MSM-Charging Voltage High Message

MSM-CHARGING VOLTAGE HIGH MESSAGE

For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
With the engine running.

- Set Condition:
When the Memory/Heated Seat Adjustable Pedal Module (MHSAPM) receives a high charging system voltage message over the PCI Bus.





Diagnostic Test

1. CHECK PCM FOR DTC
Turn ignition on.
With the scan tool read Engine DTCs.
Are there any Charging System DTC's set in the Powertrain Control Module?

Yes

- Diagnose and repair the DTC(s).
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1.Power Seat System Verification Test

No

- Go To2

2. STORED CODE COMMUNICATION PROBLEMS
With the scan tool, 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 scan tool check for the same DTC to reset in the MHSAPM.
Did the same DTC reset?

Yes

- Go To3

No

- Test complete.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1.Power Seat System Verification Test

3. MEMORY/HEATED SEAT ADJUSTABLE PEDAL MODULE (MHSAPM)

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?

No

- Replace the Memory/Heated Seat Adjustable Pedal Module.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1.Power Seat System Verification Test

Yes

- Repair as necessary.
- PERFORM POWER SEAT SYSTEM VERIFICATION TEST - VER 1.Power Seat System Verification Test