Passenger Seat Heat Output Open - MHSAPM

PASSENGER SEAT HEAT OUTPUT OPEN - MHSAPM





For a complete wiring diagram Consult Diagrams/Electrical

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

- Set Condition:
This condition is set immediately after the Memory Heated Seat Adjustable Pedal Module loses the seat heat element output.





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. PASSENGER SEAT HEATER B(+) DRIVER WIRE OPEN




Turn ignition off.
Disconnect the Passenger Heated Seat Cushion 4-way connector.
Disconnect the Memory Heated Seat Adjustable Pedal Module C1 connector.
Measure the resistance of the Passenger Seat Heater B(+) Driver circuit between the MHSAPM C1 connector and the Passenger Heated Seat Cushion 4-way connector (harness side).
Is the resistance below 1.5 ohms?

Yes

- Go To3

No

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

3. PASSENGER SEAT HEATER GROUND CKT




Reconnect the Passenger Heated Seat Cushion 4-way connector if disconnected.
Disconnect the MHSAPM C1 connector.
Disconnect the Passenger Heated Seat Back 2-way connector.
Measure the resistance of the Passenger Seat Heater Ground circuit from the MHSAPM C1 connector to the Passenger Heated Seat Back 2-way connector (harness side).
Is the resistance below 1.0 ohms?

Yes

- Go To4

No

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

4. PASSENGER SEAT CUSHION HEATER OPEN




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

Yes

- Go To5

No

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

5. SEAT BACK HEATER OPEN




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