Jeep Liberty KJ. Manual — part 121
Theory of Operation
The scan tool will display the door state NOT the switch state. It will display as True/False. True states that the door
is ajar (open). False states that the door is NOT ajar (closed).
Possible Causes
LEFT REAR DOOR AJAR SWITCH GROUND CIRCUIT OPEN
(G77) LEFT REAR DOOR AJAR SWITCH SENSE CIRCUIT OPEN
DOOR LOCK MOTOR/AJAR SWITCH
BODY CONTROL MODULE
Diagnostic Test
1.
OPEN LEFT REAR DOOR AJAR SWITCH GROUND CIRCUIT
Disconnect the Left Rear Door Lock Motor/Ajar switch connector.
Using a 12-volt Test Light connected to 12-volts, test the Ground circuit.
Does the test light illuminate brightly?
Yes
>> Go To 2
No
>> Repair the Ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
2.
CHECK FOR OPEN LEFT FRONT DOOR AJAR SWITCH
With the scan tool in Data Display, read the LEFT REAR DOOR AJAR
SW state.
Connect a jumper wire between the Sense circuit and the Ground cir-
cuit.
Does the scan tool display LEFT REAR DOOR AJAR SW:
TRUE?
Yes
>> Replace the Door Lock Motor/Ajar Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 3
8L - 142
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
KJ
3.
CHECK FOR OPEN (G77) LEFT REAR DOOR AJAR SWITCH SENSE CIRCUIT
Turn the ignition off.
Leave the jumper wire from the previous step connected.
Disconnect the Body Control Module C2 harness connector.
Measure the resistance between ground and the (G77) Left Rear Door
Ajar Switch Sense circuit in the BCM C2 connector.
Is the resistance below 1000.0 ohms?
No
>> Replace the Body Control Module in accordance with ser-
vice information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
Yes
>> Repair the (G75) Left Front Door Ajar Switch Sense circuit
for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
KJ
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
8L - 143
*LEFT REAR DOOR AJAR CIRCUIT SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W.
8L - 144
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
KJ
Theory of Operation
The scan tool will display the door state NOT the switch state. It will display as True/False. True states that the door
is ajar (open). False states that the door is NOT ajar (closed).
Possible Causes
(G77) LEFT REAR DOOR AJAR SWITCH SENSE CIRCUIT SHORT TO GROUND
DOOR LOCK MOTOR/AJAR SWITCH
BODY CONTROL MODULE
Diagnostic Test
1.
CHECK FOR SHORTED DOOR AJAR SWITCH
With the scan tool in Data Display, read the LEFT REAR DOOR AJAR
SW state.
Disconnect the Door Lock Motor/Ajar Switch connector.
Does the scan tool display LEFT REAR DOOR AJAR SW:
FALSE?
Yes
>> Replace the Door Lock Motor/Ajar Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 2
2.
CHECK FOR (G77) LEFT REAR DOOR AJAR SWITCH SENSE CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Body Control Module C2 harness connector.
Measure the resistance between ground and the (G77) Left Rear Door
Ajar Switch Sense circuit in the BCM C2 connector.
Is the resistance below 1000.0 ohms?
No
>> Replace the Body Control Module in accordance with ser-
vice information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
Yes
>> Repair the (G77) Left Rear Door Ajar Switch Sense circuit
for a short to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
KJ
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
8L - 145
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