Jeep Liberty KJ. Manual — part 152
3.
CHECK LEFT DOOR LOCK SWITCH MUX WIRE FOR A SHORT TO GROUND
Disconnect the Left Door Lock Switch connector.
Measure the resistance between ground and the (P36) Door Lock
Switch Mux circuit cavity 14 in the JB-C2 connector.
Is the resistance below 1000.0?
Yes
>> Repair the (P36) Door Lock Switch Mux wire for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Replace the Left Door Lock Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
4.
CHECK THE RIGHT DOOR LOCK SWITCH MUX CIRCUIT FOR A SHORT TO GROUND
Measure the resistance between ground and the (P36) Door Lock
Switch Mux circuit cavity 10 in the JB-C2 connector.
Is the resistance below 1000.0 ohms?
No
>> Go To 6
Yes
>> Go To 5
8N - 30
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
5.
CHECK RIGHT DOOR LOCK SWITCH MUX WIRE FOR A SHORT TO GROUND
Disconnect the Right Door Lock Switch connector.
Measure the resistance between ground and the (P36) Door Lock
Switch Mux circuit cavity 10 in the JB-C2 connector.
Is the resistance below 1000.0 ohms?
Yes
>> Repair the (P36) Door Lock Switch Mux wire for a short to
ground.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Replace the Right Door Lock Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
6.
CHECK THE JUNCTION BLOCK FOR A SHORT TO GROUND
Remove the Body Control Module from the Junction Block.
NOTE: Ensure the Junction Block C1, C2 and C3 connectors are
connected before proceeding.
Measure the resistance between ground and the (P36) Door Lock
Switch Mux circuit cavity 23 in the Junction Block - Body Control Mod-
ule connector.
Is the resistance below 2000.0 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
>> 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)
KJ
POWER LOCKS - ELECTRICAL DIAGNOSTICS
8N - 31
TAILGATE LOCK MOTOR SHORT TO VOLTAGE
For a complete wiring diagram Refer to Section 8W.
8N - 32
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
Whenever the ignition is on.
•
Set Condition:
When the BCM detects voltage on either the Tailgate Lock Driver or Unlock Driver circuit for longer than 5
seconds when the Tailgate is not being actuated. If there is, the BCM will disable the lock functions to protect
the BCM.
Possible Causes
TAILGATE (P30) LOCK OR (P31) UNLOCK CIRCUIT SHORT TO VOLTAGE
JUNCTION BLOCK - SHORT TO VOLTAGE
BODY CONTROL MODULE
Diagnostic Test
1.
CHECK TROUBLE CODE
Turn the ignition on.
With the scan tool, erase DTCs.
Cycle the ignition switch from Off to On and wait 10 seconds.
With the scan tool , read DTCs.
Does the scan tool display TAILGATE LOCK MOTOR SHORT TO VOLTAGE?
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. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
2.
CHECK TAILGATE LOCK OR UNLOCK CIRCUIT FOR A SHORT TO VOLTAGE
Turn the ignition off.
Disconnect the Junction Block C2 connector.
Turn the ignition on.
Measure the voltage between (P30) Tailgate Lock Driver circuit and
ground.
Is there any voltage present?
Yes
>> Repair the Tailgate (P30) Lock or (P31) Unlock Driver for a
short to voltage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Go To 3
KJ
POWER LOCKS - ELECTRICAL DIAGNOSTICS
8N - 33
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