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Test L: Rear Wiper Does Not Operate Properly

NOTE: After all repairs, clear Diagnostic Trouble Codes (DTC) and recheck system operation. See WIRING DIAGRAMS  for circuit identification and repair.
  1. Connect New Generation Star (NGS) tester to Data Link Connector (DLC) located under left side of instrument panel. Retrieve and note continuous DTCs stored in Generic Electronic Module/Central Timer Module (GEM/CTM). Clear continuous DTCs. Following NGS tester manufacturer's instructions, perform wiper/washer self-test and rear wiper self-test. Note all DTCs. If DTCs are retrieved, go to appropriate test step. See TEST L DTC INDEX  table. If no DTCs are retrieved, go to next step.
    TEST L DTC INDEX

    DTC Go To Step
    B1342 (1)
    B1611  2
    B1614  2
    B1839  6
    B1894  6
    (1) Replace GEM/CTM. See GENERIC ELECTRONIC MODULE/CENTRAL TIMER MODULE  under REMOVAL & INSTALLATION. Clear DTCs and recheck system operation.
  2. Monitor GEM PID R_WP_MD while turning rear wiper switch through all positions. If GEM PID R_WP_MD values do not agree with switch positions, go to next step. If GEM PID R_WP_MD values agree with switch positions, go to step  6 .
  3. Turn ignition switch to LOCK position. Disconnect rear wiper switch 6-pin harness connector C249. Measure resistance between rear wiper switch terminals No. 2 and 5 (component side) while moving rear wiper switch through all positions. See Figure . See REAR WIPER SWITCH RESISTANCE TEST  table. If resistance is as specified, go to next step. If resistance is not as specified, replace rear wiper switch. See REAR WIPER SWITCH  under REMOVAL & INSTALLATION.
    REAR WIPER SWITCH RESISTANCE TEST

    Switch Position Ohms
    Off 4200-9100
    First Interval Delay 1000-2420
    Second Interval Delay 220-950
    High 50-230
  4. Disconnect GEM 16-pin harness connector C281. GEM/CTM is located behind center of instrument panel finish panel. Measure resistance between ground and rear wiper/washer switch harness connector C249 terminal No. 2 (Pink/Black wire). See Figure . If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Pink/Black wire between GEM and rear wiper/washer switch.
  5. Measure resistance of Gray/Red wire between rear wiper/washer switch harness connector C249 terminal No. 5 and GEM/CTM harness connector C280 terminal No. 21. See Figure and Figure . If resistance is more than 5 ohms, repair open or high resistance in Gray/Red wire. If resistance is 5 ohms or less, replace GEM. See GENERIC ELECTRONIC MODULE/CENTRAL TIMER MODULE  under REMOVAL & INSTALLATION.
  6. Monitor GEM PID R_WP_PK. Move wiper arm to center of liftgate glass by triggering active commands REAR WIPER UP RELAY and REAR WIPER DOWN RELAY ON and OFF. GEM PID R_WP_PK should indicate PARKED when wiper arm is parked, and indicate notPARKED when arm is in center of glass. If GEM PID R_WP_PK value is not as specified, go to next step. If GEM PID R_WP_PK value is as specified, replace rear wiper motor. See REAR WIPER MOTOR  under REMOVAL & INSTALLATION.
  7. Turn ignition switch to LOCK position. Disconnect rear wiper motor 4-pin harness connector C417 and GEM/CTM 16-pin harness connector C281. GEM/CTM is located behind center of instrument panel finish panel. Measure resistance of Violet/Yellow wire between GEM harness connector C281 terminal No. 4 and rear wiper motor harness connector C417 terminal No. 3. See Figure and Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open or high resistance in Violet/Yellow wire.
  8. Measure resistance between ground and GEM harness connector C281 terminal No. 4 (Violet/Yellow wire). If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short to ground in Violet/Yellow wire between GEM and rear wiper motor.
  9. Measure resistance between ground and rear wiper motor harness connector C417 terminal No. 4 (Black wire). See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open or high resistance in Black wire between rear wiper motor and ground. Ground point is located in liftgate.
  10. Place wiper arm in PARKED position. Measure resistance between rear wiper motor terminals No. 3 and 4 (component side). See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, replace rear wiper motor. See REAR WIPER MOTOR  under REMOVAL & INSTALLATION.
  11. Place wiper arm in middle of glass. Measure resistance between rear wiper motor terminals No. 3 and 4 (component side). See Figure . If resistance is more than 10 k/ohms, replace GEM. See GENERIC ELECTRONIC MODULE/CENTRAL TIMER MODULE  under REMOVAL & INSTALLATION. If resistance is 10 k/ohms or less, replace rear wiper motor. See REAR WIPER MOTOR  under REMOVAL & INSTALLATION.
  12. Remove linkage from wiper motor. If wipers move freely, check wiper motor. See WIPER MOTOR  under COMPONENT TESTS. If wipers do not move freely, repair binding wiper mechanism.
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