B1EB1-1A

B1EB1-1A-FRONT 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 that the (P687) Left Front Heated Seat Temp Sense circuit NTC is below threshold for more than two seconds.





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. 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 seat.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK (P687) LEFT FRONT HEATED SEAT TEMP SENSE CIRCUIT IN BODY HARNESS FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the Left 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. Using a scan tool, read DTCs.

Is the same DTC active?

Yes

- Go To 3

No

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

3. CHECK (P687) LEFT FRONT HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the HSM C2 harness connector.

NOTE: Check connectors. Clean and repair as necessary.

3. Measure the resistance of the (P687) Left Front Heated Seat Temp Sense circuit between ground and the Left Seat Cushion Heater connector (harness side).

Is the resistance below 10K Ohms?

Yes

- Repair the (P687) Left Front Heated Seat Temp Sense circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. CHECK (P687) LEFT FRONT HEATED SEAT TEMP SENSE CIRCUIT FOR A SHORT TO THE (Z909) GROUND CIRCUIT OR TO (P968) HEATED SEAT SENSOR RETURN CIRCUIT




1. Measure the resistance between the (P687) Left Front Heated Seat Temp Sense circuit and the (Z909) Ground circuit at the Left Seat Cushion Heater harness connector.
2. Measure the resistance between the (P687) Left Front Heated Seat Temp Sense circuit and the (P968) Heated Seat Sensor Return circuit at the Left 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 (P687) Left Front Heated Seat Temp Sense circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

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