B1E9B-11

B1E9B-11-REAR LEFT HEATER CONTROL CIRCUIT - CIRCUIT SHORT TO GROUND





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With the engine running.

- Set Condition:
The Heated Seat Module (HSM) detects Voltage below 1.0 volt or current above 10.0 amps on the (P177) Left Rear Seat Heater Control circuit for more than two seconds with the output turned on.





1. TEST FOR INTERMITTENT CONDITION

NOTE: Make sure the battery is fully charged and the charging system is operating properly before proceeding.

1. Turn the ignition on.
2. Using a scan tool, record and erase Diagnostic Trouble Codes (DTCs).
3. Turn the ignition off.
4. Start the engine and let it run.
5. Turn the Heated Seat on and operate in all modes.
6. Using a scan tool, read DTCs.

Is the DTC active?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Verify seat harness is routed correctly to the HSM. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals. Attempt to reproduce condition by adjusting the front seat.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT IN BODY HARNESS FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the Left Rear Seat Cushion Heater harness connector.

NOTE: Check connectors. Clean and repair as necessary.

3. Turn the ignition on.
4. Using a scan tool, erase DTCs.
5. Turn the ignition off.
6. Start the engine and let it run.
7. Turn the Heated Seat on and operate in all modes.
8. Using a scan tool, read DTCs.

Is the same DTC active?

Yes

- Go To 3

No

- Replace the shorted Rear Seat Cushion Heater Element. Heater Pad - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the HSM C3 harness connector.

NOTE: Check connectors. Clean and repair as necessary.

3. Measure the resistance of the (P177) Left Rear Seat Heater Control circuit between ground and the HSM C3 harness connector.

Is the resistance below 10K Ohms?

Yes

- Repair the (P177) Left Rear Seat Heater Control circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. CHECK (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR A SHORT TO THE (P968) HEATED SEAT SENSOR RETURN CIRCUIT OR TO (Z923) GROUND CIRCUIT




1. Measure the resistance between the (P177) Left Rear Seat Heater Control circuit and the (P968) Heated Seat Sensor Return circuit at the Left Rear Seat Cushion Heater harness connector.
2. Measure the resistance between the (P177) Left Rear Seat Heater Control circuit and the (Z923) Ground circuit at the the Left Rear Seat Cushion Heater harness connector.

Is the resistance below 10K Ohms for either measurement?

Yes

- Repair all circuits with a resistance below 10K Ohms for a short to the (P177) Left Rear Seat Heater Control circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Heated Seat Module (HSM). Heated Seat Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.