MHSM-Driver Seat Heat Output Short To Ground

MHSM-DRIVER 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. DRIVER SEAT HEATER B+ DRIVER CIRCUIT SHORT TO GROUND
Disconnect the Driver Heated Seat Cushion 4-way connector.
With the scan tool, erase DTC's.
Turn the Driver 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. (P87) DRIVER SEAT HEATER B(+) DRIVER WIRE SHORT TO GROUND AT MHSAPM HARNESS




Turn ignition off.
Disconnect the MHSAPM C3 connector.
Measure the resistance of the (P87) Driver Seat Heater B(+) Driver circuit to the (P94) Driver Seat Heater Ground circuit.
Is the resistance below 1000.0 ohms?

Yes

- Repair the (P87) Driver Seat Heater B(+) Driver wire for a short to the (P94) Driver Seat Heater Ground circuit.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go To4

4. (P87) DRIVER SEAT HEATER B(+) DRIVER WIRE SHORT TO SEAT FRAME/GROUND




Turn ignition off.
Measure the resistance of the (P87) Driver Seat Heater B(+) Driver circuit to ground at the MHSAPM C3 connector.
Is the resistance below 1000.0 ohms?

Yes

- Repair the (P87) Driver 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. DRIVER HEATED SEAT CUSHION SHORT TO GROUND




Measure the resistance of the (P87) Driver Seat Heater B(+) Driver circuit in the Driver Heated Seat Cushion 4-way connector cushion side to body ground.
Is the resistance below 1000.0 ohms?

Yes

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

No

- Go To6

6. DRIVER HEATED SEAT BACK SHORT TO GROUND




Disconnect the Driver Heated Seat Back 2-way connector.
Measure the resistance of the (P87) Driver Seat Heater B(+) Driver to the Driver Seat Heater Ground, in the Driver Heated Seat Back 2-way connector (seat back side).
Is the resistance below 4.0 ohms?

Yes

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

No

- Go To7

7. (P87) DRIVER SEAT HEATER B(+) DRIVER SHORTED TO HEATER GROUND




Measure the resistance of the (P87) Driver Seat Heater B(+) Driver circuit to the (P94) Driver Seat Heater Ground circuit at the Driver Heated Seat Cushion 4-way connector.
Is the resistance below 3.5 ohms?

Yes

- Repair the Driver Seat Heater B(+) Driver circuit for a short to the Driver Seat Heater Ground circuit or replace the Driver 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.