• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Windshield Washer Switch Signal | 2 | 1 | 1 | -- |
Windshield Washer Fluid Pump Control | 1 | 1 | 2 | -- |
Windshield Washer Relay Control | 2 | 1 | B3873 00 | -- |
Windshield Washer Fluid Pump Ground | -- | 1 | -- | -- |
1. Washer Inoperative 2. Washers Always ON |
The body control module (BCM) controls the washer motor based on an input from the windshield wiper washer switch. The BCM monitors the washer switch through the windshield washer switch signal circuit. When the WASH switch is closed, ground is supplied to the windshield washer switch signal circuit. When this is seen, the BCM will command the windshield washer fluid pump and the low speed wipers on.
A washer request is present
A short to voltage is detected in the windshield washer relay control circuit
Washer operation is suspended
• | A current DTC will clear when the condition for setting the fault is no longer seen |
• | A history DTC will clear after 50 consecutive ignition cycles without a fault present |
Wiper/Washer Connector End Views
Wiper/Washer System Description and Operation
Operate the washers using the WASH switch. Verify the washer pump activates.
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for BCM replacement, programming, and setup