B1E9B-1E

B1E9B-1E-REAR LEFT HEATER CONTROL CIRCUIT - CIRCUIT RESISTANCE OUT OF RANGE





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

- When Monitored:
With the engine running.

- Set Condition:
The Heated Seat Module (HSM) detects impedance above threshold 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: Before proceeding, verify the battery is fully charged, the charging system is operating properly, no Battery or System voltage Diagnostic Trouble Codes (DTCs) are set and the HSM Power and Ground circuits are clean and tight.

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 LEFT REAR SEAT CUSHION HEATER ELEMENT RESISTANCE




1. Turn the ignition off.
2. Disconnect the Left Rear Seat Cushion Heater harness connector.

NOTE: Check connectors. Clean and repair as necessary.

3. Measure the resistance between the (P177) Left Rear Seat Heater Control circuit and the (Z909) Ground circuit at the Left Rear Seat Cushion Heater harness connector (seat side).

Is the resistance above 4.8 Ohms?

Yes

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

No

- Go To 3

3. CHECK (P177) LEFT REAR SEAT HEATER CONTROL CIRCUIT FOR HIGH RESISTANCE IN BODY HARNESS




1. Disconnect the HSM C3 harness connector.

NOTE: Check connectors. Clean and repair as necessary.

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

Is the resistance below 5.0 Ohms?

Yes

- Go To 4

No

- Repair the (P177) Left Rear Seat Heater Control circuit for high resistance.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK (Z909) GROUND CIRCUIT FOR HIGH RESISTANCE




1. Measure the resistance of the (Z909) Ground circuit between ground and the Left Rear Seat Cushion Heater harness connector (harness side).

Is the resistance below 5.0 Ohms?

Yes

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

No

- Repair the (Z909) Ground circuit for high resistance.
- Perform the BODY VERIFICATION TEST. Body Verification Test.