2002 JEEP LIBERTY Bus switch

LEFT REAR DOOR SPEAKER-2WAY
CAV CIRCUIT FUNCTION
1 X51 18BR/YL (BASE) LEFT REAR DOOR SPEAKER (+)
1 X93 18WT/RD (PREMIUM) AMPLIFIED LOW LEFT REAR SPEAKER (+)
2 X57 18BR/LB (BASE) LEFT REAR DOOR SPEAKER (-)
2 X91 18WT (PREMIUM) AMPLIFIED LOW LEFT REAR SPEAKER (-)
LEFT REAR POWER WINDOW MOTOR (MIDLINE/HIGHLINE) - LT. GRAY 2 WAY
CAV CIRCUIT FUNCTION
1 Q23 16DG LEFT REAR WINDOW DRIVER DOWN
2 Q13 16GY LEFT REAR WINDOW DRIVER UP
LEFT REMOTE RADIO SWITCH (PREMIUM) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 X10 20RD/DB RADIO CONTROL MUX RETURN
2 X20 20RD/BK RADIO CONTROL MUX
LEFT SIDE IMPACT AIRBAG CONTROL MODULE (LSIACM) - YELLOW 8 WAY
CAV CIRCUIT FUNCTION
1 F14 18LG/YL FUSED IGNITION SWITCH OUTPUT (RUN-START)
2- -
3 R77 18YL/RD LEFT CURTAIN SQUIB LINE 2
4 R75 18YL/BK LEFT CURTAIN SQUIB LINE 1
5 Z104 18BK/YL GROUND
6- -
7- -
8 D25 18YL/VT PCI BUS
KJ8W-80 CONNECTOR PIN-OUTS8Wa-80-75

POWERTRAIN CONTROL MODULE-C3 (GAS) - LT. GRAY 32 WAY
CAV CIRCUIT FUNCTION
26 K226 18DB/WT FUEL LEVEL SENSOR SIGNAL
27 D21 18PK SCI TRANSMIT
28 - -
29 D32 18LG SCI RECEIVE (PCM)
30 D25 18YL/VT PCI BUS
31 - -
32 V37 18RD/LG SPEED CONTROL SWITCH SIGNAL
RADIATOR FAN MOTOR - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 C25 12YL RADIATOR FAN RELAY OUTPUT
2 Z212 12BK/OR GROUND
RADIATOR FAN RELAY - BLACK 4 WAY
CAV CIRCUIT FUNCTION
1 C24 12DB/PK FUSED B(+)
2 C25 12YL RADIATOR FAN RELAY OUTPUT
3 Z212 18BK/OR GROUND
4 K173 18LG RADIATOR FAN RELAY CONTROL
RADIO C1 - GRAY 22 WAY
CAV CIRCUIT FUNCTION
1 M1 20PK FUSED B(+)
2 F89 18OR/RD FUSED IGNITION SWITCH OUTPUT (RUN-ACC)
3 E2 20OR FUSED PANEL LAMPS DIMMER SWITCH SIGNAL
4- -
5- -
6- -
7 X54 18VT RIGHT FRONT DOOR SPEAKER (+)
8 X56 18DB/RD RIGHT FRONT DOOR SPEAKER (-)
9 X55 18BR/RD LEFT FRONT DOOR SPEAKER (-)
10 X53 18DG LEFT FRONT DOOR SPEAKER (+)
11 Z9 16BK GROUND
12 M1 20PK FUSED B(+)
13 X16 18LG (PREMIUM) ANTENNA RELAY OUTPUT
14 D25 18YL/VT PCI BUS
15 - -
16 - -
17 - -
18 X51 18BR/YL LEFT REAR SPEAKER (+)
19 X57 18BR/LB LEFT REAR SPEAKER (-)
20 X58 18DB/OR RIGHT REAR SPEAKER (-)
21 X52 18DB/WT RIGHT REAR SPEAKER (+)
22 Z9 16BK GROUND
8Wa - 80 - 84 8W-80 CONNECTOR PIN-OUTSKJ

RADIO C2 - 10 WAY
CAV CIRCUIT FUNCTION
1 X40 20WT/RD AUDIO OUT RIGHT
2 Z30 20WT/BK GROUND
3 Z9 20BK/DB GROUND
4 D25 20YL/VT PCI BUS
5 X112 20RD IGNITION SWITCH OUTPUT
6 X41 20WT/DG AUDIO OUT LEFT
7 Z17 20BK GROUND
8- -
9- -
10 X160 20YL B(+)
RADIO C3-2WAY
CAV CIRCUIT FUNCTION
1 X30 BK RADIO ANTENNA CORE
2 X31 BK RADIO ANTENNA SHIELD
RADIO CHOKE (PREMIUM) - GRAY 4 WAY
CAV CIRCUIT FUNCTION
1 F60 16DG/RD FUSED B(+)
2 X13 16BK/RD RADIO CHOKE OUTPUT
3 X16 18LG ANTENNA RELAY OUTPUT
4 Z140 16BK/LG GROUND
REAR POWER OUTLET - RED 3 WAY
CAV CIRCUIT FUNCTION
1 F41 16PK/VT FUSED B(+)
2- -
3 Z151 16BK/WT GROUND
KJ8W-80 CONNECTOR PIN-OUTS8Wa-80-85

RIGHT SIDE IMPACT AIRBAG CONTROL MODULE (RSIACM) - YELLOW 8 WAY
CAV CIRCUIT FUNCTION
1 F14 18LG/YL FUSED IGNITION SWITCH OUTPUT (RUN-START)
2- -
3 R76 18YL/DB RIGHT CURTAIN SQUIB LINE 2
4 R74 18YL/BR RIGHT CURTAIN SQUIB LINE 1
5 Z100 18BK/YL GROUND
6- -
7- -
8 D25 18YL/VT PCI BUS
RIGHT SIDE MARKER LAMP (EXCEPT BUILT-UP-EXPORT) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 L78 18DG/YL FUSED PARK LAMP RELAY OUTPUT
2 L62 18BR/RD RIGHT TURN SIGNAL
RIGHT SIDE REPEATER LAMP (BUILT-UP-EXPORT) - BLACK 2 WAY
CAV CIRCUIT FUNCTION
1 L62 18BR/RD RIGHT TURN SIGNAL
2 Z142 18BK/WT GROUND
RIGHT SPEED CONTROL SWITCH (EXCEPT BASE) - BLACK 4 WAY
CAV CIRCUIT FUNCTION
1- -
2 K4 20BK/LB SENSOR GROUND
3 V37 20RD/LG SPEED CONTROL SWITCH SIGNAL
4- -
RIGHT TAIL/STOP LAMP - BLACK 6 WAY
CAV CIRCUIT FUNCTION
1 L38 18BR/WT (BUILT-UP-EXPORT) REAR FOG LAMP RELAY OUTPUT
2 L78 18DG/YL FUSED PARK LAMP RELAY OUTPUT
3 L50 18WT/TN BRAKE LAMP SWITCH OUTPUT
4 L10 18BR/LG BACK-UP LAMP FEED
5 Z151 18BK/WT GROUND
6 L62 18BR/RD RIGHT TURN SIGNAL
KJ8W-80 CONNECTOR PIN-OUTS8Wa-80-93

RIGHT VISOR/VANITY LAMP (EXCEPT BASE) - WHITE 2 WAY
CAV CIRCUIT FUNCTION
1 M1 20PK FUSED B(+)
2 M20 20BR COURTESY LAMP LOAD SHED
SENTRY KEY IMMOBILIZER MODULE (EXCEPT BASE) - BLACK 6 WAY
CAV CIRCUIT FUNCTION
1 F33 20PK/RD FUSED B(+)
2 Z11 20BK/WT GROUND
3 F1 20DB FUSED IGNITION SWITCH OUTPUT (RUN-START)
4 Z110 20BK/TN GROUND
5 D25 20YL/VT/BK PCI BUS
6- -
SHIFTER ASSEMBLY - WHITE 6 WAY
CAV CIRCUIT FUNCTION
1 E2 20OR FUSED PANEL LAMPS DIMMER SWITCH SIGNAL
2 Z21 20BK/LG GROUND
3 T6 20VT/WT OVERDRIVE OFF SWITCH SENSE
4 Z21 20BK/LG GROUND
5 F22 18DB/PK FUSED IGNITION SWITCH OUTPUT (RUN)
6 K29 20WT/PK BRAKE SWITCH SENSE
SIREN (BUILT-UP-EXPORT)-3WAY
CAV CIRCUIT FUNCTION
1 Z142 18BK/WT GROUND
2 X75 18DG SIREN SIGNAL CONTROL
3 M1 18PK FUSED B(+)
SPEED CONTROL SERVO - BLACK 4 WAY
CAV CIRCUIT FUNCTION
1 V36 18TN/RD SPEED CONTROL VACUUM SOLENOID CONTROL
2 V35 18LG/RD SPEED CONTROL VENT SOLENOID CONTROL
3 V30 18DB/RD SPEED CONTROL BRAKE SWITCH OUTPUT
4 Z212 18BK/OR GROUND
8Wa - 80 - 94 8W-80 CONNECTOR PIN-OUTSKJ

TRANSMISSION CONTROL MODULE (3.7L) - BLACK 60 WAY
CAV CIRCUIT FUNCTION
1 T1 18LG/BK TRS T1 SENSE
2 T4 18PK/OR TRS T2 SENSE
3 T3 18VT TRS T3 SENSE
4- -
5- -
6 K24 18GY/BK CRANKSHAFT POSITION SENSOR SIGNAL
7 D21 18PK SCI TRANSMIT
8 F45 18YL/BR FUSED IGNITION SWITCH OUTPUT (START)
9 T9 18OR/BK OVERDRIVE PRESSURE SWITCH SENSE
10 T10 18YL/DG TORQUE MANAGEMENT REQUEST SENSE
11 F1 18DB FUSED IGNITION SWITCH OUTPUT (RUN-START)
12 K22 18OR/DB THROTTLE POSITION SENSOR SIGNAL
13 T13 18DB/BK SPEED SENSOR GROUND
14 T14 18LG/WT OUTPUT SPEED SENSOR SIGNAL
15 K30 18PK TRANSMISSION CONTROL RELAY CONTROL
16 T16 14RD TRANSMISSION CONTROL RELAY OUTPUT
17 T16 14RD TRANSMISSION CONTROL RELAY OUTPUT
18 T591 18YL/DB PRESSURE CONTROL SOLENOID CONTROL
19 T119 18WT/DB 2C SOLENOID CONTROL
20 T20 18LB LOW/REVERSE SOLENOID CONTROL
21 - -
22 - -
23 - -
24 - -
25 - -
26 - -
27 - -
28 - -
29 T29 18GY UNDERDRIVE PRESSURE SWITCH SENSE
30 T38 18VT/TN LINE PRESSURE SENSOR SIGNAL
31 - -
32 - -
33 - -
34 - -
35 - -
36 T16 14RD TRANSMISSION CONTROL RELAY OUTPUT
37 Z113 14BK/YL GROUND
38 T39 18GY/LB 5 VOLT SUPPLY
39 Z113 14BK/YL GROUND
40 T140 18VT/LG MS SOLENOID CONTROL
41 T411 18WT/PK TRS T41 SENSE
42 T42 18VT/WT TRS T42 SENSE
43 D25 18VT/YL PCI BUS
44 - -
45 - -
46 D20 18LG SCI RECEIVE
47 T147 18LB 2C PRESSURE SWITCH SENSE
48 T48 18DB 4C PRESSURE SWITCH SENSE
49 T6 18OR/WT OVERDRIVE OFF SWITCH SENSE
50 T50 18DG LOW/REVERSE PRESSURE SWITCH SENSE
51 K4 18BK/LB SENSOR GROUND
52 T52 18RD/BK INPUT SPEED SENSOR SIGNAL
53 Z112 14BK GROUND
8Wa - 80 - 98 8W-80 CONNECTOR PIN-OUTSKJ

OIL PRESSURE SENSOR/
SWITCH
DESCRIPTION
The 3±wire, solid-state engine oil pressure sensor
(sending unit) is located in an engine oil pressure
gallery.
OPERATION
The oil pressure sensor uses three circuits. They
are:
²A 5±volt power supply from the Powertrain Con-
trol Module (PCM)
²A sensor ground through the PCM's sensor
return
²A signal to the PCM relating to engine oil pres-
sure
The oil pressure sensor has a 3±wire electrical
function very much like the Manifold Absolute Pres-
sure (MAP) sensor. Meaning different pressures
relate to different output voltages.
A 5±volt supply is sent to the sensor from the PCM
to power up the sensor. The sensor returns a voltage
signal back to the PCM relating to engine oil pres-
sure. This signal is then transferred (bussed) to the
instrument panel on either a CCD or PCI bus circuit
(depending on vehicle line) to operate the oil pressure
gauge and the check gauges lamp. Ground for the
sensor is provided by the PCM through a low-noise
sensor return.
REMOVAL
(1) Disconnect the negative cable from the battery.
(2) Raise vehicle on hoist.
(3) Remove front splash shield.
(4) Disconnect oil pressure sender wire (Fig. 78).
(5) Remove the pressure sender (Fig. 78).
INSTALLATION
(1) Install oil pressure sender.
(2) Connect oil pressure sender wire.
(3) Install front splash shield.
(4) Lower vehicle.
(5) Connect the negative battery cable.
OIL PUMP
REMOVAL
(1) Remove the oil pan and pick-up tube (Refer to
9 - ENGINE/LUBRICATION/OIL PAN - REMOVAL).
(2) Remove the timing chain cover (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT / CHAIN
COVER(S) - REMOVAL).
(3) Remove the timing chains and tensioners
(Refer to 9 - ENGINE/VALVE TIMING/TIMING
BELT/CHAIN AND SPROCKETS - REMOVAL).
(4) Remove the four bolts, primary timing chain
tensioner and the oil pump.
DISASSEMBLY
(1) Remove oil pump cover screws and lift off cover
plate.
(2) Remove pump inner and outer rotors.
NOTE: Once the oil pressure relief valve, cup plug,
and pin are removed, the pump assembly must be
replaced.
(3) If it is necessary to remove the pressure relief
valve, drive the roll pin from pump housing and
remove cup plug, spring and valve.
Fig. 78 Oil Pressure Sending Unit
1 - BELT
2 - OIL PRESSURE SENSOR
3 - OIL FILTER
4 - ELEC. CONNECTOR
KJENGINE - 3.7L 9 - 65

(6) Install oil pressure switch and connector. (Refer
to 9 - ENGINE/LUBRICATION/OIL PRESSURE
SENSOR/SWITCH - INSTALLATION)
OIL
STANDARD PROCEDURE
ENGINE OIL LEVEL CHECK
The best time to check engine oil level is after it
has sat overnight, or if the engine has been running,
allow the engine to be shut off for at least 5 minutes
before checking oil level.
Checking the oil while the vehicle is on level
ground will improve the accuracy of the oil level
reading. Remove dipstick and observe oil level. Add
oil only when the level is at or below the ADD mark
(Fig. 78).
STANDARD PROCEDURE - ENGINE OIL AND
FILTER CHANGE
Change engine oil at mileage and time intervals
described in the Maintenance Schedule. (Refer to
LUBRICATION & MAINTENANCE/MAINTE-
NANCE SCHEDULES - DESCRIPTION)
WARNING: NEW OR USED ENGINE OIL CAN BE
IRRITATING TO THE SKIN. AVOID PROLONGED OR
REPEATED SKIN CONTACT WITH ENGINE OIL.
CONTAMINANTS IN USED ENGINE OIL, CAUSED BY
INTERNAL COMBUSTION, CAN BE HAZARDOUS TO
YOUR HEALTH. THOROUGHLY WASH EXPOSED
SKIN WITH SOAP AND WATER. DO NOT WASH
SKIN WITH GASOLINE, DIESEL FUEL, THINNER, OR
SOLVENTS, HEALTH PROBLEMS CAN RESULT. DO
NOT POLLUTE, DISPOSE OF USED ENGINE OIL
PROPERLY. CONTACT YOUR DEALER OR GOVERN-
MENT AGENCY FOR LOCATION OF COLLECTION
CENTER IN YOUR AREA.
Run engine until achieving normal operating tem-
perature.
(1) Position the vehicle on a level surface and turn
engine off.(2) Hoist and support vehicle on safety stands.
Refer to Hoisting and Jacking Recommendations.
(Refer to LUBRICATION & MAINTENANCE/HOIST-
ING - STANDARD PROCEDURE)
(3) Remove oil fill cap.
(4) Place a suitable drain pan under crankcase
drain.
(5) Remove drain plug from crankcase and allow
oil to drain into pan. Inspect drain plug threads for
stretching or other damage. Replace drain plug and
gasket if damaged.
(6) Remove oil filter. (Refer to 9 - ENGINE/LUBRI-
CATION/OIL FILTER - REMOVAL)
(7) Install and tighten drain plug in crankcase.
(8) Install new oil filter. (Refer to 9 - ENGINE/LU-
BRICATION/OIL FILTER - INSTALLATION)
(9) Lower vehicle and fill crankcase with specified
type and amount of engine oil. (Refer to LUBRICA-
TION & MAINTENANCE/FLUID TYPES -
DESCRIPTION)
(10) Install oil fill cap.
(11) Start engine and inspect for leaks.
(12) Stop engine and inspect oil level.
NOTE: Care should be exercised when disposing
used engine oil after it has been drained from a
vehicle engine. Refer to the WARNING listed above.
OIL FILTER
DESCRIPTION
The engine oil filter is a high quality full-flow, dis-
posable type. Replace the oil filter with a Mopartor
the equivalent.
REMOVAL
(1) Raise vehicle on hoist.
(2) Position an oil collecting container under oil fil-
ter location.
CAUTION: When servicing the oil filter avoid
deforming the filter can by installing the remove/in-
stall tool band strap against the can to base lock
seam. The lock seam joining the can to the base is
reinforced by the base plate.
(3) Using a suitable filter wrench, turn oil filter
counterclockwise to remove (Fig. 79).
INSTALLATION
(1) Clean and check filter mounting surface. The
surface must be smooth, flat and free of debris or
pieces of gasket.
(2) Lubricate new oil filter gasket with clean
engine oil.
Fig. 78 Oil Level
1 - ENGINE OIL LEVEL DIPSTICK
KJENGINE9s-47
LUBRICATION (Continued)