• | 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 Ignition Voltage | 1 | 1 | -- | -- |
Windshield Washer Fluid Pump Control | 2 | 1 | -- | -- |
Windshield Washer Fluid Pump Ground | -- | 1 | -- | -- |
1. Washer Inoperative 2. Washers Always ON |
During windshield wiper/washer system WASH operation the wiper motor module controls the operating voltage to the wiper motor and the windshield washer pump. The WASH switch contact closes the wiper/washer switch accessory voltage supply circuit to the low circuit. Accessory voltage on the low circuit indicates to the wiper motor module the WASH command is active. When the wiper motor module activates the WASH function, the wiper motor accessory voltage supply circuit is closed to the wiper motor low speed terminal and the windshield washer pump control circuit for a minimum of 3.5 seconds or as long as the WASH command is active followed by 2 wiper motor cycles.
Wiper/Washer System Description and Operation
Control Module References for scan tool information
Turn ignition ON, operate the windshield washer switch. The washers should operate normally and low speed wipers should wipe 3 to 5 times for a mist washer cycle.
⇒ | If not the specified value, test the accessory voltage circuit for a short to ground or open/high resistance. |
⇒ | If not the specified value, test the accessory voltage circuit for a short to ground or open/high resistance. |
⇒ | If not the specified value, test the Low/Pulse/Delay signal circuit for a short to ground or open/high resistance. if all the circuits test normal replace the Windshield Wiper/Washer switch |
⇒ | If not the specified value, test the High Speed Control circuit for a short to ground or open/high resistance. if all the circuits test normal replace the Windshield Wiper/Washer switch |
⇒ | If not the specified value, test the controll circuit for a short to ground or an open/high resistance. |
⇒ | If not the specified value, test the ground circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the windshield wiper washer switch. |
⇒ | If not the specified value, replace the windshield wiper washer switch. |
⇒ | If greater than the specified range, replace the windshield wiper washer switch. |
⇒ | If the washer pump does not activate , replace the washer pump. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.