B1EB3-1A

B1EB3-1A-REAR LEFT SEAT HEATER SENSOR - CIRCUIT RESISTANCE BELOW THRESHOLD

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

- When Monitored:
When Heated Seat Module (HSM) is powered.

- Set Condition:
The Heated Seat Module (HSM) detects the signal from the Negative Temperature Coefficient (NTC) thermistor is below its threshold for more than two seconds.









Diagnostic Test

1. CHECK IF THE DTC IS ACTIVE

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).

NOTE: It is recommended to record any Environmental Data to help identify the conditions in which the DTC was set.

3. Turn the ignition off.
4. Ignition on, engine running.
5. With the scan tool, read Heated Seat Module (HSM) DTCs.

Does the scan tool show this DTC as active?

Yes

- Go To 2

No

- Go To 5

2. CHECK THE LEFT REAR SEAT TEMPERATURE SENSOR
1. Turn the ignition off.
2. Disconnect the HSM C2 harness connector.
3. Disconnect the HSM C3 harness connector.
4. Measure the resistance between the (P672) Left Rear Heated Seat Temp Sense circuit in the HSM C3 harness connector and the (P968) Heated Seat Sensor Return circuit in the HSM C2 harness connector.
5. Compare the measured resistance to the Temperature Sensor Resistance chart.

Is the resistance within the specifications listed in the chart?

Yes

- Go To 3

No

- Go To 4

3. CHECK (P672) LEFT REAR HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (P672) Left Rear Heated Seat Temp Sense circuit in the HSM C3 harness connector.

Is the resistance below 10K Ohms?

Yes

- Repair the (P672) Left Rear Heated Seat Temp Sense circuit for a short to ground.
- 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 .

4. CHECK THE LEFT REAR SEAT WIRING HARNESS
1. Disconnect the Left Rear Seat Cushion Heater harness connector.
2. Measure the resistance between the (P672) Left Rear Heated Seat Temp Sense circuit and the (P968) Heated Seat Sensor Return circuit in the Left Rear Seat Cushion Heater connector.
3. Compare the measured resistance to the Temperature Sensor Resistance chart.

Is the resistance within the specifications listed in the chart?

Yes

- Repair or replace the Left Rear Seat wiring harness for a short.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

- Replace the Left Rear Seat Temperature Sensor (Left Rear Seat Cushion Heater Element). Heater Pad - Removal.
- 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. Verify the seat wiring harness is routed correctly to the Heated Seat Module (HSM).
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.