MHSM-Passenger Seat Heat Output Short To Ground

MHSM-PASSENGER SEAT HEAT OUTPUT SHORT TO GROUND





For a complete wiring diagram Consult Diagrams/Electrical

- When Monitored:
Ignition on, during the heated seat operation.

- Set Condition:
This code is set immediately after the Memory Heated Seat Adjustable Pedal Module detects an output shorted to ground.





Diagnostic Test

1. STORED DTC
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.
Operate the heated seat system.
With the scan tool check for the same DTC to reset in the MHSAPM.
Did the same DTC reset?

Yes

- Go To2

No

- Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent condition.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

2. DETERMINING LOCATION OF SHORT TO GROUND
Disconnect the Passenger Heated Seat Cushion 4-way connector.
With the scan tool, erase DTC's.
Turn the Passenger Seat Heater on.
Using the scan tool re-read DTC's
Does the scan tool show the same code?

Yes

- Go To3

No

- Go To5

3. (P95) PASSENGER SEAT HEATER B(+) DRIVER WIRE SHORT TO (P97) PASSENGER SEAT HEATER GROUND




Turn ignition off.
Disconnect the MHSAPM C1 connector.
The Passenger Heated Seat Cushion 4-way connector is disconnected.
Measure the resistance of the (P95) Passenger Seat Heater B(+) Driver circuit to the (P97) Passenger Seat Heater Ground circuit.
Is the resistance below 1000.0 ohms?

Yes

- Repair the (P95) Passenger Seat Heater B(+) Driver wire for a short to the (P97) Passenger Seat Heater Ground circuit.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To4

4. (P95) PASSENGER SEAT HEATER B(+) DRIVER WIRE SHORT TO GROUND




Turn ignition off.
Disconnect the MHSAPM C1 connector.
Measure the resistance of the Passenger Seat Heater B(+) Driver circuit to ground.
Is the resistance below 1000.0 ohms?

Yes

- Repair the (P95) Passenger Seat Heater B(+) Driver wire for a short to ground.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Replace the Memory Heated Seat Adjustable Pedal Module
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

5. PASSENGER HEATED SEAT CUSHION SHORT TO GROUND




Measure the resistance of the (P95) Passenger Seat Heater B(+) Driver circuit in the Passenger Heated Seat Cushion 4-way connector cushion side to body ground.
Is the resistance below 4.0 ohms?

Yes

- Repair the pigtail wiring for a short to the seat frame or replace the Passenger Heated Seat Cushion/Element as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To6

6. PASSENGER HEATED SEAT BACK SHORT TO GROUND




Disconnect the Passenger Heated Seat Back 2-way connector.
Measure the resistance of the Passenger Heated Seat Driver to the Passenger Seat Heater Ground, in the Passenger Heated Seat Back 2-way connector (seat back side).
Is the resistance below 4.0 ohms?

Yes

- Replace the Passenger Heated Seat Back/Element as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To7

7. HEATED SEAT DRIVER SHORTED TO HEATER GROUND




Measure the resistance of the Passenger Seat Heater B(+) Driver circuit to the Passenger Seat Heater Ground circuit at the Passenger Heated Seat Cushion 4-way connector.
Is the resistance below 3.5 ohms?

Yes

- Repair the Passenger Seat Heater B(+) Driver circuit for a short to the Passenger Seat Heater Ground circuit or replace the Passenger Heated Seat Cushion/Element as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Inspect the heated seat wiring for a short that may have been removed during testing and repair as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.