B1028

DTC Troubleshooting: B1028

DTC B1028:

Rear Window Wiper Motor (As) Signal Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0), and then back to ON (II).

3. Operate the rear window wiper for 15 seconds or more, then turn the rear window wiper switch OFF.

Does the rear window wiper stop in the normal park position?

YES -

Go to step 4.

NO -

Go to step 14.

4. Check for DTCs with the HDS.

Is DTC B1028 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections.�

5. Do the rear window wiper motor test Wiper Motor Test.

Is the rear window wiper motor OK?

YES -

Go to step 6.

NO -

Replace the rear window wiper motor Service and Repair.�

6. Make sure the ignition switch is in LOCK (0) position, and disconnect under-dash fuse/relay box connector S (20P).

7. Disconnect the rear window wiper motor 4P connector.

8. Connect the rear window wiper motor 4P connector terminal No. 2 and body ground with a jumper wire.






9. Check for continuity between under-dash fuse/relay box connector S (20P) terminal No. 2 and body ground.





Is there continuity?

YES -

Go to step 10.

NO -

Repair an open or high resistance in the wire.�

10. Remove the jumper wire from the rear window wiper motor 4P connector.

11. Check for continuity between under-dash fuse/relay box connector S (20P) terminal No. 2 and body ground.





Is there continuity?

YES -

Repair a short to ground in the wire.�

NO -

Go to step 12.

12. Turn the ignition switch to ON (II).

13. With the rear window wiper motor 4P connector still disconnected, measure the voltage between the rear window wiper motor 4P connector terminal No. 2 and body ground.





Is there voltage?

YES -

Repair a short to power in the wire.�

NO -

Faulty MICU; replace the under-dash fuse/relay box Under-dash Fuse/Relay Box Removal/Installation.�

14. Check the No. 8 (7.5 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 15.

NO -

Replace the blown fuse and recheck.�

15. Do the rear window wiper motor test Wiper Motor Test.

Is the rear window wiper motor OK?

YES -

Go to step 16.

NO -

Replace the rear window wiper motor Service and Repair.�

16. Do the rear window wiper motor relay test Testing and Inspection.

Is the rear window wiper motor relay OK?

YES -

Go to step 17.

NO -

Replace the rear window wiper motor relay.�

17. Disconnect under-hood fuse/relay box connector D (8P).

18. Turn the ignition switch to ON (II).

19. Measure the voltage between under-hood fuse/relay box connector D (8P) terminal No. 7 and body ground, and under-hood fuse/relay box connector F (20P) terminal No. 15 and body ground.









Is there battery voltage?

YES -

Go to step 20.

NO -

Repair an open or high resistance in the wire.�

20. Turn the ignition switch to LOCK (0).

21. Disconnect under-hood fuse/relay box connector E (10P).

22. Disconnect the rear window wiper motor 4P connector.

23. Connect the rear window wiper motor 4P connector terminal No. 1 and body ground with a jumper wire.






24. Check for continuity between under-hood fuse/relay box connector E (10P) terminal No. 2 and body ground.





Is there continuity?

YES -

Go to step 25.

NO -

Repair an open or high resistance in the wire.�

25. Check for continuity between rear window wiper motor 4P connector terminal No. 3 and body ground.





Is there continuity?

YES -

Go to step 26.

NO -

Repair an open or high resistance in the wire or poor ground (G602).�

26. Check for continuity between under-hood fuse/relay box connector F (20P) terminal No. 8 and under-dash fuse/relay box connector S (20P) terminal No. 3.





Is there continuity?

YES -

Faulty MICU; replace the under-dash fuse/relay box Under-dash Fuse/Relay Box Removal/Installation.�

NO -

Repair an open or high resistance in the wire.�