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Wipers Run Constantly With Ignition On

  1. Ensure ignition is on and wiper switch is off. Using scan tool, read intermittent wiper voltage. If scan tool displays a voltage of greater than 0.5 volts, go to next step. If scan tool displays a voltage less than 0.5 volts, go to step  4.
  2. Turn ignition off. Disconnect BCM 22-pin connector C3. See Figure. Ensure connector is clean and not damaged. Using DVOM, measure voltage between ground and BCM 22-pin connector C3 terminal No. 10 (Dark Green/Yellow wire). See CONNECTOR IDENTIFICATION . Turn ignition on. If voltage is greater than 0.5 volt, go to next step. If voltage is 0.5 volt or less, replace BCM. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION.
  3. Turn ignition off. Disconnect multifunction switch 7-pin connector C1. See Figure. Using DVOM, measure voltage between ground and BCM 22-pin connector C3 terminal No. 10 (Dark Green/Yellow wire). Turn ignition on. If voltage is greater than 0.5 volt, repair short to battery voltage on Dark Green/Yellow wire. If voltage is 0.5 volt or less, replace multifunction switch. See appropriate STEERING COLUMN SWITCHES article.
  4. Turn ignition off. Remove intermittent wiper relay and replace original wiper relay with a known-good relay. See Figure. Turn ignition on. If wipers still run constantly, go to next step. If wipers do not run constantly, replace intermittent wiper relay.
  5. Turn ignition off while wipers are in mid-sweep. Disconnect BCM 14-pin connector C1. Ensure connector is clean and not damaged. Using DVOM, measure resistance between ground and BCM 14-pin connector C1 terminal No. 2 (Tan/Red wire). See CONNECTOR IDENTIFICATION . If resistance is below 100 ohms, go to next step. If resistance is greater than 100 ohms, go to step  7.
  6. With DVOM connected as in previous step, disconnect wiper motor Light Gray 4-pin connector and ensure connector is clean and not damaged. If resistance is below 100 ohms, repair short to ground in Tan/Red wire between BCM and wiper motor. If resistance is greater than 100 ohms, replace wiper motor. See appropriate WIPER/WASHER SYSTEMS article.
  7. Turn ignition off. Remove known-good intermittent wiper relay. Using DVOM, measure resistance between ground and BCM 14-pin connector C1 terminal No. 7 (Pink/Violet wire). If resistance is less than 100 ohms, repair short to ground in Pink/Violet wire. If resistance is 100 ohms or greater, go to next step.
  8. Reconnect BCM and install intermittent relay. Disconnect wiper motor Light Gray 4-pin connector. Select MONITOR DISPLAY, WIPER SYSTEM on scan tool and monitor wiper park switch. Connect a jumper wire between ground and wiper motor Light Gray 4-pin connector terminal "D" (Tan/Red wire). See Figure. If scan tool does not display SWITCH: CLOSED, go to next step. If scan tool displays, SWITCH: CLOSED, replace wiper motor. See appropriate WIPER/WASHER SYSTEMS article.
  9. Monitor wiper park switch on scan tool. Access BCM 14-pin connector C1 but do not disconnect. Connect a jumper wire to ground. Backprobe BCM 14-pin connector C1 terminal No. 2 (Tan/Red wire) with other end of jumper wire. If scan tool displays, SWITCH: CLOSED, repair open in Tan/Red wire between wiper motor and BCM. If scan tool does not display SWITCH: CLOSED, replace BCM. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION.
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