Jeep Liberty KJ. Manual — part 145
POWER LOCKS - ELECTRICAL DIAGNOSTICS
DIAGNOSIS AND TESTING
8N - 2
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
DOOR LOCK RELAY CONTROL CIRCUIT OPEN OR SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W.
KJ
POWER LOCKS - ELECTRICAL DIAGNOSTICS
8N - 3
•
When Monitored:
With ignition on.
•
Set Condition:
The BCM detects a low circuit on the Door Lock Relay Control circuit even though it is not attempting to lock
the doors for more than 5 seconds. If the BCM is not grounding its side of the relay coil, the output should be
high.
Possible Causes
RELAY OPEN OR SHORTED
JUNCTION BLOCK - DOOR LOCK RELAY CONTROL SHORT TO GROUND
JUNCTION BLOCK - DOOR LOCK RELAY CONTROL OPEN
BODY CONTROL MODULE - OPEN OR SHORTED
Diagnostic Test
1.
CHECK TROUBLE CODE
NOTE: If the door locks are totally inoperative, check fuse No. 6 before proceeding.
Turn the ignition on.
With the scan tool, erase DTCs.
Operate the door locks several times.
With the scan tool, read DTCs.
Does the scan tool display DOOR LOCK RELAY CONTROL CIRCUIT OPEN OR SHORT TO GROUND?
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. Ensure the relay is completely plugged in.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
2.
CHECK FOR RELAY OPEN OR SHORTED
Turn the ignition off.
Remove the Door Lock Relay from the Junction Block.
Install a substitute relay in place of the Door Lock Relay.
Turn the ignition on.
With the scan tool, erase DTCs.
Operate the Door Locks several times.
With the scan tool, read DTCs.
Does the scan tool display DOOR LOCK RELAY CONTROL CIR-
CUIT OPEN/SHORT TO GROUND?
Yes
>> Go To 3
No
>> Replace the original relay.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
8N - 4
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
3.
CHECK THE JUNCTION BLOCK FOR THE DOOR LOCK RELAY CONTROL CIRCUIT SHORT TO GROUND
Turn the ignition off.
Remove the Door Lock 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.
Measure the resistance between ground and the (P333) Door Lock
Relay Control circuit in the relay connector of the Junction Block.
Is the resistance below 100.0 ohms?
Yes
>> Replace the Junction Block in accordance with service infor-
mation.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 4
4.
CHECK THE JUNCTION BLOCK FOR THE DOOR LOCK RELAY CONTROL CIRCUIT OPEN
Measure the resistance of the (P333) Door Lock Relay Control circuit
between the Relay connector and the Junction Block - BCM connector.
Is the resistance below 2.0 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
>> Replace the Junction Block.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
KJ
POWER LOCKS - ELECTRICAL DIAGNOSTICS
8N - 5
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