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Front Wipers Not Working At All

NOTE: For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST VER-1A  after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Using scan tool, actuate front wiper relay. If wiper motor does not operate in low speed mode, go to step  7 . If wiper motor operates in low speed mode, go to next step.
  2. Stop wiper motor actuation. Ensure ignition is on. Turn wiper switch to LO position. Using scan tool, select SENSORS and read intermittent wiper voltage. If scan tool does displays INTRMT WIPE: 2.5V or less, go to next step. If scan tool displays more than INTRMT WIPE: 2.5V, replace Body Control Module (BCM). BCM is located with junction block under driver's side instrument panel. See Figure .
  3. Turn ignition off. Disconnect Body Control Module (BCM) connector "A". Using scan tool in voltmeter mode, measure voltage at BCM connector "A" terminal No. 7 (Dark Green/Yellow wire). If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, replace BCM.
  4. Disconnect multifunction switch 12-pin connector. See Figure . Ensure connector is clean and not damaged. Using an external voltmeter, measure voltage between ground and multifunction switch connector terminal No. 7 (Dark Blue wire). If voltage is 10 volts or less, repair open Dark Blue wire. If voltage is more than 10 volts, go to next step.
  5. Turn ignition off. Using an external ohmmeter, measure resistance between ground and multifunction switch connector terminal No. 6 (Dark Green/Yellow wire). If resistance is less than 5 ohms, repair Dark Green/Yellow wire for short to ground. If resistance is 5 ohms or more, go to next step.
  6. Turn ignition on. Connect jumper wire between multifunction switch connector terminals No. 6 and 7. Using an external voltmeter, measure voltage between ground and BCM connector "A" terminal No. 7 (Dark Green/Yellow wire). If voltage is 10 volts or less, repair open Dark Green/Yellow wire. If voltage is more than 10 volts, replace multifunction switch.
  7. Using scan tool, stop front wiper low speed actuation. Locate Power Distribution Center (PDC) on left front fender next to battery. Remove and inspect wiper fuse No. 19 (30-amp). See Figure . If fuse is okay, go to step  12 . If fuse is open, go to next step.
  8. Remove front wiper ON relay from Power Distribution Center (PDC). Ensure connector is clean and not damaged. Remove HI/LO wiper relay and ensure connector is clean and not damaged. Using an external ohmmeter, measure resistance between ground and front wiper ON relay socket terminal No. 87. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, replace PDC.
  9. Using an external ohmmeter, measure resistance between ground and front wiper ON relay socket terminal No. 30. If resistance is more than 5 ohms, go to next step. If resistance is less than 5 ohms, replace PDC.
  10. Disconnect wiper module connector. See Figure . Using an external ohmmeter, measure resistance between ground and wiper HI/LO relay socket terminal No. 87A. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Brown/White wire between terminal No. 1 on wiper module connector and wiper HI/LO relay socket terminal No. 87A. Replace wiper fuse No. 19 (30-amp).
  11. Using an external ohmmeter, measure resistance between ground and wiper HI/LO relay socket terminal No. 87. If resistance is less than 5 ohms, repair short to ground in Red/Yellow wire between wiper HI/LO relay socket terminal No. 87 and wiper module connector terminal No. 3. Replace wiper fuse No. 19 (30-amp). If resistance is 5 ohms or more, replace wiper motor and wiper fuse No. 19 (30-amp).
  12. Using an external voltmeter, measure voltage between ground and outside terminal (fused B+) on fuse No. 19 socket. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair or replace PDC.
  13. Reinstall wiper fuse No. 19. Remove front wiper ON relay from PDC and ensure connector is clean and not damaged. Using an external voltmeter, measure voltage between ground and front wiper ON relay socket terminal No. 87. See Figure . If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair or replace PDC.
  14. Connect a jumper wire between wiper ON relay socket terminals No. 30 and 87. If wiper motor operates, disconnect jumper wire and go to next step. If wiper motor does not operate, go to step  18 .
  15. Using an external voltmeter, measure voltage between ground and front wiper ON relay socket terminal No. 86. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair or replace Power Distribution Center (PDC).
  16. Reinstall wiper ON relay. Access Body Control Module (BCM) connector "B". BCM is located with junction block under driver's side instrument panel. See Figure . Remove connector cover. Do not disconnect connector. Connect jumper wire between ground and BCM connector "B" terminal No. 73 (Red/Violet wire). If wiper motor operates, replace BCM. If wiper motor does not operate, go to next step.
  17. Remove wiper ON relay. Do not disconnect jumper wire. Using an external ohmmeter, measure resistance between ground and front wiper ON relay socket terminal No. 85. If resistance is less than 5 ohms, replace relay. If resistance is 5 ohms or more, repair open Red/Violet wire between BCM and front wiper ON relay socket.
  18. Disconnect wiper HI/LO relay, located in PDC. Ensure connector is clean and not damaged. Ensure jumper wire is still connected between wiper ON relay socket terminals No. 30 and 87. Using an external voltmeter, measure voltage between ground and wiper HI/LO relay socket terminal No. 30. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair or replace PDC.
  19. Disconnect jumper wire from front wiper ON relay socket. Connect a jumper wire between wiper ON relay socket terminal No. 87 and wiper HI/LO relay terminal No. No. 87A. If wiper motor operates in low speed mode, replace wiper HI/LO relay. If wiper motor does not operate in low speed mode, go to next step.
  20. Disconnect wiper module connector. See Figure . Ensure jumper wire between wiper ON relay socket terminals No. 30 and 87 is connected. Using an external voltmeter, measure voltage between ground and wiper module terminal No. 1 (Brown/White wire). If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open in Brown/White wire between HI/LO wiper relay and wiper motor module.
  21. Ensure ignition is off. Ensure all lights and accessories are off. Using an external ohmmeter, measure resistance between ground and wiper module terminal No. 4 (Black wire). If resistance is less than 5 ohms, replace wiper motor. If resistance is 5 ohms or more, repair open Black wire.
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