Jeep Liberty KJ. Manual — part 153
3.
CHECK JUNCTION BLOCK FOR A SHORT TO VOLTAGE
Turn the ignition off.
Remove the Body Control Module from the Junction Block.
NOTE: Ensure the Junction Block C1, C2 and C3 connectors are
connected at this time.
Turn the ignition on.
Measure the voltage between the (P30) Tailgate Lock Driver circuit in
the Junction Block - BCM connector and ground.
Measure the voltage between the (P31) Tailgate Unlock Driver circuit in
the Junction Block - BCM connector and ground.
Is there any voltage present on either circuit?
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 Body Control Module in accordance with ser-
vice information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
8N - 34
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
*ALL DOORS FAIL TO LOCK
For a complete wiring diagram Refer to Section 8W.
KJ
POWER LOCKS - ELECTRICAL DIAGNOSTICS
8N - 35
Possible Causes
KEY-IN IGNITION SWITCH SHORTED
(P33) DOOR LOCK RELAY OUTPUT CIRCUIT SHORT TO GROUND
DOOR LOCK RELAY
Diagnostic Test
1.
DTC’S PRESENT
With the scan tool, read DTCs.
Are there any Power Door Lock related codes present?
Yes
>> Refer to symptom list for problems related to POWER DOOR LOCKS/RKE.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
No
>> Go To 2
2.
CHECK KEY-IN IGNITION SWITCH – SHORTED
Close both front doors.
Insert the key in the ignition switch but do not turn the switch on.
Does the Chime continue to sound?
Yes
>> Refer to symptom list for problems related to CHIME.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
No
>> Go To 3
3.
CHECK DOOR LOCK RELAY OUTPUT CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Remove the Door Lock, the Door Unlock and the Driver Door Unlock
relays from the Junction Block.
Measure the resistance between ground and the (P33) Door Lock Relay
Output circuit in the Door Lock relay connector.
Is the resistance below 1000.0 ohms?
Yes
>> Repair the (P33) Door Lock Relay Output circuit for a short
to ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Replace the Door Lock Relay.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
8N - 36
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
*ALL PASSENGER DOORS FAIL TO LOCK AND UNLOCK
For a complete wiring diagram Refer to Section 8W.
KJ
POWER LOCKS - ELECTRICAL DIAGNOSTICS
8N - 37
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