Chrysler Pacifica. Manual — part 252
Symptom:
PCM MESSAGES NOT RECEIVED - MHSAPM
When Monitored and Set Condition:
PCM MESSAGES NOT RECEIVED - MHSAPM
When Monitored:
With the ignition in run.
Set Condition:
The module does not receive any messages from the PCM. Time to mature
for the MHSAPM is 2 seconds. Time to mature for the IPM is 2 seconds.
POSSIBLE CAUSES
MEMORY/HEATED SEAT ADJUSTABLE PEDAL MODULE
ATTEMPT TO COMMUNICATE WITH THE PCM
PCI BUS CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, enter Instrument Cluster, System Tests then PCM Monitor.
Does the DRBIII
t display: PCM is active on BUS?
All
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
2
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the PCM.
Was the DRBIII
t able to communicate with the PCM?
All
Yes
→ Go To 3
No
→ Refer to the communication category and perform the appropriate
symptom.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
1005
POWER SEATS
TEST
ACTION
APPLICABILITY
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 TERMI-
NALS 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?
All
Yes
→ Replace and program the Powertrain Control Module in accor-
dance 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.
1006
POWER SEATS
PCM MESSAGES NOT RECEIVED - MHSAPM —
Continued
Symptom:
PDM MESSAGES NOT RECEIVED - MHSAPM
When Monitored and Set Condition:
PDM MESSAGES NOT RECEIVED - MHSAPM
When Monitored:
With the ignition in run or ACC and vehicle not in shipping mode.
Set Condition:
The module does not receive any messages from the PDM. Time to mature
for the MHSAPM is 5 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE PASSENGER DOOR MODULE
MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the Passenger Door Module.
Was the DRBIII
t able to I/D or communicate with the PDM?
All
Yes
→ Go To 2
No
→ Refer to the Communication category for the related symptom(s).
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
2
With the DRBIII
t, erase DTC’s.
Cycle the ignition switch from off to on, operate the door locks from the passenger’s
door and wait approximately 1 minute.
With the DRBIII
t, read DTC’s.
Did this DTC reset?
All
Yes
→ Replace the module which set the DTC in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
1007
POWER SEATS
Symptom:
TCM MESSAGES NOT RECEIVED - MHSAPM
When Monitored and Set Condition:
TCM MESSAGES NOT RECEIVED - MHSAPM
When Monitored:
With the ignition in unlock.
Set Condition:
The module does not receive any messages from the TCM. Time to mature
for the MHSAPM is 5 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE TCM
MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, attempt to communicate with the Transmission Control Module.
Was the DRBIII
t able to I/D or communicate with the TCM?
All
Yes
→ Go To 2
No
→ Refer to the Communication category for the related symptom(s).
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
2
With the DRBIII
t, erase DTC’s.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRBIII
t, read DTC’s.
Did this DTC reset?
All
Yes
→ Replace the module which set the DTC in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Test Complete.
1008
POWER SEATS
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