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Test 26A - Wiper System

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION  . For appropriate wiring diagram, see WIRING DIAGRAMS  at end of article.
  1. Turn ignition on. Attempt to operate windshield wipers in all modes. If wipers operate do not operate, go to step 7).
  2. If wipers operate, place wiper switch in high speed mode. If wipers do not operate properly in high speed mode, go to TEST 31A  .
  3. If wipers operate properly in high speed mode, place wiper switch in low speed mode. If wipers do not operate properly in low speed mode, go to TEST 32A  .
  4. If wipers operate properly in low speed mode, place wiper switch in intermittent mode. Check if wipers operate and park properly in intermittent mode. If wipers do not operate properly in intermittent mode, go to TEST 33A  .
  5. If wipers operate properly in intermittent mode, place wiper switch in off position. If wipers do not stop operating and park properly in the off position, go to TEST 33D  .
  6. If wipers stop operating and park properly in the off position, press and then release windshield washer button on end of wiper/washer stalk. If both the windshield washer pump and wiper motor do not operate, go to TEST 34A  . If both the windshield washer pump and wiper motor operate, the wiper system is operating properly. Perform VERIFICATION PROCEDURE VER-1.
  7. Using DRB-II, actuate wiper motor in low speed mode. If wiper motor operates in low speed mode, go to TEST 26B  . If wiper motor does not operate in low speed mode, go to next step.
  8. Stop wiper motor low speed mode actuation test. Using DRB-II, actuate wiper motor in high speed mode. If wiper motor operates in high speed mode, go to TEST 26C  .
  9. If wiper motor does not operate in high speed mode, stop high speed mode actuation test. Access Power Distribution Center (PDC). PDC is located on left front fender apron. Inspect "C" cartridge fuse in PDC. If fuse is blown, go to TEST 26C.
  10. If fuse is not blown, remove "C" cartridge fuse from PDC. With DRB-II in voltmeter mode, check voltage on "C" cartridge fuse connector battery feed circuit (Black wire). If voltage is less than 10 volts, repair open circuit in Black wire between "C" cartridge fuse and battery positive terminal. Perform VERIFICATION PROCEDURE VER-1.
  11. If voltage is more than 10 volts, install "C" cartridge fuse. Remove on/off wiper motor relay from PDC. With DRB-II in voltmeter mode, check voltage on on/off relay connector fused battery feed circuit (Red/Dark Blue wire). If voltage is less than 10 volts, repair open circuit in Red/Dark Blue wire between "C" cartridge fuse and on/off relay. Perform VERIFICATION PROCEDURE VER-1.
  12. If voltage is more than 10 volts, connect jumper wire between fused battery feed circuit (Red/Dark Blue wire) and common drive circuit (Light Green/Black wire) on on/off wiper motor relay cavities. If wiper motor operates, go to TEST 27A.
  13. If wiper motor does not operate, remove high/low wiper motor relay from PDC. Ensure jumper wire is still connected between fused battery feed circuit (Red/Dark Blue wire) and common drive circuit (Light Green/Black wire) on on/off wiper motor relay cavities. With DRB-II in voltmeter mode, check voltage on high/low relay connector common drive circuit (Light Green/Black wire). If voltage is less than 10 volts, repair open circuit in Light Green/Black wire between on/off relay and high/low relay. Perform VERIFICATION PROCEDURE VER-1.
  14. If voltage is more than 10 volts, remove jumper wire from on/off wiper motor relay cavities. Connect jumper wire between fused battery circuit (Red/Dark Blue wire) on on/off relay connector and low speed output circuit (Brown/White wire) on high/low relay connector. If wiper motor does not operate in low speed mode, go to TEST 28A  .
  15. If wiper motor operates in low speed mode, remove jumper wire from on/off relay and high/low relay cavities. With DRB-II in voltmeter mode, check voltage on on/off relay connector ignition feed circuit (Dark Blue wire). If voltage is less than 10 volts, go to TEST 29A  .
  16. If voltage is more than 10 volts, use DRB-II to actuate wiper motor in low speed mode. With DRB-II in voltmeter mode, check voltage on on/off relay connector relay control circuit (Dark Green/Yellow wire). If voltage does not pulsate between zero and more than 0.2 volt, go to step 18).
  17. If voltage pulsates between zero and more than 0.2 volt, install on/off wiper motor relay on PDC. With DRB-II in voltmeter mode, check voltage on high/low relay connector common drive circuit (Light Green/Black wire). If voltage does not pulsate between zero and battery voltage, replace on/off relay. Perform VERIFICATION PROCEDURE VER-1. If voltage pulsates between zero and battery voltage, high/low relay. Perform VERIFICATION PROCEDURE VER-1.
  18. Access Body Controller Module (BCM). Module is located behind right kick panel. Using DRB-II, actuate wiper motor in low speed mode. With DRB-II in voltmeter mode, backprobe BCM Gray connector terminal No. 1, wiper on/off relay control circuit (Dark Green/Yellow wire). If voltage pulsates between zero and more than 0.2 volt, repair open circuit in Dark Green/Yellow wire between BCM and on/off wiper motor relay. Perform VERIFICATION PROCEDURE VER-1. If voltage does not pulsate between zero and more than 0.2 volt, replace BCM. Perform VERIFICATION PROCEDURE VER-1.
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