Jeep Liberty KJ. Manual — part 123
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
(G74) RIGHT FRONT 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
NOTE: For the Right Front Door Ajar state the scan tool will read
“PASS” for RHD.
With the scan tool in Data Display, read the RIGHT FRONT DOOR
AJAR SW state.
Disconnect the Door Lock Motor/Ajar Switch connector.
Does the scan tool display RIGHT FRONT 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 (G74) RIGHT FRONT DOOR AJAR SWITCH SENSE CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Body Control Module C1 harness connector.
Measure the resistance between ground and the (G74) Right Front
Door Ajar Switch Sense circuit in the BCM C1 connector.
Is the resistance below 1000.0 ohms?
Yes
>> 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)
No
>> Repair the (G74) Right Front 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)
8L - 150
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
KJ
*RIGHT REAR DOOR AJAR CIRCUIT OPEN
For a complete wiring diagram Refer to Section 8W.
KJ
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
8L - 151
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
RIGHT REAR DOOR AJAR SWITCH GROUND CIRCUIT OPEN
(G76) RIGHT REAR DOOR AJAR SWITCH SENSE CIRCUIT OPEN
DOOR LOCK MOTOR/AJAR SWITCH
BODY CONTROL MODULE
Diagnostic Test
1.
OPEN RIGHT REAR DOOR AJAR SWITCH GROUND CIRCUIT
Disconnect the Right 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 RIGHT FRONT DOOR AJAR SWITCH
With the scan tool in Data Display, read the RIGHT REAR DOOR AJAR
SW state.
Connect a jumper wire between the Sense circuit and the Ground cir-
cuit.
Does the scan tool display RIGHT 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 - 152
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
KJ
3.
CHECK FOR OPEN (G76) RIGHT REAR DOOR AJAR SWITCH SENSE CIRCUIT
Turn the ignition off.
Leave the jumper wire from the previous step connected.
Disconnect the Body Control Module C1 harness connector.
Measure the resistance between ground and the (G76) Right Rear Door
Ajar Switch Sense circuit in the BCM C1 connector.
Is the resistance below 5.0 ohms?
Yes
>> 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)
No
>> Repair the (G76) Right 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 - 153
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