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Home >> Saturn >> 2007 >> Sky Base, Automatic >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Wiper/Washer Systems >> Wipers System And Washer System >> Diagnostic Information and Procedures >> Windshield Wiper Washer System Malfunction >> Circuit/System Testing

Circuit/System Testing

Windshield Wiper Switch Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the windshield wiper switch.
  2. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance.
  3. Verify the scan tool Windshield Wiper Switch parameter is Off.
    • If not Off, test the signal circuit terminal E for a short to voltage. If the circuit tests normal, replace the body control module.
  4. Install a 3-amp fused jumper wire between the signal circuit terminal E and battery voltage. Verify the scan tool Windshield Wiper Switch parameter is Low/Mist/Hi.
    • If not Low/Mist/Hi, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the body control module.
  5. Ignition Off, remove the WPR 52 high relay at the underhood fuse block.
  6. Place the wiper switch in the high speed position.
  7. Verify that a test lamp illuminates between the wiper switch high signal circuit terminal 86 and ground.
    • If the test lamp does not illuminate, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the windshield wiper/washer switch.
  8. If all circuits test normal, test or replace the windshield wiper switch.

Wiper Motor Circuit/System Testing

  1. Ignition OFF, remove the WPR 70 On/Off relay at the underhood fuse block.
  2. Test for less than 5.0 ohms of resistance between the ground circuit terminal 85 and ground.
    • If greater than 5.0 ohms, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a lest lamp illuminates between the B+ terminal 87 and ground.
    • If the test lamp does not illuminate, test the WPR Fuse 59 for an open. If the fuse tests normal, replace the underhood fuse block.
  4. Connect a test lamp between the relay control circuit terminal 86 and ground.
  5. Activate the wiper MIST switch ON and OFF. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the body control module.
    • 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, replace the body control module.
  6. Ignition OFF, install the WPR 70 On/Off relay.
  7. Remove the WPR 52 high relay at the underhood fuse block.
  8. Ignition OFF, test for less that 5.0 ohms of resistance between the wiper relay ground circuit terminal 85 and ground.
    • If greater than 5.0 ohms, test the ground circuit for an open/high resistance.
  9. Connect a test lamp between the control circuit terminal 30 and ground.
  10. Ignition ON, activate the wiper MIST switch ON and OFF. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp does not illuminate, replace the WPR 70 On/Off relay.
  11. Place the wiper switch in the HIGH speed position. Verify that a test lamp illuminates between the wiper switch high signal circuit terminal 86 and ground.
    • If the test lamp does not illuminate, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the windshield wiper/washer switch.
  12. Ignition OFF, install the WPR 52 high relay.
  13. Ignition OFF, disconnect the harness connector at the windshield wiper motor.
  14. Test for less than 5.0 ohms of resistance between the ground circuit terminal 1 and ground.
    • If greater than 5.0 ohms, test the ground circuit for an open/high resistance.
  15. Ignition ON, place the switch in the LOW speed position. Verify that a test lamp illuminates between the low speed control circuit terminal 5 and ground.
    • 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, replace the WPR 52 high relay.
  16. Place the switch in the HIGH speed position. Verify that a test lamp illuminates between the high speed control circuit terminal 4 and ground.
    • 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, replace the WPR 52 high relay.
  17. If all circuits test normal, replace the windshield wiper motor.

Wipers Do Not Park Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the windshield wiper motor.
  2. Ignition ON, verify the scan tool BCM Wiper Park Switch parameter is Inactive.
    • If not Inactive, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, test or replace the body control module.
  3. Install a 3-amp fused jumper wire between the wiper motor park switch signal circuit terminal 2 and ground. Verify the scan tool Wiper Park Switch parameter is Active.
    • If not Active, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the body control module.
  4. If all circuits test normal, test or replace the windshield wiper motor.
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