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Home >> Chrysler >> 2005 >> Pacifica Limited >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Body Diagnostic Procedures - Diagnostic Information And Procedures - Park Assist System, Power Door Locks/RKE, Power Door - Liftgate, Power Mirror, Power Seats >> Power Seats >> Symptom: PCM MESSAGES NOT RECEIVED - MHSAPM >> Diagnostic Procedure

Diagnostic Procedure

PCM MESSAGES NOT RECEIVED - MHSAPM SYMPTOM CHART

TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIII®, enter Instrument Cluster, System Tests then PCM Monitor.
Does the DRBIII® display: PCM is active on BUS?
Yes --> Erase the DTC, if DTC resets, replace the Memory/Heated Seat Adjustable Pedal Module.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1 .
No --> Go To 2		 All
2 Turn the ignition on.
With the DRBIII®, attempt to communicate with the PCM.
Was the DRBIII® able to communicate with the PCM?
Yes --> Go To 3
No --> Refer to COMMUNICATION and perform the appropriate test.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1 .		 All
3 Turn the ignition off.
Disconnect the PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the PCI Bus circuit between the DLC and the PCM connector.
Is the resistance below 5.0 ohms?
Yes --> Replace and program the Powertrain Control Module in accordance with the Service Information.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1 .
No --> Repair the PCI Bus circuit for an open.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1 .		 All
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