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Test D: Wipers Inoperative In All Modes

WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. If wiper/washer system description and operation, and preliminary inspection has been reviewed, and necessary inspections have been performed, go to next step. See DESCRIPTION  , OPERATION  & PRELIMINARY INSPECTION  under TROUBLE SHOOTING.
  2. Turn ignition switch to RUN position. Cycle wiper/washer switch through all switch positions. If wiper/washer system does not operate normally, go to next step. If wiper/washer system operates normally, concern my be intermittent. For aid in diagnosing intermittents, see PRELIMINARY INSPECTION  under TROUBLE SHOOTING.
  3. Disconnect windshield wiper motor 6-pin harness connector. Windshield wiper motor is located in cowling at left front of engine compartment. Using a test light connected to ground, probe windshield wiper motor harness connector terminal "D" (Brown wire), windshield wiper switch pulse delay signal circuit. See Figure . Turn ignition switch to RUN position. If test light illuminates, go to next step. If test light does not illuminate, go to step  6 .
  4. Using a test light connected to ground, probe windshield wiper motor harness connector terminal "B" (Yellow wire), accessory voltage supply circuit. See Figure . Turn ignition switch to RUN position. If test light illuminates, go to next step. If test light does not illuminate, go to step  8 .
  5. Connect test light to ground circuit terminal in wiper motor harness connector and the accessory voltage supply circuit terminal. If test light does not illuminate, go to step  9 . If test light illuminates, go to step  13 .
  6. Test windshield wiper switch low circuit for an open or short to ground. If condition is found, repair as necessary and go to step  15 . If no condition is found, go to next step.
  7. Test accessory voltage supply circuit to windshield wiper/washer switch for an open or short to ground. If condition is found, repair as necessary and go to step  15 . If no condition is found, go to step  10 .
  8. Repair necessary voltage supply circuit for an open or high resistance. After repair is complete go to step  15 .
  9. Repair windshield wiper motor ground circuit for an open or high resistance. After repair is complete go to step  15 .
  10. Test windshield wiper motor high speed circuit for a short to ground. If condition is found, repair as necessary and go to step  15 . If no condition is found, go to next step.
  11. Inspect windshield wiper/washer switch for poor connections. If condition is found, repair as necessary and go to step  15 . If no condition is found, go to next step.
  12. Replace windshield wiper/washer switch. See WINDSHIELD WIPER/WASHER SWITCH  under REMOVAL & INSTALLATION. After repairs are made, go to step  15 .
  13. Inspect windshield wiper motor for poor connections. If condition is found, repair as necessary and go to step  15 . If no condition is found, go to next step.
  14. Replace the windshield wiper motor. See WIPER MOTOR  under REMOVAL & INSTALLATION. After repairs are made, go to next step.
  15. Operate wiper/washer system to verify repairs. If system operates normally, testing is complete. If system does not operate normally, go to step  3 .
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