSTER under REMOVAL &
INSTALLATION. Ensure bulb holder is properly installed in cluster. If
bulb and bulb holder are okay, replace instrument cluster. If LED does
not light, replace instrument cluster. When bulb check is complete,
gauge actuator test will start.
4) Each gauge needle should stop at 3 calibration points,
then return to relaxed position. If any gauge does not perform as
specified, remove instrument cluster. See INSTRUMENT CLUSTER under
REMOVAL & INSTALLATION. Inspect all connections between printed
circuit board and gauge terminals, repair as necessary. If connections
are okay, replace instrument cluster. Instrument cluster will
automatically exit self-diagnostics when test is complete.

SYSTEM TESTS
NOTE: There are 2 instrument cluster connectors. These connectors
look identical. Identify connector by wire color. See WIRING
DIAGRAMS.
BRAKE WARNING LIGHT INOPERATIVE
1) Ensure parking brake is released. Turn ignition on. If
brake warning light stays on, check and repair hydraulic brake system
as necessary. See appropriate DISC & DRUM article in BRAKES section.
2) If brake warning light does not illuminate when ignition
is on, check fuse No. 17 (10-amp) on Ram Pickup or fuse No. 11 (10-
amp) on Ram Van and Ram Wagon in junction block. Junction block is
located at left end cover of instrument panel. If fuse is okay, go to
next step. If fuse is blown, locate and repair cause of blown fuse.
Install new fuse and recheck system operation.
3) Turn ignition on. Measure voltage between ground and power
side of fuse No. 17 on Ram Pickup or fuse No. 11 on Ram Van and Ram
Wagon. If battery voltage is present, go to next step. If battery
voltage is not present, locate and repair open circuit between to

STE ER IN G C O LU M N S W IT C HES
1999 D odge P ic ku p R 1500
1999 ACCESSORIES & EQUIPMENT
CHRY - Steering Column Switches
Dakota, Durango & Ram Pickup
WARNING: Deactivate air bag system before performing any service
operation involving steering column components. See
appropriate AIR BAG RESTRAINT SYSTEMS article. DO NOT apply
electrical power to any component on steering column without
first disconnecting air bag module. Air bag may deploy. Wait
at least 2 minutes after disconnecting negative battery cable
before servicing air bag system. System reserve capacitor,
integral to ACM, maintains air bag system voltage for about 2
minutes after battery is disconnected. Servicing air bag
system before 2-minute period may cause accidental air bag
deployment and possible personal injury.
DESCRIPTION
Turn signal, hazard flasher, headlight beam selector,
headlight flash-to-pass, windshield wipe, pulse wipe and windshield
wash systems use a common switch assembly (multifunction switch)
mounted within upper steering column housing.
Ignition switch and lock cylinder are incorporated into an
assembly attached to side of steering column. Ignition switch assembly
can be serviced as a separate unit, but requires removal of lock
cylinder.
COMPONENT LOCATIONS
COMPONENT LOCATIONS








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Component Location
Combination Flasher Relay ........................... Junction Block
Horn ............................... In Right Front Corner Of Engine
Compartment
Horn Relay ............................ In Power Distribution Center
Junction Block ................. Under Left Side Of Instrument Panel
Power Distribution Center ...... In Left Side Of Engine Compartment,
On Left Inner Panel
Relay/Flasher Module ........ Under Right Side Of Instrument Panel,
Behind Glove Box









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TROUBLE SHOOTING
TURN SIGNAL AND HAZARD FLASHER SYSTEM
Bulbs Burn Out Rapidly
Check charging system. See appropriate GENERATORS &
REGULATORS article in STARTING & CHARGING SYSTEMS.
Hazard Flashers Inoperative
Blown fuse. Faulty hazard flasher. Open circuit in feed wire
to hazard switch. Faulty turn signal/hazard switch. Open or grounded
circuit in wiring to external lights.

Hazard Warning Lights Okay To Front Lights Only
Faulty external bulbs. Faulty contact in turn signal/hazard
switch. Open circuit between hazard switch and turn signal switch.
Open or grounded circuit in wiring to rear lights.
Hazard Warning Lights Okay To Rear Lights Only
Faulty external bulbs. Faulty contact in turn signal/hazard
switch. Open or grounded circuit in wiring to front lights.
Indicator Light Inoperative, External Lights Okay
Burned-out indicator bulb in instrument cluster. Faulty
contact. Open circuit.
Indicator Light Okay, External Lights Inoperative
Open circuit in wiring to external light(s).
Indicator Light Okay, External Lights Glow Dimly Or Do Not
Flash
Loose or corroded external light connections. Poor ground
circuit at external light(s).
Turn Signals Do Not Cancel After Turn
Broken canceling pawl on turn signal switch. Improperly
aligned canceling cam. Broken or loose canceling cam.
Turn Signals Inoperative (Both Sides)
Blown fuse. Faulty turn signal flasher. Loose bulkhead
connector. Loose or faulty rear wiring harness or terminals. Open
circuit to turn signal flasher. Open circuit in feed wire to turn
signal switch. Faulty switch connections. Open or grounded circuit in
wiring to external lights.
Turn Signal Inoperative (One Side)
Faulty external bulb. Poor ground at external light. Open
circuit in wiring to external light(s). Faulty turn signal/hazard
switch.
COMPONENT TESTS
CAUTION: When battery is disconnected, vehicle computer and memory
systems may lose memory data. Driveability problems may exist
until computer systems have completed a relearn cycle. See
COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION
before disconnecting battery.
NOTE: For additional testing procedures, see appropriate CRUISE
CONTROL SYSTEMS and WIPER/WASHER SYSTEMS articles.
NOTE: For component locations, see COMPONENT LOCATIONS.
HORN RELAY
1) Remove horn relay from Power Distribution Center (PDC).
Use label on PDC cover to identify and locate relay. Check continuity
between relay terminals No. 87A and 30. See Fig. 1. If continuity does
not exist, replace relay. If continuity exists, go to next step.
2) Check continuity between relay terminals No. 30 and 87. If
continuity exists, replace relay. If continuity does not exist, check
resistance between relay terminals No. 85 and 86. If resistance is not
70-80 ohms, replace relay. If resistance is 70-80 ohms, go to next
step.
3) Using jumper wires, connect positive battery voltage to

switch connector. See Fig. 4. If continuity does not exist, repair
open Black/Red wire. If continuity exists, go to next step.
3) Check continuity between ground and Black/Red wire at
steering column horn switch connector. If continuity does not exist,
go to next step. If continuity exists, repair short to ground in
Black/Red wire.
4) Continuity between horn switch terminal and ground.
Continuity should exist with horn switch depressed. Continuity should
not exist without horn switch depressed. If continuity is not as
specified, replace horn switch. If continuity is as specified, install
horn relay and go to HORN under COMPONENT TESTS.
TURN SIGNAL & HAZARD WARNING SYSTEMS
1) If bulbs burn out rapidly, check charging system for
overcharging condition. See appropriate GENERATORS & REGULATORS
article in STARTING & CHARGING SYSTEMS. If charging system is okay, go
to next step. If charging system is not okay, repair as necessary.
2) If problem is turn signals failing to cancel after a turn,
inspect multifunction switch or cancelling cam lobes on clockspring
for damage or improper installation. If problem exists, repair as
necessary. If problem does not exist, go to next step.
3) Turn ignition on. Actuate turn signal switch or hazard
warning switch. Observe turn signal indicator light(s) in instrument
cluster. If flash rate is very high, check for a bulb that is not lit
or is dimly lit. Repair circuit or replace bulb as necessary. If turn
signals fail to light, go to next step.
4) Turn ignition off. Check turn signal fuse in junction
block and/or hazard warning fuse in PDC. If fuses are okay, go to next
step. If either fuse is blown, repair short circuit and replace fuse.
5) Check for battery voltage at hazard warning fuse in PDC.
Turn ignition on. Check for battery voltage at turn signal fuse in
junction block. If battery voltage exists, go to next step. If battery
voltage does not exist, repair open circuit to battery or ignition
switch as necessary.
6) Turn ignition off. Disconnect negative battery cable.
Remove combination flasher from junction block and replace with a
known good unit. Connect battery cable and test operation of turn
signal and hazard warning systems. If operation is okay, discard
faulty flasher. If operation is not okay, go to next step.
7) Turn ignition on. Check for battery voltage at combination
flasher terminals No. 51 and 48 in junction block. If battery voltage
exists, go to next step. If battery voltage does not exist, repair
open circuit to fuse in junction block or PDC as necessary.
8) Disconnect negative battery cable. Check continuity
between combination flasher terminal No. 50 and ground. If continuity
exists, go to next step. If continuity does not exist, repair open
ground circuit.
9) Disconnect multifunction switch harness connector. Check
continuity between junction block terminal No. 4 and multifunction
switch terminal No. 13 (Pink wire). If continuity exists, go to next
step. If continuity does not exist, repair open in Pink wire between
multifunction switch and junction block.
10) Check continuity between junction block terminal No. 13
and multifunction switch terminal No. 17 (Red/White wire). If
continuity exists, test multifunction switch. See MULTIFUNCTION SWITCH
under COMPONENT TESTS. If continuity does not exist, repair open in
Red/White wire between junction block and multifunction switch.
REMOVAL & INSTALLATION
WARNING: Deactivate air bag system before performing any service

Fig. 6: Locating Intake Manifold Air Heater Relays
Courtesy of Chrysler Corp.
Malfunction Indicator Light (MIL)
The MIL is located on the instrument panel, just below
tachometer and may also be referred to as the CHECK ENGINE light. MIL
comes on for a short period and then goes off as a bulb and wiring
circuit test each time ignition switch is turned to the ON position.
If Engine Control Module (ECM) receives an incorrect signal or
receives no signal from certain sensors or components, ECM will turn
on the MIL to warn the driver that a malfunction exists in the
electronic system.
Oil Pressure Gauge/Warning Light
Oil pressure gauge/warning light output from Engine Control
Module (ECM) to instrument cluster is routed on CCD Bus circuit.

WAIT-TO-START Warning Light
WAIT-TO-START warning light is located on instrument panel,
just below the speedometer. WAIT-TO-START warning light will come on
for a short period and then go off as a bulb and wiring circuit test
each time ignition switch is turned to the ON position. If Engine
Control Module (ECM) determines intake manifold air temperature is
less than 59
F (15C) by input signal received from intake manifold
air temperature sensor, ECM delivers output signal to operate WAIT-TO-
START warning light and intake manifold air heater for a preheat
cycle.
WAIT-TO-START warning light will remain on until intake
manifold air heater preheat cycle is complete. WAIT-TO-START warning
light will flash on and off if intake manifold air temperature sensor
signal to ECM is not within a specified value and Diagnostic Trouble
Code (FTC) will be stored in ECM memory.
WATER-IN-FUEL Warning Light
WATER-IN-FUEL warning light is located on instrument panel,
just below tachometer. WATER-IN-FUEL warning light will come on for a
short period and then go off as a bulb and wiring circuit test each
time ignition switch is turned to the ON position. If Engine Control
Module (ECM) determines water exists in fuel/water separator by input
signal from Water-In-Fuel (WIF) sensor, ECM will deliver output signal\
to turn on the WATER-IN-FUEL warning light.
ECM/PCM OUTPUT SIGNALS
A/C Clutch Relay
The Engine Control Module (ECM) controls A/C compressor
operation by controlling ground circuit for A/C clutch relay. ECM de-
energizes A/C clutch relay if engine coolant temperature is more than
257
F (125C). The A/C clutch relay is located in power distribution
center at driver's side front corner of engine compartment, near the
battery.
Automatic Shutdown (ASD) Relay
The Engine Control Module (ECM) controls ASD operation by
controlling ground circuit for ASD relay. ASD provides voltage to
operate generator field control for charging system. ASD relay is
located in power distribution center at driver's side front corner of
engine compartment, near the battery. Automatic Shutdown (ASD) relay
may also be referred to as Auto Shutdown (ASD) relay.
CCD Bus
These circuits are connected between Engine Control Module
(ECM) and Powertrain Control Module (PCM) to allow communication
between modules.
Cruise Control System
Engine Control Module (ECM) regulates cruise control system
operation by controlling vacuum at cruise control servo. Vacuum is
controlled by use of vacuum and vent solenoids in cruise control
servo.
Data Link Connector
Engine Control Module (ECM) provides output information at
Data Link Connector (DLC) when using scan tool to perform various
tests on the ECM and electronic control system. Data link connector is
a 16-pin connector located at lower edge of driver's side of
instrument panel, just above the accelerator pedal.
5-Volt Sensor Supply Output
Powertrain Control Module (PCM) supplies a 5-volt reference

signal to the transmission solenoid assembly for transmission
temperature sensor.
Generator Field
Engine Control Module (ECM) provides output signals to
generator field for regulating charging system voltage at 12.9-15.0
volts. ECM contains an internal electronic voltage regulator for
controlling the charging system voltage.
Generator Light
If Engine Control Module (ECM) senses a low charging system
condition, generator light on instrument panel (if equipped) will be
turned on. Generator light may also come on momentarily at low idle
speed when all accessories are on.
Malfunction Indicator Light (MIL)
The MIL is located on the instrument panel, just below
tachometer and may also be referred to as the CHECK ENGINE light. MIL
comes on for a short period and then goes off as a bulb and wiring
circuit test each time ignition switch is turned to the ON position.
If Engine Control Module (ECM) receives an incorrect signal or
receives no signal from certain sensors or components, ECM will turn
on the MIL to warn the driver that a malfunction exists in the
electronic system.
Overdrive Indicator Light (A/T Models)
Engine Control Module (ECM) delivers output signal to operate\
transmission overdrive indicator (O/D OFF) light in accordance with
position of the transmission overdrive switch. If overdrive is turned
off with transmission overdrive switch, transmission overdrive
indicator light will be turned on. Transmission overdrive indicator
light is located on instrument panel, just below the speedometer.
Tachometer
Engine Control Module (ECM) delivers output signal to operate\
tachometer on instrument panel to indicate engine RPM.
Transmission Overdrive Solenoid (A/T Models)
Engine Control Module (ECM) delivers output signal to
transmission overdrive solenoid for controlling transmission overdrive
shifts. Transmission overdrive solenoid is located on transmission
valve body.
Transmission Relay (A/T Models)
Transmission relay may be referred to as transmission control
relay or transmission 12-volt supply relay. Transmission relay ground
circuit is controlled by the Engine Control Module (ECM). When ground
circuit is completed, transmission relay supplies voltage to solenoid
assembly on the transmission. Transmission relay is located in power
distribution center at driver's side front corner of engine
compartment, near the battery.
Transmission Temperature Warning Light (A/T Models With
Heavy-Duty Transmission)
Engine Control Module (ECM) delivers output signal to turn on\
transmission temperature warning light if transmission fluid
temperature is determined to be greater than 280
F (138C) by the
transmission temperature sensor. Transmission temperature warning
light is located on instrument panel, just below the tachometer.
Transmission Torque Converter Clutch Solenoid (A/T Models)
Engine Control Module (ECM) delivers an output signal to
operate transmission torque converter clutch solenoid for torque