Wiper Park Switch Failure

Monitored & Set Condition

When Monitored: With the Wipers On, at any speed.
Set Condition: The BCM fails to detect a park signal from the wiper motor for 8 consecutive seconds.

Possible Causes:

Intermittent Condition
Front Wiper Park Switch Sense Circuit Short To Voltage
Front Wiper Park Switch Sense Circuit Open
Front Wiper Park Switch Sense Circuit Short To Ground
Ground Circuit Open
Wiper Motor
Body Control Module

Testing

Turn the ignition on. With the DRBIII(R), erase all BCM DTC's. Turn the Wipers on. With the DRBIII(R), read DTCs. Does the DRBIII(R) display: WIPER PARK SWITCH FAILURE? If yes, go to next step. If no, the condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires. Perform BODY VERIFICATION TEST .
Turn the ignition off. Disconnect the Front Wiper Motor harness connector. Disconnect the Junction Block C3 harness connector. Turn the ignition on. Measure the voltage of the Wiper Park Switch Sense circuit in the Front Wiper Motor harness connector. Is there any voltage present? If yes, repair the Wiper Park Switch Sense circuit for a short to voltage. Perform BODY VERIFICATION TEST . If no, go to next step.
Turn the ignition off. Measure the resistance of the Wiper Park Switch Sense circuit between the Junction Block C3 harness connector and the Wiper Motor harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the Front Wiper Park Switch Sense circuit for an open. Perform BODY VERIFICATION TEST .
Measure the resistance between ground and the Wiper Park Switch Sense circuit in the Junction Block C3 harness connector. Is the resistance below 100.0 ohms? If yes, repair the Front Wiper Park Switch Sense circuit for a short to ground. Perform BODY VERIFICATION TEST . If no, go to next step.
Using a 12-volt test light connected to 12 volts, test the Ground circuit in the Front Wiper Motor harness connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the Wiper Motor Ground circuit for an open. Perform BODY VERIFICATION TEST .
Turn the ignition on. Connect a jumper wire from the Wiper Park Switch Sense circuit to ground. With the DRBIII(R) in Inputs/Outputs read: Wiper Park Switch state. Did the Wiper Park Switch Input change state when connected to ground? If yes, replace the Wiper Motor. Perform BODY VERIFICATION TEST . If no, replace the Body Control Module. Perform BODY VERIFICATION TEST .