B1094

B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN - RHD

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

- When Monitored:
During heated seat operation.

- Set Condition:
The Heated Seat Module (HSM) detects an open or high voltage condition.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all DTC's.
3. Operate the Heated Seat Switch in both positions several times.
4. With the scan tool, read DTCs.

Does the scan tool display active: B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform BODY VERIFICATION TEST. Body Verification Test.

2. (P187) LEFT SEAT HEATER B(+) CIRCUIT SHORTED TO VOLTAGE
1. Disconnect the Heated Seat Module harness connector.

NOTE: Check connectors - Clean and repair as necessary.

2. Turn the ignition on.
3. Measure the voltage on the (P187) Left Seat Heater B(+) Driver circuit at the Heated Seat Module harness connector.

Is there voltage above 0.5 volts?

Yes

- Repair the (P187) Left Seat Heater B(+) Driver circuit for a short to voltage.
- Perform BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. (P187) LEFT SEAT HEATER B(+) DRIVER CIRCUIT OPEN
1. Reconnect the Heated Seat Module connector.
2. Disconnect the passenger seat C378 10 way harness connector.

NOTE: Check connectors - Clean and repair as necessary.

3. Connect a test light between the (Z908) Seat Heater ground circuit and the (P187) Left Seat Heater B(+) Driver circuit at the passenger seat C378 10 way harness connector.
4. Turn the ignition on.
5. Operate the Heated Seat Switch in both positions several times.

Does the test light illuminate brightly when the switch is on?

Yes

- Check the heater wiring in the passenger seat harness for an open, if OK replace the open seat heater element(s).
- Perform BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. (P187) LEFT SEAT HEATER B(+) DRIVER CIRCUIT OPEN
1. Disconnect the Heated Seat Module harness connector.
2. Measure the resistance of the (P187) Left Seat Heater B(+) Driver circuit at the passenger seat 10 way harness connector to the Heated Seat Module harness connector.

Is the resistance above 2.0 ohms?

Yes

- Repair the (P187) Left Seat Heater B(+) Driver circuit for an open.
- Perform BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. (Z908) SEAT HEATER GROUND CIRCUIT OPEN
1. Using a 12-volt test light connected to 12-volts, check the (Z908) Seat Heater Ground circuit at the passenger seat 10 way harness connector.

Does the test light illuminate brightly?

Yes

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

No

- Repair the open or excessive resistance in the (Z908) Seat Heater ground circuit.
- Perform BODY VERIFICATION TEST. Body Verification Test.