Washers Run Continuously With Ignition on

WASHERS RUN CONTINUOUSLY WITH IGNITION ON

Washers Run Continuously With Ignition On:

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

DIAGNOSTIC TEST

1. MEASURE MULTI-FUNCTION SWITCH RESISTANCE





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

Disconnect the BCM harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Disconnect the Multi-Function Switch harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.
Measure the voltage of the Washer Pump Motor Control circuit at cavity 8 of the Multi-Function Switch harness connector.

Q: Is voltage present?

YES: Repair the Washer Pump Motor Control circuit for an open. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Go to 2

2. MEASURE MULTI-FUNCTION SWITCH RESISTANCE





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.

Measure the resistance of the Multi-Function Switch between cavity 8 and cavity 11.
While measuring the resistance, depress the washer switch once and release.

Q: Did the resistance reading go from infinite to less than 5 ohms to infinite?

YES: Replace the Body Control Module. Perform BODY VERIFICATION TEST. Body Verification Test
NO: Replace the Multi-Function Switch. Perform BODY VERIFICATION TEST. Body Verification Test