Jeep Liberty KJ. Manual — part 151
8.
CHECK LEFT DOOR LOCK SWITCH MUX WIRE FOR AN OPEN
Disconnect the Left Door Lock Switch connector.
Measure the resistance of the (P36) Door Lock Switch Mux circuit
between cavity 14 in the JB-C2 connector and the Left Door Lock
Switch connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 9
No
>> Repair the (P36) Door Lock Switch Mux wire for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
9.
CHECK LEFT DOOR LOCK SWITCH GROUND WIRE FOR AN OPEN
Measure the resistance of the (P37) Door Lock Switch Ground circuit
between cavity 11 in the JB-C2 connector and the Left Door Lock
Switch connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Left Door Lock Switch.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
No
>> Repair the (P37) Door Lock Switch Ground wire for an
open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE)
8N - 26
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
10.
CHECK THE JUNCTION BLOCK FOR AN OPEN
Disconnect the battery ground cable.
Disconnect all the Junction Block connectors and remove the Junction Block.
Remove the Body Control Module from the Junction Block.
NOTE: Make all measurements in the Junction Block – NOT the harness connector.
Measure the resistance of the (P36) Door Lock Switch Mux circuit between cavity 23 in the Junction Block - Body
Control Module connector and cavity 10 in the Junction Block C2.
Measure the resistance of the (P36) Door Lock Switch Mux circuit between cavity 23 in the Junction Block - Body
Control Module connector and cavity 14 in the Junction Block C2.
Measure the resistance of the (P37) Door Lock Switch Ground circuit between cavity 12 in the Junction Block -
Body Control Module connector and cavity 5 in the Junction Block C2.
Measure the resistance of the (P37) Door Lock Switch Ground circuit between cavity 12 in the Junction Block -
Body Control Module connector and cavity 11 in the Junction Block C2.
Is the resistance below 1.0 ohm for each circuit?
Yes
>> Replace the Body Control Module.
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 - 27
DOOR LOCK SWITCH SHORT TO GROUND
For a complete wiring diagram Refer to Section 8W.
8N - 28
POWER LOCKS - ELECTRICAL DIAGNOSTICS
KJ
•
When Monitored:
Whenever the ignition is on.
•
Set Condition:
When the BCM detects a voltage of less than 0.25 volts on the door lock switch mux input for over 5 seconds,
this code will set. The normal voltage on the circuit is between 0.25 and 4.75 volts depending on switch posi-
tions. NOTE: Left and right switches are in parallel.
Possible Causes
(P36) LEFT DOOR LOCK SWITCH MUX WIRE SHORT TO GROUND
(P36) RIGHT DOOR LOCK SWITCH MUX WIRE SHORT TO GROUND
LEFT DOOR LOCK SWITCH - SHORTED
RIGHT DOOR LOCK SWITCH - SHORTED
JUNCTION BLOCK SHORT TO GROUND
BODY CONTROL MODULE - DOOR LOCK SWITCH MUX SHORT TO GROUND
Diagnostic Test
1.
CHECK TROUBLE CODE
Turn the ignition on.
With the scan tool, erase DTCs.
Operate the door locks several times from both door lock switches
With the scan tool read DTCs.
Does the scan tool display DOOR LOCK SWITCH 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.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE)
2.
CHECK THE LEFT DOOR LOCK SWITCH MUX CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Junction Block C2 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 ohms?
Yes
>> Go To 3
No
>> Go To 4
KJ
POWER LOCKS - ELECTRICAL DIAGNOSTICS
8N - 29
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