Jeep Liberty KJ. Manual — part 1456
ITM MESSAGES NOT RECEIVED
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The BCM does not receive any messages from the Intrusion Transceiver Module (ITM) for at least 30 seconds.
Possible Causes
(D25) PCI BUS CIRCUIT OPEN
INTRUSION TRANSCEIVER MODULE POWER AND GROUND
BODY CONTROL MODULE
Diagnostic Test
1.
ATTEMPT TO COMMUNICATE WITH THE INTRUSION TRANSCEIVER MODULE (ITM)
Turn the ignition on.
With the scan tool attempt to communicate with the ITM.
Was the scan tool able to I/D or communicate with the ITM?
Yes
>> Go To 2
No
>> Refer to the table of contents and perform the related symptom.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
2.
BODY CONTROL MODULE
With the scan tool, erase the BCM DTC’s.
Turn the ignition on and wait approximately 1 minute.
With the scan tool, read the BCM DTC’s.
Did this DTC reset?
Yes
>> Replace the Body Control Module in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> The condition that set this DTC is no longer present. Using the wiring diagram/schematic as a guide,
inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con-
nectors for broken, bent, pushed out, and corroded terminals.
8E - 36
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
LOST COMMUNICATION WITH ITM, NO IFR RECEIVED
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The BCM does not receive any messages from the Intrusion Transceiver Module (ITM) for at least 30 seconds.
Possible Causes
(D25) PCI BUS CIRCUIT OPEN
INTRUSION TRANSCEIVER MODULE POWER AND GROUND
BODY CONTROL MODULE
Diagnostic Test
1.
ATTEMPT TO COMMUNICATE WITH THE INTRUSION TRANSCEIVER MODULE (ITM)
Turn the ignition on.
With the scan tool attempt to communicate with the ITM.
Was the scan tool able to I/D or communicate with the ITM?
Yes
>> Go To 2
No
>> Refer to the table of contents and perform the related symptom.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
2.
BODY CONTROL MODULE
With the scan tool, erase the BCM DTC’s.
Turn the ignition on and wait approximately 1 minute.
With the scan tool, read the BCM DTC’s.
Did this DTC reset?
Yes
>> Replace the Body Control Module in accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> The condition that set this DTC is no longer present. Using the wiring diagram/schematic as a guide,
inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con-
nectors for broken, bent, pushed out, and corroded terminals.
KJ
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
8E - 37
PCM/ECM MESSAGES NOT RECEIVED
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The BCM does not receive any messages from the PCM/ECM for at least 30 seconds.
Possible Causes
PCM/ECM POWER AND GROUND
CAN C BUS CIRCUIT FAULT
BODY CONTROL MODULE
Diagnostic Test
1.
ATTEMPT TO COMMUNICATE WITH THE PCM/ECM
Turn the ignition on.
With the scan tool attempt to communicate with the PCM/ECM.
Was the scan tool able to I/D or communicate with the PCM/ECM?
Yes
>> Go To 2
No
>> Refer to the table of contents and perform the related symptom.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
2.
BODY CONTROL MODULE
With the scan tool, erase the BCM DTC’s.
Turn the ignition on and wait approximately 1 minute.
With the scan tool, read the BCM DTC’s.
Did this DTC reset?
Yes
>> Ensure the CAN C Bus circuits are not open at the BCM, if ok then replace the Body Control Module in
accordance with the service information.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> The condition that set this DTC is no longer present. Using the wiring diagram/schematic as a guide,
inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con-
nectors for broken, bent, pushed out, and corroded terminals.
8E - 38
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
KJ
VIN MSG NOT RECEIVED
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
If the Body Control Module (BCM) either fails to receive a VIN message within 1 second or the VIN message
contains signal not available (SNA) information.
Possible Causes
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
DTCs RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES
CAN C BUS CIRCUITS OPEN OR SHORTED
ECM OR PCM DTCs PRESENT
ECM OR PCM
BCM
Diagnostic Test
1.
VERIFY DTC IS ACTIVE
Turn the ignition on.
With the scan tool, record an erase BCM DTCs.
Cycle the ignition switch.
With the scan tool, read BCM DTCs.
Does this DTC reset?
Yes
>> Go To 2
No
>> Using the schematics as a guide, check the BCM and the ECM or PCM pins, terminals, and connectors
for corrosion, damage, and terminal push out. Pay particular attention to all Communication circuits.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
2.
CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs
With the scan tool, read all active DTCs from all CAN C Bus modules.
NOTE: Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.
Does the scan tool display any active DTCs related to the conditions listed above?
Yes
>> Diagnose and repair the DTC(s). Refer to the Table of Contents in the applicable Section.
No
>> Go To 3
3.
CHECK IF ECM OR PCM DTCs ARE PRESENT
With the scan tool, read ECM or PCM DTCs.
Are any DTCs present?
Yes
>> Diagnose and repair the DTC(s). Refer to 9 - ENGINE - DIAGNOSIS AND TESTING.
Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES - STANDARD PROCEDURE).
No
>> Go To 4
KJ
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTIC
8E - 39
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