B1077

DTC Troubleshooting: B1077

DTC B1077: Wiper (As) Signal Error

1. Clear the DTCs with the HDS.

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

3. Turn the wiper switch to LOW or HIGH for at least 15 seconds, then turn the switch OFF.

Does the wiper motor work?
YES - Go to step 4.

NO - Go to step 13.


4. Check for DTCs with the HDS.

Is DTC B1077 indicated?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.


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

6. Do the wiper motor test. Wiper Motor Test

Does the wiper motor run and does it pulse normally?
YES - Go to step 7.

NO - Replace the wiper motor, and recheck.


7. Disconnect the wiper motor 5P connector.

8. Disconnect under-dash fuse/relay box connector B (36P).

9. Check for continuity between wiper motor 5P connector terminal No. 1 and under-dash fuse/relay box connector B (36P) terminal No. 20.

Is there continuity?
YES - Go to step 10.

NO - Repair open in the PNK wire.






10. Check for continuity between wiper motor 5P connector terminal No. 1 and body ground.

Is there continuity?
YES - Repair short to ground in the PNK wire.

NO - Go to step 11.






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

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

Is there voltage?
YES - Repair short to ground in the PNK wire.

NO - Faulty MICU; replace the under-dash fuse/relay box. Under-Dash Fuse/Relay Box Removal And Installation (USA Models)






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

14. Check the No. 56 (30 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?
YES - Go to step 15.

NO - Replace the fuse, and recheck the system.


15. Do the wiper motor test. Wiper Motor Test

Does the wiper motor run normally?
YES - Go to step 16.

NO - Replace the wiper motor and recheck.


16. Disconnect under-dash fuse/relay box connector A (36P) and the wiper motor 5P connector.

17. Check for continuity between under-dash fuse/relay box connector A (36P) terminals and the wiper motor 5P connector terminals as shown:





Is there continuity?
YES - Go to step 18.

NO - Repair open in the BLU (LOW) or GRN (HIGH) wire.






18. Check for continuity between wiper motor 5P connector terminal No. 4 and body ground.

Is there continuity?
YES - Faulty MICU; replace the under-dash fuse/relay box. Under-Dash Fuse/Relay Box Removal And Installation (USA Models)

NO - Repair an open in the BLK wire or poor ground (G301).