B121B

B121B-RIGHT HEATED SEAT HI INDICATOR CONTROL CIRCUIT OPEN





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

- When Monitored:
Continuously with the ignition on.

- Set Condition:
This code sets immediately when the Cluster detects low Voltage on the (P84) Right Heated Seat High Indicator Driver circuit.





1. CHECK FOR AN ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)
1. Turn the ignition on.
2. Operate the Heated Seat Switch in both positions several times.
3. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST Body Verification Test.

2. INSPECT FOR OPEN PDC FUSE # 40
1. Turn the ignition off.
2. Check PDC fuse # 40.

Is the fuse open?

Yes

- Check for a possible short to ground on the (F23) Fused Run/Start Relay Output circuit. Reinstall or replace the fuse as necessary.
- Perform the BODY VERIFICATION TEST Body Verification Test.

No

- Go To 3

3. CHECK (F23) FUSED RUN/START RELAY OUTPUT CIRCUIT FOR AN OPEN




1. Disconnect the Right Heated Seat Switch connector.

NOTE: Check connectors. Clean and repair as necessary.

2. Turn the ignition on.
3. Measure the Voltage of the (F23) Fused Run/Start Relay Output circuit between the Right Heated Seat Switch connector and ground.

Is the Voltage above 10.0 Volts?

Yes

- Go To 4

No

- Repair the (F23) Fused Run/Start Relay Output circuit for an open.
- Perform the BODY VERIFICATION TEST Body Verification Test.

4. CHECK THE (P84) RIGHT HEATED SEAT HIGH INDICATOR DRIVER CIRCUIT VOLTAGE AT CLUSTER




1. Turn the ignition off.
2. Reconnect the Right Heated Seat Switch connector.
3. Disconnect the Cluster C3 connector.

NOTE: Check connectors. Clean and repair as necessary.

4. Turn the ignition on.
5. Measure the Voltage of the (P84) Right Heated Seat High Indicator Driver circuit between the Cluster C3 connector and ground.

Is the Voltage above 10.0 Volts?

Yes

- Replace the Cluster.
- Perform the BODY VERIFICATION TEST Body Verification Test.

No

- Go To 5

5. CHECK (P84) RIGHT HEATED SEAT HIGH INDICATOR DRIVER CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the Right Heated Seat Switch connector.
3. Measure the resistance of the (P84) Right Heated Seat High Indicator Driver circuit between ground and the Right Heated Seat Switch connector.

Is the resistance below 10K ohms?

Yes

- Repair the (P84) Right Heated Seat High Indicator Driver circuit for a short to ground.
- Perform the BODY VERIFICATION TEST Body Verification Test.

No

- Go To 6

6. CHECK (P84) RIGHT HEATED SEAT HIGH INDICATOR DRIVER CIRCUIT FOR A SHORT TO (Z909) GROUND CIRCUIT




1. Measure the resistance between the (P84) Right Heated Seat High Indicator Driver circuit and the (Z909) Ground circuit at the Right Heated Seat Switch connector.

Is the resistance below 10K ohms?

Yes

- Repair the (P84) Right Heated Seat High Indicator Driver circuit for a short to the (Z909) Ground circuit.
- Perform the BODY VERIFICATION TEST Body Verification Test.

No

- Go To 7

7. CHECK (P84) RIGHT HEATED SEAT HIGH INDICATOR DRIVER CIRCUIT FOR AN OPEN




1. Measure the resistance of the (P84) Right Heated Seat High Indicator Driver circuit between the Cluster C3 connector and the Right Heated Seat Switch connector.

Is the resistance below 5.0 ohms?

Yes

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

No

- Repair the (P84) Right Heated Seat High Indicator Driver circuit for an open.
- Perform the BODY VERIFICATION TEST Body Verification Test.