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Wiper Park Switch Failure

  1. Turn ignition switch to ON position. Using scan tool, monitor WIPER PK SW state. Turn intermittent wipers to any speed setting, monitor WIPER PK SW state for 60 seconds. Scan tool display should switch from CLOSED when wipers are in parked position, and OPEN when wipers are in motion. If scan tool display reads CLOSED at all times, go to next step. If scan tool display does not read CLOSED all the time, go to step  6 .
  2. Turn ignition switch to OFF position. Disconnect windshield wiper motor harness connector. Turn ignition switch to ON position. While monitoring WIPER PK SW state on scan tool, connect a test light between battery voltage and Red/Gray wire of wiper motor harness connector. If WIPER PK SW state reads OPEN, replace wiper motor. If scan tool display does not read OPEN, go to next step.
  3. Turn ignition switch to OFF position. Disconnect Central Timer Module (CTM) connector C1. On high-line models, measure resistance in Dark Green/Yellow wire between wiper motor connector and CTM connector C1 terminal No. 11. On base-line models, measure resistance in Dark Green/Yellow wire between wiper motor connector and CTM connector C1 terminal No. 17. On all models, if reading is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair short to ground in Dark Green/Yellow wire. Perform BODY VERIFICATION TEST  .
  4. Remove wiper relay from Power Distribution Center (PDC). Measure resistance in Dark Green/Yellow wire between appropriate wiper relay connector terminal in PDC and CTM connector C1 terminal No. 11 (No. 17 on base-line models). If resistance is 5 ohms or more, repair short to ground in Dark Green/Yellow wire. If resistance is less than 5 ohms, go to next step.
  5. Inspect wiring harness for damage and intermittent short to ground. Inspect connectors for damage and good terminal contact. Repair connectors as necessary. If wiring and connectors are okay, and fault condition remains, replace CTM. Perform BODY VERIFICATION TEST  .
  6. Turn ignition switch to ON position. Using scan tool, monitor WIPER PK SW state. Turn intermittent wipers to any speed setting, monitor WIPER PK SW state for 60 seconds. Scan tool display should switch from CLOSED when wipers are in parked position, and OPEN when wipers are in motion. If scan tool display reads CLOSED at all times, go to next step. If scan tool display does not read CLOSED all the time, go to step  10 .
  7. Turn ignition switch to OFF position. Turn intermittent wipers off. Remove wiper relay from PDC. Measure voltage in Dark Green/Yellow wire between appropriate wiper relay connector terminal in PDC. If reading is one volt or more, repair short to voltage in Dark Green/Yellow wire. Perform BODY VERIFICATION TEST  . If reading is less than one volt, go to next step
  8. Turn ignition switch to OFF position. Disconnect windshield wiper motor harness connector. Turn ignition switch to ON position. Monitor WIPER PK SW state on scan tool. If WIPER PK SW state reads CLOSED, replace wiper motor. Perform BODY VERIFICATION TEST  . If scan tool display does not read CLOSED, go to next step.
  9. Turn ignition switch to OFF position. Inspect wiring harness for damage and intermittent short to ground. Inspect connectors for damage and good terminal contact. Repair connectors as necessary. If wiring and connectors are okay, and fault condition remains, replace CTM. Perform BODY VERIFICATION TEST  .
  10. Turn ignition switch to OFF position. Remove wiper relay from Power Distribution Center (PDC). Measure resistance in Dark Green/Yellow wire between appropriate wiper relay connector terminal in PDC and CTM connector C1 terminal No. 11 (No. 17 on base-line models). If resistance is 5 ohms or more, repair open in Dark Green/Yellow wire. Perform BODY VERIFICATION TEST  . If resistance is less than 5 ohms, go to next step.
  11. Turn ignition switch to OFF position. Disconnect wiper motor harness connector. Turn ignition switch to ON position. Measure voltage between ground and Dark Blue wire terminal of wiper motor harness connector. If reading is less then 10 volts, repair open in Dark Blue wire between wiper motor harness connector and CTM connector terminal No. 8 (No. 4 on base-line models). Perform BODY VERIFICATION TEST  . If reading is 10 volts or more, go to next step.
  12. Turn ignition switch to OFF position. Measure resistance between wiper motor connector Black wire terminal and ground. If resistance is more than 5 ohms, repair open or high resistance in Black wire. If resistance is less than 5 ohms, replace CTM. Perform BODY VERIFICATION TEST  .
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