Jeep Liberty KJ. Manual — part 125
3.
CHECK FOR OPEN (G78) TAILGATE 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 (G78) Tailgate 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 (G78) Tailgate Ajar Switch Sense circuit for an
open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
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LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
KJ
*TAILGATE AJAR CIRCUIT SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W.
KJ
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
8L - 159
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
(G78) TAILGATE AJAR SWITCH SENSE CIRCUIT SHORT TO GROUND
TAILGATE LOCK MOTOR/AJAR SWITCH
BODY CONTROL MODULE
Diagnostic Test
1.
CHECK FOR SHORTED TAILGATE AJAR SWITCH
With the scan tool in Data Display, read the TAILGATE AJAR SW state.
Disconnect the Tailgate Lock Motor/Ajar Switch connector.
Does the scan tool display TAILGATE AJAR SW: FALSE?
Yes
>> Replace the Tailgate 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 (G78) TAILGATE AJAR SWITCH SENSE CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Body Control Module C1 harness connector.
Turn the ignition on.
Using a 12–volt test light connected to 12–volts, test the (G78) Tailgate
Ajar Switch Sense circuit for a short to ground.
Does the test light illuminate brightly?
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 (G78) Tailgate Ajar Switch Sense circuit for a
short to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
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LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
KJ
*COURTESY LAMPS INOPERATIVE-ALL LAMPS
For a complete wiring diagram Refer to Section 8W
Possible Causes
JUNCTION BLOCK
COURTESY LAMPS DRIVER CIRCUIT OPEN
BODY CONTROL MODULE
Diagnostic Test
1.
JUNCTION BLOCK
Gain access to the junction block C24 Harness connector.
While back probing, measure the voltage of the Courtesy Lamp Driver circuit.
Is the voltage above 10.0 volts?
Yes
>> Go To 2
No
>> Replace the Junction Block.
Perform BODY VERIFICATION TEST - VER 1.
2.
COURTESY LAMP DRIVER CIRCUIT SHORTED TO VOLTAGE
Using a jumper wire, test the Courtesy Lamps Driver circuit to the Junction Block C24 connector and ground.
Do the courtesy lamps come on?
Yes
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Repair the Courtesy Lamp Driver circuit for an open condition.
Perform BODY VERIFICATION TEST - VER 1.
KJ
LAMPS/LIGHTING - INTERIOR - ELECTRICAL DIAGNOSTICS
8L - 161
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