• | 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 | 3 | -- |
Windshield Washer Pump Control | 1 | 1 | 2 | -- |
Windshield Washer Relay Control | 2 | 1 | B3873 00 | -- |
Windshield Washer Pump Ground | -- | 1 | -- | -- |
Windshield Wiper Switch Ground | -- | 3 | -- | -- |
1. Washers Inoperative 2. Washers Always On 3. Windshield Wiper System Malfunction |
The windshield washer function is controlled by the body control module (BCM). When the washer switch is pressed, ground is applied through the switch contacts and the signal circuit to the BCM indicating the wash request. The BCM then applies ground through the control circuit to the coil side of the WS WASH relay energizing the relay. With the relay energized, battery voltage is applied through the switch contacts of the relay, the WSW fuse, and the control circuit to the windshield washer fluid pump.
Wiper/Washer System Description and Operation
Control Module References for Scan Tool Information
Ignition ON, with a test lamp connected to ground, probe each of the test points on the WSW fuse while activating the Windshield Washer Switch. The test lamp should illuminate at one or both of the fuse test points.
⇒ | If the test lamp does not illuminate at either test point, refer to the Washer Switch Test. |
⇒ | If the test lamp illuminates, refer to the Washer Fluid Pump Test. |
⇒ | If not Active, test the following: |
• | Perform the multifunction switch component test. |
• | Test the windshield washer switch signal circuit for an open/high resistance. If the washer switch and circuit test normal, test or replace the body control module. |
⇒ | If the test lamp is always OFF, test the control circuit terminal H6 for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module. |
⇒ | If greater than 1 ohm, repair the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the underhood fuse block. |
⇒ | If the washer pump does not turn OFF, repair the short to voltage on the washer pump control circuit. |
⇒ | If not Inactive, test the following: |
• | Perform the multifunction switch component test. |
• | Test the windshield washer switch signal circuit for a short to ground. If the washer switch and circuit test normal, replace the body control module. |
⇒ | If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the body control module. |
⇒ | If the resistance is not within the specified range, replace the turn signal/multifunction switch. |
⇒ | If less than infinite ohms, replace the turn signal/multifunction switch. |
⇒ | If the less than infinite, replace the turn signal/multifunction switch. |
⇒ | If greater than 5 ohms, replace the turn signal/multifunction switch. |
⇒ | If less than infinite, replace the turn signal/multifunction switch. |
⇒ | If greater than 5 ohms, replace the turn signal/multifunction switch. |
Important: If the switch tests open in any switch position other than Off, test the wiper/washer switch signal circuits for a short to voltage before replacing the switch.
Switch Position | Resistance |
---|---|
Off | Infinite |
Mist | 300-364 Ω |
Delay 1 | 3.48K-4.25K Ω |
Delay 2 | 2.52K-3.08K Ω |
Delay 3 | 1.78K-2.18K Ω |
Delay 4 | 1.17K-1.44K Ω |
Delay 5 | 697-851 Ω |
Low | 2.52K-3.08K Ω |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |