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Test C: Front Wipers Do Not Operate Correctly

NOTE: Front wiper/washer switch is a portion of multifunction switch.
NOTE: After making any repair, repeat Generic Electronic Module (GEM) self-test using WDS or NGS tester.
NOTE: Perform all voltage and resistance tests using a Digital Volt-Ohm Meter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter to isolate wiring harness shorts or opens.
  1. Turn ignition switch to LOCK position. Connect Worldwide Diagnostic System (WDS) tester or New Generation Star (NGS) tester to Data Link Connector (DLC), DLC is located below instrument panel. See Figure. Turn ignition switch to RUN position. Using WDS or NGS tester, perform GEM self-test. Retrieve and record continuous Diagnostic Trouble Codes (DTCs). If DTCs B1438 and B1450 are retrieved, go to TEST A: FRONT WIPERS INOPERATIVE . If DTC B1438 or B1450 is retrieved, go to step  3. If DTC B1434, B1436, B1446, B1448 or B1466 is retrieved, go to step  6.
  2. Turn ignition switch to RUN position. Using WDS or NGS tester, monitor GEM PID WPMODE while turning front wiper/washer switch through all positions. If PID values do not agree with front wiper switch positions, go to next step. If PID values agree with front wiper/washer switch positions, go to step  6.
  3. Turn ignition switch to LOCK position. Disconnect both multifunction switch harness connectors C202a and C202b. Multifunction switch harness connectors C202a and C202b are located on steering column. See Figure. Perform front wiper/washer switch component test. See FRONT WIPER/WASHER SWITCH  under COMPONENT TESTS. If front wiper/washer switch is okay, go to next step. If front wiper/washer switch is faulty, replace multifunction switch. See MULTIFUNCTION SWITCH  under REMOVAL & INSTALLATION. After repair, test system for normal operation.
  4. Ensure ignition switch is on LOCK position. Disconnect Generic Electronic Module (GEM) 20-pin harness connector C201b. GEM connector is located behind Central Junction Box (CJB). See Figure. Measure voltage between ground and GEM harness connector C201b terminal No. 4 (Pink/Yellow wire). See Figure. Also measure voltage between ground and GEM harness connector C201b terminal No. 15 (Light Blue/Orange wire). If voltage does not exist, go to next step. If any voltage exists, repair short circuit to power in Pink/Yellow or Light Blue/Orange wire between multifunction switch and GEM. See WIRING DIAGRAMS . After repair, test system for normal operation.
  5. Turn ignition switch to LOCK position. Measure resistance between GEM harness connector C201b terminal No. 4 and multifunction switch harness connector C202b terminal No. 1 (Pink/Yellow wire). See Figure and Figure . If resistance is 5 ohms or less, go to step  23. If resistance is greater than 5 ohms, repair open circuit in Pink/Yellow wire between multifunction switch and GEM. See WIRING DIAGRAMS . After repair, test system for normal operation.
  6. Turn ignition switch to RUN position. Rotate front wiper/washer switch to high speed position. If front wipers do not operate at high speed, go to next step. If front wipers operate at high speed, go to step  16.
  7. Ensure ignition switch is on RUN position. Using WDS or NGS tester, monitor GEM PID WPMODE while turning front wiper/washer switch to high speed position. If GEM PID WPHISP does not indicate SHORTVBAT, go to next step. If GEM PID WPHISP indicates SHORTVBAT, go to step  11.
  8. Using WDS or NGS tester, select GEM active command WIPER_RLY. Trigger WIPER_RLY and SPEED_RLYON. If front wipers do not operate at high speed, go to next step. If front wipers operate at high speed, go to step  23.
  9. Turn ignition switch to LOCK position. Remove wiper high/low relay from Battery Junction Box (BJB). BJB is located in engine compartment. See Figure. Perform wiper high/low relay component test. See RELAYS  under COMPONENT TESTS. If relay is okay, go to next step. If relay is faulty, replace wiper high/low relay. After repair, test system for normal operation.
  10. Turn ignition switch to RUN position. Measure voltage between ground and wiper high/low relay socket connector C1001 terminal No. 1 (White/Black wire). See Figure. If battery voltage exists, go to next step. If battery voltage does not exist, repair open circuit in White/Black wire between CJB and BJB. See WIRING DIAGRAMS . After repair, test system for normal operation.
  11. Measure voltage between ground and wiper high/low relay socket connector C1001 terminal No. 2 (Gray/Light Blue wire). See Figure. If any voltage exists, go to next step. If voltage does not exist, go to step  13.
  12. Turn ignition switch to LOCK position. Disconnect GEM 12-pin harness connector C201a. See Figure. GEM connector is located behind Central Junction Box (CJB). See Figure. Turn ignition switch to RUN position. Measure voltage between ground and wiper high/low relay socket connector C1001 terminal No. 2 (Gray/Light Blue wire). If voltage does not exist, go to step  23. If any voltage exists, repair short circuit to voltage in Gray/Light Blue wire between high/low relay and GEM. See WIRING DIAGRAMS . After repair, test system for normal operation.
  13. Measure resistance between wiper high/low relay socket connector C1001 terminal No. 2 and GEM harness connector C201a terminal No. 12 (Gray/Light Blue wire). See Figure. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open circuit in Gray/Light Blue wire between high/low relay and GEM. See WIRING DIAGRAMS . After repair, test system for normal operation.
  14. Measure resistance between ground and wiper high/low relay socket connector C1001 terminal No. 2 (Gray/Light Blue wire). If resistance is more than 10 k/ohms, go to next step. If resistance 10 k/ohms or less, repair short circuit to ground in Gray/Light Blue wire between high/low relay and GEM. See WIRING DIAGRAMS . After repair, test system for normal operation.
  15. Ensure ignition switch is on LOCK position. Disconnect front wiper motor 5-pin harness connector C125. Front wiper motor harness connector C125 is located on top rear of engine compartment. See Figure. Measure resistance between wiper high/low relay socket connector C1001 terminal No. 5 and front wiper motor harness connector C125 terminal No. 1 (Dark Blue/Orange wire). See Figure and Figure . If resistance is 5 ohms or less, go to step  22. If resistance is greater than 5 ohms, repair open circuit in Dark Blue/Orange wire between wiper high/low relay and front wiper motor. See WIRING DIAGRAMS . After repair, test system for normal operation.
  16. Turn ignition switch to LOCK position. Remove wiper high/low relay from Battery Junction Box (BJB). BJB is located in engine compartment. See Figure. Perform high/low relay component test. See RELAYS  under COMPONENT TESTS. If relay is okay, go to next step. If relay is faulty, replace wiper high/low relay. After repair, test system for normal operation.
  17. Disconnect front wiper motor 5-pin harness connector C125. Front wiper motor harness connector C125 is located on top rear of engine compartment. See Figure.Measure resistance between wiper high/low relay socket connector C1001 terminal No. 4 and front wiper motor harness connector C125 terminal No. 2 (White wire). See Figure and Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open circuit in White wire between wiper high/low relay and front wiper motor. See WIRING DIAGRAMS . After repair, test system for normal operation.
  18. Turn ignition switch to RUN position. Measure voltage between ground and front wiper motor harness connector C125 terminal No. 4 (White/Black wire). If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, repair open circuit in White/Black wire between CJB and front wiper motor. See WIRING DIAGRAMS . After repair, test system for normal operation.
  19. Turn ignition switch to LOCK position. Measure resistance between wiper park/run relay socket connector C1002 terminal No. 4 and front wiper motor harness connector C125 terminal No. 5(Dark Green wire). If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open circuit in Dark Green wire between and CJB. See WIRING DIAGRAMS . After repair, test system for normal operation.
  20. Disconnect Central Junction Box (CJB) 24-pin harness connector C270a. CJB is located behind left side of instrument panel. See Figure. Measure resistance between front wiper motor harness connector C125 terminal No. 5 and CJB harness connector C270a terminal No. 2 (Dark Green wire). See Figure and Figure . If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open in Dark Green wire between front wiper motor and CJB. See WIRING DIAGRAMS . After repair, test system for normal operation.
  21. Disconnect GEM 26-pin connector C201d, located in CJB. See Figure. Measure resistance between CJB harness connector C270a terminal No. 2 (component side) and GEM connector C201d terminal No. 15 (component side). See Fig 1. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, repair open circuit in CJB (component side). See WIRING DIAGRAMS . After repair, test system for normal operation.
  22. Perform front wiper motor component test. See FRONT WIPER MOTOR  under COMPONENT TESTS. If front wiper motor is okay, go to next step. If front wiper motor is faulty, replace front wiper motor. See WIPER MOTOR  under REMOVAL & INSTALLATION. After repair, test system for normal operation.
  23. Disconnect all GEM harness connectors. Check all GEM harness connectors terminals for corroded or pushed-out pins. If connector or terminals are faulty, repair or replace as necessary. If connector and terminals are okay, reconnect all GEM harness connectors. Ensure all other system connectors are properly seated. Operate system and verify if concern is still present. If concern still present, install a new GEM. See GENERIC ELECTRONIC MODULE  under REMOVAL & INSTALLATION. If concern is not present, system is operating properly. Clear DTCs and check system for normal operation.
Fig 1: Identifying CJB Connectors C270a, C270b & C270d Terminals, & GEM Connector C201d Terminals (Component Side)
G00191597Courtesy of FORD MOTOR CO.
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