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. Turn the ignition switch to ON (II), and check the rear window wiper operation.

Does the rear window wiper operate normally?

YES -

Go to step 11.

NO -

Go to step 2.

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

3. Check the No. 20 (10 A) fuse in the driver's under-dash fuse/relay box.

Is the fuse OK?

YES -

Go to step 4.

NO -

Replace the fuse and recheck. If the fuse is blown again, check for a short to ground in the wire between the driver's under-dash fuse/relay box and MICU-rear junction box, and between the driver's under-dash fuse/relay box and under-hood fuse/relay box.�

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

5. Measure the voltage between rear window wiper motor 4P connector terminal No. 1 and body ground.





Is there battery voltage?

YES -

Go to step 9.

NO -

Go to step 6.

6. Measure the voltage between MICU-rear junction box connector F (13P) terminal No. 7 and body ground.





Is there battery voltage?

YES -

Go to step 7.

NO -

Repair an open in the wire.�

7. Measure the voltage between MICU-rear junction box connector A (14P) terminal No. 2 and body ground.





Is there battery voltage?

YES -

Go to step 8.

NO -

Repair an open in the wire.�

8. Measure the voltage between rear window wiper motor 4P connector terminal No. 2 and body ground.





Is there less than 0.2 V?

YES -

Replace the rear window wiper motor.�

NO -

Repair an open in the wire or poor ground (G701) or an open in the ground wire.�

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

10. Disconnect the 4P connector from the rear window wiper motor.

11. Disconnect MICU-rear junction box connector F (13P).

12. Check for continuity between MICU-rear junction box connector F (13P) terminal No. 6 and rear window wiper motor 4P connector terminal No. 3.





Is there continuity?

YES -

Go to step 13.

NO -

Repair an open in the wire.�

13. Reconnect the 4P connector to the rear window wiper motor.

14. Connect the voltmeter to rear window wiper motor 4P connector terminal No. 3.

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

16. Check the rear window wiper motor As signal output with the rear window wiper switch ON.





Is there pulse voltage between 0-about 5 V?

YES -

Replace the MICU-rear junction box.�

NO -

Replace the rear window wiper motor.�