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Test L: Rear Wiper Does Not Function Properly

WARNING: This page is about a different car, the 1997 Mercury Mountaineer and 1997 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect New Generation Star (NGS) tester (007-00500) to Data Link Connector (DLC). DLC is located under left side of instrument panel. Retrieve continuous DTC(s) stored in GEM. Clear continuous DTC(s). Following NGS tester manufacturer's instructions, perform on-demand self-test and note all DTC(s). If DTC(s) exist, service DTC(s) in numerical order. See TEST L DTC INDEX TABLE. If no DTC(s) exist, go to next step.
    TEST L DTC INDEX

    DTC Go To Step
    B1342 (1)
    B1611 2
    B1614 2
    B1619 18
    B1622 13
    B1822 6
    B1825 6
    B1826 13
    B1829 18
    (1) Replace GEM, clear DTC(s) and retest system.
  2. Monitor PID R_WP_MD while turning rear wiper switch through all its positions. If PID R_WP_MD agrees with switch positions, go to step 6). If PID R_WP_MD do not agree with switch positions, go to next step.
  3. Turn ignition off. Disconnect rear wiper switch harness connector. Measure resistance between rear wiper switch terminals No. 2 and 5 while moving rear wiper switch through all positions. See Figure . See REAR WIPER SWITCH RESISTANCE TEST TABLE. If resistance is a s specified, go to next step. If resistance is not as specified, replace rear wiper switch, clear DTC(s) and retest system.
    REAR WIPER SWITCH RESISTANCE TEST

    Switch Position Resistance (Ohms)
    Off 9100
    First Interval Delay 2420
    Second Interval Delay 431
    High 110
  4. Disconnect GEM 16-pin harness connector. Measure resistance of Pink/Black wire between rear wiper switch harness connector terminal No. 2 and ground. See Figure . If resistance is greater than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in Pink/Black wire, clear DTC(s) and retest system.
  5. Measure resistance of Gray/Red wire between rear wiper switch harness connector terminal No. 5 and ground. See Figure . If resistance is greater than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in Gray/Red wire, clear DTC(s) and retest system.
  6. Monitor PID R_WP_PK. Turn wiper switch on and off. On vehicles manufactured through 6/28/96, if PID R_WP_PK indicates PARKED when switch is on and indicates notPARKED when switch is off, go to step 13). On vehicles manufactured after to 6/28/96, if PID response is as described, go to step 12). If PID response is not as described, go to next step.
  7. Turn ignition off. Disconnect rear wiper motor harness connector and GEM 16-pin harness connector. Measure resistance of Pink/Yellow wire between GEM 16-pin connector terminal No. 4 and rear wiper motor harness connector terminal No. 5 (terminal No. 3 if manufactured after 6/28/96). See Figure , Fig 1 and Fig 2 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Pink/Yellow wire, clear DTC(s) and retest system.
    Fig 1: Identifying Rear Wiper Motor Terminals Manufactured Through 6/28/96
    G97A28142Courtesy of FORD MOTOR CO.
    Fig 2: Identifying Rear Wiper Motor Terminals Manufactured After 6/28/96
    G97B28143Courtesy of FORD MOTOR CO.
  8. Measure resistance of Pink/Yellow wire between GEM 16-pin connector terminal No. 4 and ground. If resistance is greater than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in Pink/Yellow wire, clear DTC(s) and retest system.
  9. Measure resistance of Black wire between rear wiper motor harness connector terminal No. 6 (terminal No. 4, if manufactured after 6/28/96). See Fig 1 and Fig 2 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair Pink/Yellow wire between GEM and wiper motor. Clear DTC(s) and retest system.
  10. Place wiper arm in parked position. Measure resistance between rear wiper motor harness connector terminals No. 5 and 6 (terminals No. 2 and 3, if manufactured after 6/28/96). See Fig 1 and Fig 2 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace rear wiper motor, clear DTC(s) and retest system.
  11. Place wiper arm in any non-parked position. Measure resistance between rear wiper motor harness connector terminals No. 5 and 6 (terminals No. 2 and 3, if manufactured after 6/28/96). See Fig 1 and Fig 2 . If resistance is greater than 10 k/ohms, replace GEM. If resist ance is less than 10 k/ohms, replace rear wiper motor. After repair, clear DTC(s) and retest system.
  12. Turn ignition off. Remove wiper linkage from wiper motor. Check wiper linkage for free operation. If linkage is free binding and operational resistance, check wiper motor. See WIPER MOTOR  under COMPONENT TESTS. If linkage does not operate freely, repair as necessary. Reconnect linkage, clear DTC(s) and retest system.
    NOTE: Test steps 13)-22) apply only to vehicles manufactured 4/1/96-6/28/96.
  13. Monitor PID R_WP_MD. Set active command UP RELAY to ON. If PID R_WP_MD indicates WPHIGH, go to step 18. If PID R_WP_MD does not indicate WPHIGH, go to next step.
  14. Turn ignition off. Disconnect rear wiper motor harness connector and GEM 16-pin harness connector. Measure resistance of Dark Green/Purple wire between rear wiper motor harness connector terminal No. 1 and GEM 16-pin harness connector terminal No. 6. See Figure , Fig 1 and Fig 2 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Dark Green/Purple wire, clear DTC(s) and retest.
  15. Turn ignition on. Measure voltage at GEM 16-pin harness connector terminal No. 6. See Figure . If no voltage is indicated, go to next step. If voltage is indicated, repair short to power in Dark Green/Purple wire. Clear DTC(s) and retest system.
  16. Measure resistance between GEM 16-pin harness connector terminal No. 6 (Light Blue wire) and ground. See Figure . If resistance is greater than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in Light Blue wire. Clear DTC(s) and retest system.
  17. Disconnect rear wiper motor harness connector. Measure resistance between wiper motor Black wire and Pink/Yellow wire terminals. If resistance is less than 5 ohms, replace GEM. If resistance is greater than 5 ohms, replace rear wiper motor. After repair, clear DTC(s) and retest system.
  18. Monitor PID R_WP_MD. Set active command DWN RELAY to ON. If PID R_WP_MD indicates WPLOW, check wiper motor. See WIPER MOTOR  under COMPONENT TESTS. If PID R_WP_MD does not indicate WPLOW, go to next step.
  19. Turn ignition off. Disconnect GEM 16-pin connector and rear wiper motor connector. Measure resistance of Dark Green/Purple wire between GEM 16-pin connector terminal No. 6 and ground. See Figure . If resistance is greater than 10 k/ohms, go to next step. If resistance is less than 10 k/ohms, repair short to ground in Dark Green/Purple wire, clear DTC(s) and retest system.
  20. Measure resistance of Light Blue wire between GEM 16-pin connector terminal No. 7 and rear wiper motor connector terminal No. 2. See Figure , Fig 1 and Fig 2 . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Light Blue wire, clear DTC(s) and retest system.
  21. Measure voltage at GEM 16-pin connector terminal No. 7 (Light Blue wire). See Figure . If no voltage is indicated, go to next step. If voltage is indicated, repair short to power in Light Blue wire, clear DTC(s) and retest system.
  22. Measure resistance between rear wiper motor terminals No. 2 and 6. If resistance is 5 ohms or less, replace GEM. If resistance is greater than 5 ohms, replace rear wiper motor. After repair, clear DTC(s) and retest system.
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