Chrysler Pacifica. Manual — part 113
Symptom List:
SEAT HEAT LOAD SHED CHARGING UNDER VOLTAGE - MHSAPM
CHARGING VOLTAGE HIGH MESSAGE - MHSAPM
CHARGING VOLTAGE LOW MESSAGE - MHSAPM
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be SEAT HEAT LOAD SHED
CHARGING UNDER VOLTAGE - MHSAPM.
When Monitored and Set Condition:
SEAT HEAT LOAD SHED CHARGING UNDER VOLTAGE - MHSAPM
When Monitored:
With the engine running.
Set Condition:
When the Memory/Heated Seat Adjustable Pedal Module receives a low
charging system voltage message over the PCI Bus.
CHARGING VOLTAGE HIGH MESSAGE - MHSAPM
When Monitored:
With the engine running.
Set Condition:
When the Memory/Heated Seat Adjustable Pedal Module receives a high
charging system voltage message over the PCI Bus.
CHARGING VOLTAGE LOW MESSAGE - MHSAPM
When Monitored:
With the engine running.
Set Condition:
When the Memory/Heated Seat Adjustable Pedal Module receives a low
charging system voltage message over the PCI Bus.
POSSIBLE CAUSES
PCM TROUBLE CODES
STORED CODE COMMUNICATION PROBLEMS
MEMORY/HEATED SEAT ADJUSTABLE PEDAL MODULE
INTERMITTENT PROBLEM
TEST
ACTION
APPLICABILITY
1
Turn ignition on.
With the DRBIII
t read Engine DTCs.
Are there any Charging System DTC’s set in the Powertrain Control Module?
All
Yes
→ Refer to POWERTRAIN symptom list for related CHARGING
SYSTEM diagnostic trouble codes.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER
1.
No
→ Go To 2
449
ELECTRICALLY HEATED SYSTEMS
TEST
ACTION
APPLICABILITY
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.
With the DRBIII
t check for the same DTC to reset in the MHSAPM.
Did the same DTC reset?
All
Yes
→ Go To 3
No
→ Test complete.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
3
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wiring harness connectors. Look for
broken, bent, pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Were any problems found?
All
No
→ Replace the Memory/Heated Seat Adjustable Pedal Module.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER 1.
Yes
→ Repair as necessary.
Perform POWER SEAT SYSTEM VERIFICATION TEST - VER
1.
450
ELECTRICALLY HEATED SYSTEMS
SEAT HEAT LOAD SHED CHARGING UNDER VOLTAGE - MHSAPM —
Continued
Symptom:
*FRONT HEATED SEAT SWITCH INDICATOR TURNS ON THEN
GOES OFF
POSSIBLE CAUSES
MEMORY HEATED SEAT ADJUSTABLE PEDAL MODULE COMMUNICATION
INTERMITTENT CONDITION
TEST
ACTION
APPLICABILITY
1
With the DRBIII
t, attempt to communicate with the MHSAPM and check for PCI
bus communication DTC’s.
Were there any problems found?
All
Yes
→ Refer to the Communication symptom list.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Refer to any Technical Service Bulletins (TSBs) that may apply.
Using the wiring diagram/schematic as a guide, inspect the
wiring and connectors.
Perform BODY VERIFICATION TEST - VER 1.
451
ELECTRICALLY HEATED SYSTEMS
Symptom:
BACKUP LAMP OUTPUT OPEN-BCM
POSSIBLE CAUSES
INTERMITTENT CONDITION
GROUND CIRCUIT
BACKUP LAMP OPEN
BACKUP LAMP DRIVER CIRCUIT OPEN
BODY CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, clear all BCM DTC’s.
Actuate the Backup Lamps.
With the DRBIII
t, read the DTC information.
Does the DRBIII
t read: Backup Lamp Output Open?
All
Yes
→ Go To 2
No
→ The condition that caused the symptom is currently not present.
Inspect the related wiring for a possible intermittent condition.
Look for terminal push out or any chafed, pierced, pinched, or
partially broken wires.
Perform BODY VERIFICATION TEST - VER 1.
2
Turn the ignition off
Disconnect the inoperative rear tail lamp harness connector.
Using a 12-volt test light connected to 12-volts, check the ground circuit.
Does the test light illuminate brightly?
All
Yes
→ Go To 3
No
→ Repair the Ground Circuit.
Perform BODY VERIFICATION TEST - VER 1.
3
Turn the ignition off.
Disconnect the inoperative rear tail lamp harness connector.
Turn the ignition on.
Engage the transmission to reverse.
Using a 12-volt test light connected to ground, check the Backup Lamps Output
circuit.
Does the test light illuminate brightly?
All
Yes
→ Replace the applicable Backup Lamp.
Perform BODY VERIFICATION TEST - VER 1.
No
→ Go To 4
452
EXTERIOR LIGHTING
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