B1021-13

B1021-13-FRONT WIPER HIGH SPEED - CIRCUIT OPEN / MOTOR THERMAL PROTECTION ACTIVE

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

Theory of Operation

The Body Control Module (BCM) receives a hardwired signal from the Right Multi-function Switch indicating that the high speed front wiper is requested. When this signal is received, the BCM provides a voltage output through the high speed front wiper motor control circuit. For additional information on the Front Wiper operation, Wipers And Washers - Operation.

- When Monitored:
With the ignition on.

Front Wiper on High Speed.

- Set Condition:
When the Body Control Module (BCM) detects less than expected current draw on the (W4) Front Wiper High Speed Driver circuit and does not detect any transitions of the Front Wiper Motor Park Switch for more than 10 seconds.





1. CHECK FOR AN INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. Turn the Front Wiper on High.
4. Wait for 10 seconds.
5. 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. CHECK THE (W4) FRONT WIPER HIGH SPEED DRIVER CIRCUIT FOR AN OPEN IN THE HARNESS
1. Turn the ignition off.
2. Disconnect the Front Wiper Motor harness connector.
3. Disconnect the BCM C4 harness connector.
4. Measure the resistance of the (W4) Front Wiper High Speed Driver circuit between the Front Wiper Motor harness connector and the BCM C4 harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 3

No

- Repair the open in the (W4) Front Wiper High Speed Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE (Z910) GROUND CIRCUIT FOR AN OPEN IN THE HARNESS
1. Using a 12-volt test light connected to 12-volts, check the (Z910) Ground circuit at the Front Wiper Motor harness connector.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the open in the (Z910) Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE BCM FOR CORRECT OPERATION
1. Turn the ignition off.
2. Reconnect the BCM C4 harness connector.
3. Connect a 12-volt test light between the (W4) Front Wiper High Speed Driver circuit and the (Z910) Ground circuit at the Front Wiper Motor harness connector.
4. Turn the ignition on.
5. Turn the High Speed Front Wiper on and off.

Does the test light illuminate correctly as the High Speed Front Wiper is commanded on and off?

Yes

- Replace the Front Wiper Motor. Front Wiper Motor - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the BCM. Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.