• | 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 battery voltage through the control circuit to the windshield washer fluid pump.
Wiper/Washer System Description and Operation
• | Circuit Testing |
• | Wiring Repairs |
Control Module References for Scan Tool Information
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal J for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If greater than the specified range test the ground circuit for an open/high resistance. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the BCM. |
⇒ | 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 |