B1123-64

B1123-64-REAR WIPER - SIGNAL PLAUSIBILITY FAILURE

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

Theory of Operation

The Body Control Module (BCM) monitors the operation of the Rear Wiper Motor with a wiper park switch that is integral to the Wiper Motor. The Wiper Park Switch switches the signal circuit to ground when the wiper motor is in the park position. For additional information on the Rear Wiper operation, Rear.

- When Monitored:
With the ignition on.

Rear Wiper on.

- Set Condition:
The Body Control Module (BCM) does not detect any Rear Wiper Park Switch transitions for more than five seconds, while the Rear Wiper Motor current draw is within normal limits.





1. INTERMITTENT CONDITION

NOTE: Prior to diagnosing this DTC, verify the Rear Wiper Arm is free of obstructions and correctly attached to the Rear Wiper Motor output shaft.

1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. Turn the Rear Wiper on.
4. Wait 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 (W17) REAR WIPER PARK SWITCH SENSE CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Rear Wiper Motor harness connector.
3. Disconnect the BCM C2 harness connector.
4. Measure the resistance of the (W17) Rear Wiper Park Switch Sense circuit between the Rear Wiper Motor harness connector and the BCM C2 harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 3

No

- Repair the open in the (W17) Rear Wiper Park Switch Sense circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE (W17) REAR WIPER PARK SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (W17) Rear Wiper Park Switch Sense circuit at the Rear Wiper Motor harness connector.

Is the resistance above 10k Ohms?

Yes

- Go To 4

No

- Repair the short to ground in the (W17) Rear Wiper Park Switch Sense 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 C2 harness connector.
3. Connect a jumper wire between ground and the (W17) Rear Wiper Park Switch Sense circuit at the Rear Wiper Motor harness connector.
4. Turn the ignition on.
5. With the scan tool, read the Rear Wiper Park Switch Sense status.

Does the scan tool display the status as Parked?

Yes

- Replace the Rear Wiper Motor. Rear 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.