Wipers Run Continuously With Ignition on

POSSIBLE CAUSES
- Multi-function switch
- Wiper motor circuit short to voltage
- Body control module

Diagnostic Test




1. MEASURE MULTI-FUNCTION SWITCH VOLTAGE

NOTE: If any BCM DTCs are set, diagnose them first before continuing.

Turn the ignition off.
Disconnect the Multi-Function Switch harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Connect a fused jumper wire from B(+) to cavity 11 of the Multi-Function Switch.

Measure the voltage of the Wiper Switch Mux circuit at cavity 7 of the Multi-Function Switch harness connector.

Q: Is voltage present?

YES: Replace the Multi-Function Switch. Perform BODY VERIFICATION TEST. Verification Tests
NO: Go to 2




2. MEASURE WIPER SWITCH MUX CIRCUIT VOLTAGE

Disconnect the jumper wire. Disconnect the BCM harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Wiper Switch Mux circuit at cavity 7 of the Multi-Function Switch harness connector.

Q: Is voltage present?

YES: Repair the Wiper Switch Mux circuit for a short to voltage. Perform BODY VERIFICATION TEST. Verification Tests
NO: Replace the Body Control Module. Perform BODY VERIFICATION TEST. Verification Tests