Jeep Liberty KJ. Manual — part 335
ROM CHECKSUM ERROR
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The Hands Free Module detects a fault during an internal diagnostic check.
Possible Causes
HANDS FREE MODULE
Diagnostic Test
1.
ERASE DTC AND ATTEMPT TO RESET
Turn the ignition on.
With the scan tool, read and record the HFM DTC’s and then erase the DTC’s.
Perform 5 ignition key cycles, leaving the ignition key on for a minimum of 90 seconds per cycle.
With the scan tool, read the HFM DTC’s.
Did this DTC reset?
Yes
>> Replace and program the Hands Free 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.
8T - 62
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
KJ
RPM MESSAGE NOT RECEIVED
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The Hands Free Module does not detect a Bus message indicating current engine RPM.
Possible Causes
LOST COMMUNICATION WITH PCM
HANDS FREE MODULE
Diagnostic Test
1.
ATTEMPT TO COMMUNICATE WITH THE PCM
Start and idle the engine.
With the scan tool, select Engine and read the Engine RPM.
Was the scan tool able to communicate with the PCM and read engine RPM?
Yes
>> Go To 2
No
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) and
perform the related symptom.
2.
ERASE DTC AND ATTEMPT TO RESET
With the scan tool, erase the HFM DTC’s.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the scan tool, read the HFM DTC’s.
Did this DTC reset?
Yes
>> Replace and program the Hands Free 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
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
8T - 63
VIN MESSAGE NOT RECEIVED
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
With the ignition on.
•
Set Condition:
The Hands Free Module does not receive the VIN message from the PCM.
Possible Causes
LOST COMMUNICATION WITH PCM
PCM NOT ACTIVE ON THE BUS NETWORK
HANDS FREE MODULE
Diagnostic Test
1.
ATTEMPT TO COMMUNICATE WITH THE PCM
Turn the ignition on.
With the scan tool, attempt to communicate with the PCM.
Was the scan tool able to communicate with the PCM?
Yes
>> Go To 2
No
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) and
perform the related symptom.
2.
CHECK PCM ACTIVITY ON THE BUS NETWORK
With the scan tool, select System Monitors then J1850 Module Scan.
Does the scan tool indicate that the PCM is present or active on the bus network?
Yes
>> Go To 3
No
>> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) and
perform the related symptom.
3.
ERASE DTC AND ATTEMPT TO RESET
With the scan tool, erase the HFM DTC’s.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the scan tool, read the HFM DTC’s.
Did this DTC reset?
Yes
>> Replace and program the Hands Free 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.
8T - 64
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
KJ
VOICE RECOGNITION SWITCH STUCK
For a complete wiring diagram Refer to Section 8W.
KJ
NAVIGATION/TELECOMMUNICATION - ELECTRICAL DIAGNOSTICS
8T - 65
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