Jeep Liberty KJ. Manual — part 32
HEATED GLASS - ELECTRICAL DIAG
DIAGNOSIS AND TESTING
8G - 2
HEATED GLASS - ELECTRICAL DIAG
KJ
REAR DEFOGGER RELAY CONTROL CIRCUIT SHORT TO VOLTAGE
For a complete wiring diagram Refer to Section 8W.
KJ
HEATED GLASS - ELECTRICAL DIAG
8G - 3
•
When Monitored:
With the ignition on.
•
Set Condition:
When the BCM detects unwanted voltage on the rear window defogger control circuit.
Possible Causes
CODE ACTIVE
REAR DEFOGGER RELAY SHORTED
JUNCTION BLOCK - REAR DEFOGGER RELAY CONTROL CIRCUIT SHORT TO VOLTAGE
BODY CONTROL MODULE
Diagnostic Test
1.
CHECK TROUBLE CODE
Turn the ignition on.
With the scan tool, erase DTCs.
Attempt to operate the Rear Window Defogger.
With the scan tool, read DTCs.
Does the scan tool display REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT SHORT TO VOLT-
AGE?
Yes
>> Go To 2
No
>> Problem is intermittent and not present at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring and connectors and repair as necessary.
Perform BODY VERIFICATION TEST - VER 1.
2.
RELAY SHORTED
Remove the Rear Window Defogger Relay from the Junction Block.
Install a substitute relay in place of the Rear Window Defogger Relay.
With the scan tool, erase DTCs.
Attempt to operate the Rear Window Defogger.
With the scan tool, read DTCs.
Does the scan tool display REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT SHORT TO VOLT-
AGE?
Yes
>> Go To 3
No
>> Replace the original relay.
Perform BODY VERIFICATION TEST - VER 1.
8G - 4
HEATED GLASS - ELECTRICAL DIAG
KJ
3.
JUNCTION BLOCK - REAR WINDOW DEFOGGER RELAY CONTROL CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Remove the Rear Window Defogger Relay from the Junction Block.
Remove the Body Control Module from the Junction Block.
NOTE: Ensure the Junction Block connectors are reconnected at
this time.
Turn the ignition on.
Measure the voltage of the Rear Window Defogger Relay Control circuit
in the relay connector of the Junction Block.
Is there any voltage present?
Yes
>> Replace the Junction Block.
Perform BODY VERIFICATION TEST - VER 1.
No
>> Replace the Body Control Module.
Perform BODY VERIFICATION TEST - VER 1.
KJ
HEATED GLASS - ELECTRICAL DIAG
8G - 5
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