Chrysler Pacifica. Manual — part 247
TEST
ACTION
APPLICABILITY
8
Turn ignition off.
Disconnect the MHSAPM C2 connector.
Disconnect the Driver Recliner Seat Position Sensor connector.
Measure the resistance of the Driver Seat Sensor 5 Volt Supply wire between the
Recliner Sensor connector and the C2 connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Go To 9
No
→ Repair the Driver Seat Sensor 5 Volt Supply circuit for an open.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
9
If there are no possible cause remaining, view repair.
All
Repair
Replace the Memory/Heated Seat Adjustable Pedal Module.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
985
POWER SEATS
DRIVER RECLINER SENSOR OUT OF RANGE LOW - MHSAPM —
Continued
Symptom List:
EEPROM CHECKSUM FAILURE - MHSAPM
LOOPBACK FAILURE - MHSAPM
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be EEPROM CHECKSUM FAILURE
- MHSAPM.
When Monitored and Set Condition:
EEPROM CHECKSUM FAILURE - MHSAPM
When Monitored:
With the ignition in the on position.
Set Condition:
The Memory/Heated Seat Adjustable Pedal Module has a internal
EEPROM failure.
LOOPBACK FAILURE - MHSAPM
When Monitored:
With the ignition in the on position.
Set Condition:
The Memory/Heated Seat Adjustable Pedal Module failed the internal
loopback self test.
POSSIBLE CAUSES
EEPROM CHECKSUM FAILURE
TEST
ACTION
APPLICABILITY
1
If there are no possible causes remaining, view repair.
All
Repair
Replace the Memory/Heated/Seat Adjustable Pedal Module.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
986
POWER SEATS
Symptom:
IPM MESSAGES NOT RECEIVED - MHSAPM
When Monitored and Set Condition:
IPM MESSAGES NOT RECEIVED - MHSAPM
When Monitored:
Set Condition:
The module does not receive any messages from the IPM. Time to mature
for the MHSAPM is 10 seconds. Time to mature for the IPM is 10 seconds.
POSSIBLE CAUSES
ATTEMPT TO COMMUNICATE WITH THE INTERGRATED POWER MODULE
MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRB, attempt to communicate with the IPM.
Was the DRB able to I/D or communicate with the IPM?
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 DRB, erase DTC’s.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRB, 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.
987
POWER SEATS
Symptom:
LUMBAR SWITCH STUCK - DDM
When Monitored and Set Condition:
LUMBAR SWITCH STUCK - DDM
When Monitored:
Continuously.
Set Condition:
If the switch is held in the on position for over 30 seconds, this code will
set.
POSSIBLE CAUSES
DTC PRESENT
DRIVER POWER SEAT SWITCH
DRIVER SEAT HORIZONTAL/LUMBAR IN SWITCH MUX
DRIVER SEAT RECLINER/LUMBAR OUT SWITCH MUX
DRIVER DOOR MODULE
TEST
ACTION
APPLICABILITY
1
Check the seat switches mechanical operation and also check for a possible obstruc-
tion. Correct if necessary.
Turn the ignition on.
With the DRBIII
t, erase DTCs.
Cycle the ignition switch from Off to Run.
Operate the Seat Switch in all positions several times.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display LUMBAR SWITCH STUCK?
All
Yes
→ Go To 2
No
→ The condition that caused this code to set is not present at this
time. Operate the switch several times to ensure it does not stick.
If the switch ever sticks, replace it.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
2
Disconnect the Driver Power Seat Switch connector.
Turn the ignition on.
With the DRBIII
t, erase DTCs.
Cycle the ignition switch from Off to Run and wait 15 seconds.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display LUMBAR SWITCH STUCK?
All
Yes
→ Go To 3
No
→ Replace the Driver Power Seat Switch.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
988
POWER SEATS
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