B1E9C-1E

B1E9C-1E-REAR RIGHT 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 on the Right Rear Seat Heater Control circuit an impedance equal to or above 8.0 Ohms for more than two seconds with the output turned on.





Diagnostic Test

1. CHECK IF THE DTC IS ACTIVE

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. Ignition on, engine running.
5. Turn the Heated Seat on and operate in all modes.
6. Using a scan tool, read DTCs.

Does the scan tool show this DTC as active?

Yes

- Go To 2

No

- Go To 5

2. CHECK THE REAR SEAT CUSHION HEATER ELEMENT
1. Turn the ignition off.
2. Disconnect the Right Rear Seat Cushion Heater harness connector.

NOTE: Check connectors - Clean/repair as necessary.

3. Measure the resistance between the (P178) Right Rear Seat Heater Control circuit and the (Z909) Ground circuit at the Right Rear Seat Cushion Heater connector (seat side).

Is the resistance above 4.8 Ohms?

Yes

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

No

- Go To 3

3. CHECK THE (P178) RIGHT REAR SEAT HEATER CONTROL CIRCUIT FOR HIGH RESISTANCE IN THE BODY HARNESS
1. Disconnect the Heated Seat Module (HSM) C3 harness connector.
2. Measure the resistance of the (P178) Right Rear Seat Heater Control circuit between the HSM C3 harness connector and the Right Rear Seat Cushion Heater harness connector (harness side).

Is the resistance below 5.0 Ohms?

Yes

- Go To 4

No

- Repair the (P178) Right Rear Seat Heater Control circuit for high resistance.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

4. CHECK THE (Z909) GROUND CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance of the (Z909) Ground circuit between ground and the Right Rear Seat Cushion Heater harness connector (harness side).

Is the resistance below 5.0 Ohms?

Yes

- Replace the Heated Seat Module (HSM). Heated Seat Module - Removal.
- 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 .

5. CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit. Wiggle the wiring and connectors while checking for shorted and open circuits. Attempt to reproduce the condition by adjusting the seat(s).
3. Check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. With the scan tool, check for any Environmental Data to help identify the conditions in which the DTC was set.
5. Check Service Bulletins for any possible causes that may apply.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

- Test complete.