B1EB1-1B

B1EB1-1B-FRONT LEFT SEAT HEATER SENSOR - CIRCUIT RESISTANCE ABOVE 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 above 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 operating all HSM functions one at a time. 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 FOR A SHORT TO VOLTAGE




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

NOTE: Check connectors. Clean and repair as necessary.

3. Start the engine and let it run.
4. Measure the voltage of the (P687) Left Front Heated Seat Temp Sense circuit between the HSM C2 harness connector and ground.

Is there any voltage present?

Yes

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

No

- Go To 3

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




1. Measure the voltage of the (P687) Left Front Heated Seat Temp Sense circuit between the HSM C2 harness connector and ground while adjusting the seat in all positions.

Is there any voltage present during the seat adjustment?

Yes

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

No

- Go To 4

4. CHECK (P687) LEFT FRONT HEATED SEAT TEMP SENSE CIRCUIT VOLTAGE TO LEFT SEAT CUSHION HEATER




1. Reconnect the HSM C2 harness connector.
2. Start the engine and let it run.
3. Measure the voltage 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 Voltage above 4.5 volts?

Yes

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

No

- Go To 5

5. CHECK (P687) LEFT FRONT HEATED SEAT TEMP SENSE CIRCUIT OR AN OPEN




1. Turn the ignition off.
2. Disconnect the HSM C2 harness connector.
3. Measure the resistance of the (P687) Left Front Heated Seat Temp Sense circuit between the HSM C2 connector and the Left Seat Cushion Heater connector (harness side).

Is the resistance below 5.0 Ohms?

Yes

- Go To 6

No

- Repair the (P687) Left Front Heated Seat Temp Sense circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

6. CHECK (P968) HEATED SEAT SENSOR RETURN CIRCUIT FOR AN OPEN




1. Measure the resistance of the (P968) Heated Seat Sensor Return circuit between the HSM C2 harness connector and the Left Seat Cushion Heater harness connector.

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 (P968) Heated Seat Sensor Return circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.