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Front Wiper Intermittent Inoperative

Possible Causes:

CAUTION: Always turn ignition off before disconnecting or connecting any control module connector. Failure to do so could result in damage to control module.
NOTE: Ensure vehicle being tested has a fully charged battery. If it does not, false symptoms may occur.
NOTE: For component location, see appropriate illustration under COMPONENT LOCATIONS  . For terminal identification, see appropriate illustration under CONNECTOR IDENTIFICATION  . For circuit and wire color identification, see WIRING DIAGRAMS  . For component removal and installation procedures, see appropriate component under REMOVAL & INSTALLATION  .

Testing:

  1. Turn ignition off. Substitute a known-good relay in place of the Front Wiper Relay in the PDC. Turn ignition on. Select the Intermittent Mode on the Front Wiper Switch (Multifunction Switch). Do the Wipers Operate Properly? If yes, replace Front Wiper Relay. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  2. Turn the ignition off. Disconnect the Front Wiper Motor harness connector. Using a 12-volt test light connected to ground, probe the Front Wiper Motor harness connector terminal No. 1. Does test light illuminate brightly? If yes, go to next step. If no, repair open in Fused Ignition Switch Output circuit. If fuse is open, check Fused Ignition Switch Output circuit for a short to ground. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  3. Reconnect Front Wiper Motor harness connector. Turn ignition off. Remove Front Wiper Relay from PDC. Using a 12-volt test light connected to ground, probe Front Wiper Relay harness connector terminals No. 86 and 87. Does test light illuminate brightly on both circuits? If yes, go to next step. If no, repair open in Fused Ignition Switch circuit(s). If fuse is open, check Fused Ignition Switch Output circuit(s) for a short to ground. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  4. Reinstall Front Wiper Relay. Disconnect Front Wiper Switch (Multifunction Switch) harness connector. Select the Intermittent Mode on the Multifunction Switch. Measure resistance between Multifunction Switch terminals No. 2 and 18 (component side). Is resistance 2500-20,000 ohms? If yes, go to next step. If no, replace Multifunction Switch. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  5. Ensure Multifunction Switch is set to Intermittent Mode. Measure resistance between Multifunction Switch terminals No. 4 and 18 (component side). Is resistance more than 5 ohms? If yes, replace Multifunction Switch. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  6. Ensure Multifunction Switch is set to Intermittent Mode. Measure resistance between Multifunction Switch terminals No. 14 and 17 (component side). Is resistance less than 5 ohms? If yes, replace Multifunction Switch. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  7. Disconnect CTM C1 harness connector. Disconnect Front Wiper Motor harness connector. Measure resistance between Multifunction Switch harness connector terminal No. 4 and CTM C1 harness connector terminal No. 8. Is resistance more than 5 ohms? If yes, repair open in Front Wiper Intermittent Mode Sense circuit. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  8. Measure resistance between Multifunction Switch harness connector terminal No. 2 and CTM C1 harness connector terminal No. 13. Is resistance more than 5 ohms? If yes, repair open in Front Wiper Intermittent Switch Signal circuit. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  9. Reconnect CTM C1 harness connector. Disconnect Front Wiper Motor harness connector. Measure resistance between Front Wiper Motor harness connector terminal No. 5 and Multifunction Switch harness connector terminals No. 15 and 17. Is resistance more than 5 ohms on either circuit? If yes, repair open in Front Wiper Motor Low Driver circuit(s). Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  10. Turn ignition off. Reconnect Front Wiper Motor harness connector. Remove the Front Wiper Relay from the PDC. Measure resistance of Front Wiper Relay harness connector terminal No. 85. Is resistance more than 5 ohms? If yes, repair open in the Front Wiper Relay Signal circuit for an open. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  11. Reinstall Front Wiper Relay. Disconnect CTM C1 harness connector. Measure resistance between CTM C1 harness connector terminal No. 13 and Multifunction Switch harness connector terminal No. 2. Is resistance less than 5 ohms? If yes, repair Front Wiper Intermittent Switch Signal circuit for a short to ground. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  12. Using a 12-volt test light connected to ground, probe CTM C1 harness connector terminal No. 13. Does test light illuminate brightly? If yes, repair Front Wiper Intermittent Switch Signal circuit for a short to voltage. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  13. Reconnect Multifunction Switch harness connector. Reconnect CTM C1 harness connector. Disconnect CTM C3 harness connector. Remove Front Wiper Relay. Measure resistance between CTM C3 harness connector terminal No. 7 and Front Wiper Relay harness connector terminal No. 85. Is resistance more than 5 ohms? If yes, repair open in Front Wiper Relay Control circuit. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
  14. If there are no possible causes remaining, replace CTM. Perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
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