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Two-Speed Intermittent Windshield Wipers Diagnosis

WINDSHIELD WIPERS DO NOT WORK AT ANY SPEED

Step Action Value(s) Yes No
1 Check fuse F17.
Is fuse F17 blown?		 - Go to Step 2. Go to Step 3.
2
  1. Check for a short circuit and repair it, if necessary.
  2. Replace the fuse.

Is the repair complete?		 - System OK -
3 Check the voltage at fuse F17.
Is the voltage equal to the specified value?		 11 -14V Go to Step 5. Go to Step 4.
4 Repair the open power supply circuit to fuse F17.
Is the repair complete?		 - System OK -
5
  1. Disconnect the wiper motor connector.
  2. Turn the ignition ON.
  3. Turn the wiper switch to HI.
  4. Check the voltage at the wiper motor connector terminal 6.

Is the voltage equal to the specified value?		 11 -14V Go to Step 6. Go to Step 7.
6 Replace the wiper motor.
Is the repair complete?		 - System OK -
7
  1. The wiper switch is still disconnected.
  2. Turn the ignition ON.
  3. Check for battery voltage at the wiper switch connector terminal A8.

Is the voltage equal to the specified value?		 11 -14V Go to Step 9. Go to Step 8.
8 Repair the open circuit between the wiper switch connector terminal A8 and fuse F17.
Is the repair complete?		 - System OK -
9
  1. The wiper switch is still disconnected.
  2. Turn the wiper switch to HI.
  3. Use an ohmmeter to check for continuity between the wiper switch connector terminal A8 and A9.

Does the ohmmeter indicate the specified value?		 0 Go to Step 11. Go to Step 10.
10 Replace the wiper switch.
Is the repair complete?		 - System OK -
11 Repair the open circuit between the wiper switch and the wiper motor.
Is the repair complete?		 - System OK -
WINDSHIELD WIPERS DO NOT WORK ON HI SPEED, LO SPEED OK

Step Action Value(s) Yes No
1
  1. Turn the ignition ON.
  2. Turn the wiper switch to HI.
  3. Check voltage at the wiper motor connector terminal 6.

Is the voltage equal to the specified value?		 11 -14V Go to Step 2. Go to Step 3.
2 Replace the wiper motor.
Is the repair complete?		 - System OK -
3
  1. Disconnect the wiper switch.
  2. Turn the wiper switch to HI.
  3. Use an ohmmeter to check for continuity between the wiper switch connector terminal A8 and A9.

Does the ohmmeter indicate the specified value?		 0 Go to Step 5. Go to Step 4.
4 Replace the wiper switch.
Is the repair complete?		 - System OK -
5 Repair the open circuit between the wiper switch connector terminal A9 and the wiper motor connector terminal 6.
Is the repair complete?		 - System OK -
WINDSHIELD WIPERS DO NOT WORK ON LO SPEED, HI SPEED OK

Step Action Value(s) Yes No
1
  1. Turn the ignition ON.
  2. Turn the wiper switch to LO.
  3. Check the voltage at the wiper motor connector terminal 5.

Is the voltage equal to the specified value?		 11 -14V Go to Step 2. Go to Step 3.
2 Replace the wiper motor.
Is the repair complete?		 - System OK -
3
  1. Disconnect the wiper switch.
  2. Turn the wiper switch to LO.
  3. Use an ohmmeter to check for continuity between the wiper switch connector terminal A8 and A5.

Does the ohmmeter indicate the specified value?		 0 Go to Step 5. Go to Step 4.
4 Replace the wiper switch.
Is the repair complete?		 - System OK -
5 Repair the open circuit between the wiper switch connector terminal A5 and the wiper motor connector terminal 5.
Is the repair complete?		 - System OK -
WINDSHIELD WIPERS DO NOT WORK ON INTERMITTENT, OTHER SPEEDS OK

Step Action Value(s) Yes No
1
  1. Turn the ignition ON.
  2. Use a voltmeter to test voltage at the ISU connector terminal D3.

Is voltage equal to the specified value?		 11 -14 V Go to Step 3. Go to Step 2.
2 Repair the open circuit between the ISU connector terminal D3 and fuse F11.
Is the repair complete?		 - System OK -
3
  1. Turn the ignition ON.
  2. Turn the wiper switch to INT.
  3. Check the voltage at the ISU connector terminal B1.

Does the voltmeter indicate a voltage equal to the specified value?		 11 -14V Go to Step 7. Go to Step 4.
4 Check for an open circuit between wiper switch connector terminal C2 and ISU connector terminal B1.
Is there an open circuit?		 - Go to Step 6. Go to Step 5.
5 Replace the wiper switch.
Is the repair complete?		 - System OK -
6 Repair the open circuit between wiper switch connector terminal C2 and ISU connector terminal B1.
Is the repair complete?		 - System OK -
7
  1. Turn the ignition ON.
  2. Turn the wiper switch to INT.
  3. Check the voltage pulsing at the ISU connector terminal C3.

Does the voltmeter indicate a pulsating voltage equal to the specified value?		 11 -14V Go to Step 8. Go to Step 8.
8
  1. Turn the ignition ON.
  2. Check the voltage at the wiper switch connector terminal A6.

Is the voltage pulsating at the specified value?		 11 -14V Go to Step 9. Go to Step 10.
9 Replace the open circuit between the wiper switch and the ISU.
Is the repair complete?		 - System OK -
10 Replace the ISU. Refer to INTELLIGENT SWITCHING UNIT .
Is the repair complete?		 - System OK -
WINDSHIELD WIPERS DO NOT RETURN TO PARK POSITION

Step Action Value(s) Yes No
1
  1. Turn the ignition ON.
  2. Check the voltage at the wiper motor connector terminal 2.

Is the voltage equal to the specified value?		 11 -14V Go to Step 3. Go to Step 2.
2 Repair the open circuit between the wiper motor and fuse F17.
Is the repair complete?		 - System OK -
3
  1. Turn the wiper switch to HI.
  2. While turning the wiper switch OFF, check the voltage at the wiper motor connector terminal 5.

Is the specified voltage indicated when the wiper switch is turned OFF?		 11 -14V Go to Step 5. Go to Step 4.
4 Replace the wiper motor.
Is the repair complete?		 - System OK -
5
  1. Disconnect the ISU.
  2. Check continuity between the ISU terminal C1 and C3.

Does the ohmmeter indicate the specified value?		 0 Go to Step 6. Go to Step 7.
6 Repair the open circuit between the wiper motor and the ISU.
Is the repair complete?		 - System OK -
7 Replace the ISU.
Is the repair complete?		 - System OK -
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