MHSM-Driver Seat Heat Output Open

MHSM-DRIVER SEAT HEAT OUTPUT OPEN





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 senses an open on the seat heat element output circuit.





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 schematic as a guide, inspect the wiring and connectors for an intermittent condition. Check for an intermittent open cushion or seat back element by applying pressure to seat with the heater on and watch the scan tool for the DTC to reset.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

2. (P87) DRIVER SEAT HEATER B(+) DRIVER WIRE OPEN




Turn ignition off.
Disconnect the Driver Heated Seat Cushion 4-way connector.
Disconnect the Memory Heated Seat Adjustable Pedal Module C3 connector.
Measure the resistance of the (P87) Driver Seat Heater B(+) Driver circuit between the MHSAPM C3 connector and the Driver Heated Seat Cushion 4-way connector, (harness side).
Is the resistance below 1.0 ohms?

Yes

- Go To3

No

- Repair the open (P87) Driver Seat Heater B(+) Driver wire.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

3. (P94) DRIVER SEAT HEATER GROUND CKT




Reconnect the Driver Heated Seat Cushion 4-way connector if disconnected.
Disconnect the MHSAPM C3 connector.
Disconnect the Driver Heated Seat Back 2-way connector.
Measure the resistance of the (P94) Driver Seat Heater Ground circuit from the MHSAPM C3 connector to the Driver Heated Seat Back 2-way connector (harness side).
Is the resistance below 1.0 ohms?

Yes

- Go To4

No

- Repair the (P94) Driver Seat Heater Ground circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.

4. DRIVER SEAT CUSHION HEATER OPEN




Disconnect the Driver Heated Seat Cushion 4-way connector.
Disconnect the Driver Heated Seat Back 2-way connector.
Measure the resistance of the SEAT CUSHION HEATER ELEMENT by connecting one lead to the Driver Seat Heater B(+) Driver terminal and the other lead to the Driver Seat Heater Ground in the Heated Seat Cushion 4-way connector (seat side).
Is the resistance below 5.0 ohms?

Yes

- Go To5

No

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

5. SEAT BACK HEATER OPEN




Disconnect the Driver Heated Seat Back 2-way connector.
Measure the resistance of the SEAT BACK HEATER ELEMENT by connecting one lead to the Heated Seat Driver terminal and the other to the Driver Seat Heater Ground terminal in the Heated Seat Back 2-way connector.
Is the resistance below 5.6 ohms?

Yes

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

No

- Repair the pigtail wiring or replace the Driver Heated Seat Back/Element as necessary.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test.