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Jeep Liberty KJ. Manual - part 1445
Possible Causes
BODY CONTROL MODULE (BCM) DTC(S) PRESENT
(Z938) GROUND CIRCUIT OPEN
(G15) KEY-IN IGNITION SWITCH SENSE CIRCUIT OPEN
IGNITION SWITCH OPEN
BODY CONTROL MODULE (BCM)
Diagnostic Test
1.
CHECK FOR DTCs IN THE BODY CONTROL MODULE (BCM)
NOTE: The driver door ajar switch must be operational for the result of this test to be valid.
Turn the ignition on.
With the scan tool, read BCM DTCs.
Does the scan tool display any Cluster Wake Up Output or Communication DTCs?
Yes
>> Refer to the Table of Contents in (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAGNOSIS
AND TESTING) or in (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS
AND TESTING) for the applicable diagnostic procedures.
No
>> Go To 2
2.
CHECK THE KEY IN IGNITION STATUS WITH THE SCAN TOOL
With the scan tool in BCM, select Input Output.
With the scan tool, read the Key In Ignition Status.
Does the scan tool display: Key In Ignition?
Yes
>> Replace and program the BCM in accordance with the Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> Go To 3
3.
CHECK FOR AN OPEN IGNITION SWITCH
Back probe the Ignition Switch harness connector with a jumper wire
between the (G15) Key-In Ignition Switch Sense circuit and the (Z938)
Ground circuit.
With the scan tool, read the Key In Ignition Status.
Does the scan tool display: Key In Ignition?
Yes
>> Replace the Ignition Switch in accordance with the Service
Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 -
ELECTRICAL/ELECTRONIC
CONTROL
MODULES
-
STANDARD PROCEDURE).
No
>> Go To 4
8B - 8
CHIME/BUZZER - ELECTRICAL DIAGNOSTICS
KJ