Chrysler Pacifica. Manual — part 249
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Driver Power Seat Switch connector.
Disconnect the Driver Door Module C2 connector.
Inspect the Memory Select Switch MUX circuit for a partial short to ground or to
another circuit in the seat switch harness.
Were there any problems found?
All
Yes
→ Repair the Memory Select Switch MUX circuit as necessary.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER
1.
No
→ Replace the Driver Door Module.
Perform BODY VERIFICATION TEST - VER 1.
993
POWER SEATS
MEMORY SWITCH STUCK - DDM —
Continued
Symptom:
MODULE TYPE MISMATCH - MHSAPM
When Monitored and Set Condition:
MODULE TYPE MISMATCH - MHSAPM
When Monitored:
Continuously.
Set Condition:
If a Memory Seat Adjustable Pedal Module receives a request for heated
seat activation over the PCI bus from either of the door modules.
POSSIBLE CAUSES
STORED DTC
INCORRECT MODULE ON VEHICLE
MEMORY/HEATED SEAT ADJUSTABLE PEDAL MODULE
TEST
ACTION
APPLICABILITY
1
Note: Refer to any technical service bulletins that may apply.
With the DRBlll
t under module display, verify that the Memory/Heated Seat
Adjustable Pedal Module (MHSAPM) or Memory Seat Adjustable Pedal Module
(MSAPM) installed on the vehicle matches the vehicle’s equipment.
Is the correct module installed on the vehicle?
All
No
→ Replace with the correct Memory/Heated Seat Adjustable Module.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
Yes
→ Go To 2
2
With the DRBIII
t, erase the DTC from Memory/Heated Seat Adjustable Pedal
Module.
Turn the ignition switch to the Off position then start the engine and let run for one
minute.
Attempt to operate the Heated Seats if equipped.
With the DRBIII
t check for the same DTC to reset in the MHSAPM.
Did the same DTC reset?
All
Yes
→ Replace the Memory/Heated Seat Adjustable Module.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER
1.
No
→ Test complete.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
994
POWER SEATS
Symptom List:
PASSENGER HORIZONTAL SEAT SWITCH OPEN - PDM
PASSENGER RECLINER SWITCH OPEN - PDM
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be PASSENGER HORIZONTAL
SEAT SWITCH OPEN - PDM.
When Monitored and Set Condition:
PASSENGER HORIZONTAL SEAT SWITCH OPEN - PDM
When Monitored:
Continuously.
Set Condition:
If the switch MUX circuit is over 4.9 volts for over 10 second, this code will
set.
PASSENGER RECLINER SWITCH OPEN - PDM
When Monitored:
Continuously.
Set Condition:
If the switch MUX circuit is over 4.9 volts for over 10 second, this code will
set.
POSSIBLE CAUSES
DTC PRESENT
PASSENGER SEAT SWITCH MUX WIRE OPEN
PASSENGER SEAT SWITCH MUX WIRE SHORT TO VOLTAGE
SEAT SWITCH MUX RETURN
PASSENGER DOOR MODULE
PASSENGER SEAT SWITCH
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, erase DTCs.
Cycle the ignition switch from Off to Run.
Operate the switch that had the DTC in all positions several times.
With the DRBIII
t, read DTCs.
Does the DRBIII
t display the same DTC?
All
Yes
→ Go To 2
No
→ The condition that caused this code to set is not present at this
time. Review wiring schematics and inspect related wiring for
intermittent open condition.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
995
POWER SEATS
TEST
ACTION
APPLICABILITY
2
Turn the ignition on.
With the DRBIII
t in Sensors, read the Seat Switch voltage of the switch that had the
DTC.
Select the voltage displayed.
All
4.4 to 5.1 volts.
Over 5.2 volts
3
Turn the ignition on.
Disconnect the Passenger Seat Switch connector.
Measure the voltage of the Switch MUX circuit indicated by the DRBlll
t and ground.
Is the voltage between 4.4 and 5.1 volts?
All
Yes
→ Go To 4
No
→ Repair the Passenger Seat Switch MUX wire for an open.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
4
Turn the ignition off.
Disconnect the Passenger Seat Switch connector.
Measure the resistance of the Seat Switch MUX Return circuit in the switch
connector.
Is the resistance below 5.0 ohms?
All
Yes
→ Replace the Passenger Seat Switch.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER
1.
No
→ Repair the Seat Switch MUX Return for an open.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
5
Turn the ignition off.
Disconnect the Passenger Seat Switch connector.
Disconnect the Passenger Door Module C2 connector.
Inspect the Seat Switch MUX circuit that had the DTC for a possible short to voltage.
Were there any problems found?
All
Yes
→ Repair the Passenger Seat Switch MUX circuit for a short to
voltage.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER
1.
No
→ Replace the Passenger Door Module.
Perform BODY VERIFICATION TEST - VER 1.
996
POWER SEATS
PASSENGER HORIZONTAL SEAT SWITCH OPEN - PDM —
Continued
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