Wiper and Washer Systems: Testing and Inspection

Diagnosis of the Winshield Wiper System

Refer to the following images to diagnose the system. A diagnostic tool J34660-A Wiper Tester and adapter J34660-400 may also be used to diagnose the wiper system. Follow the instructions that came with the tool to properly perform the diagnosis.

Use these diagrams as aid for diagnosis:

Wiper Motor Circuit Diagrams:

Wiper and Washer On-Vehicle Checks:

Wiper Motor On-vehicle Checks:

Washer Pump On-Vehicle Check:

Wiper/Washer Switch Tests:

Wiper/Washer Switch Tests:

Wiper Diagnosis:

Procedure 1: Washer Pump Inoperative, Wiper Motor Operates:

Procedure 2: Washer Pumps Continuously:

Procedure 3: Wiper Motor Inoperative:

Procedure 4: "Lo" Speed Only, Inoperative In "Hi":

Procedure 5: "Hi" Speed Only, Inoperative In "Lo":

Procedure 6: One Speed Only, Runs The Same In "Lo" And "Hi":

Procedure 7: Wiper Shuts Off But Blades Don't Park:

Procedure 8: Wiper Will Not Shut Off:

Procedure 9: Intermittent Operation, Wiper Has Both Speeds:

Procedure 10: Wiper Motor Runs But Blades Won't Move:

Procedure 11: Wiper Parks Above Normal Position: