Jeep Liberty KJ. Manual — part 148
3.
CHECK THE JUNCTION BLOCK FOR THE DOOR UNLOCK RELAY CONTROL CIRCUIT SHORT TO
VOLTAGE
Turn the ignition off.
Remove the Door Unlock 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 between ground and the (P334) Door Unlock
Relay Control circuit in the relay connector of the Junction Block.
Is there any voltage present?
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
>> Replace the Junction Block.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
8N - 14
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
DRIVER DOOR UNLOCK RELAY CONTROL CIRCUIT OPEN OR SHORT TO
GROUND
KJ
POWER LOCKS - ELECTRICAL DIAGNOSTICS
8N - 15
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With ignition on.
•
Set Condition:
The BCM detects a low circuit on the Driver Door Unlock Relay Control circuit even though it is not attempting
to unlock 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 UNLOCK RELAY CONTROL SHORT TO GROUND
JUNCTION BLOCK - DOOR UNLOCK 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 DRIVER DOOR UNLOCK 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 Unlock Relay from the Junction Block.
Install a substitute relay in place of the Door Unlock 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 UNLOCK RELAY CONTROL
CIRCUIT 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 - 16
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
3.
CHECK THE JUNCTION BLOCK FOR THE (P109) DRIVER DOOR UNLOCK RELAY CONTROL CIRCUIT
SHORT TO GROUND
Turn the ignition off.
Remove the Door Unlock 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 (P109) Driver Door
Unlock 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 (P109) DRIVER DOOR UNLOCK RELAY CONTROL CIRCUIT
OPEN
Measure the resistance of the (P109) Driver Door Unlock Relay Control
circuit between the Relay connector and the Junction Block - BCM con-
nector.
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 - 17
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