DTC Troubleshooting: B1077

DTC B1077:  Windshield Wiper (As) Signal Error

1.Clear the DTCs with the HDS.

2.Turn the ignition switch OFF, and then back 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 4.


NO - Go to 12.


4.Check for DTCs with the HDS.

Is DTC B1077 indicated?


YES - Go to 5.


NO - Intermittent failure. The windshield wiper system is OK at this time. Check for loose or poor connections.n


5.Turn the ignition switch OFF.

6.Perform the wiper motor test.

Does the wiper motor run normally?


YES - Go to 7.


NO - Replace the windshield wiper motor and recheck.n


7.Disconnect the under-dash fuse/relay box connector F (34P) and windshield wiper motor 5P connector.

8.Check for continuity between the No. 5 (or No. 4)* terminal of the windshield wiper motor 5P connector and No. 32 terminal of the under-dash fuse/relay box connector F (34P).

*: RHD type 

 

Is there continuity?


YES - Go to 9.


NO - Repair an open in the WHT wire.n

9.Check for continuity between the No. 5 (No. 4)* terminal of the windshield wiper motor 5P connector and body ground.

*: RHD type 

 

Is there continuity?


YES - Repair a short in the WHT wire.n


NO - Go to 10.


10.Turn the ignition switch ON (II).

11.Check for voltage between the No. 5 (No. 4)* terminal of the windshield wiper motor 5P connector and body ground.

 

Is there voltage?


YES - Repair a short to power in the WHT wire.n


NO - Faulty MICU; replace the under-dash fuse/relay box.n

12.Turn the ignition switch OFF.

13.Check the No. 38 (30 A) fuse in the under-dash fuse/relay box.

Is the fuse OK?


YES - Go to 14.


NO - Replace the fuse and recheck the system.n


14.Perform the wiper motor test.

Does the wiper motor run normally?


YES - Go to 15.


NO - Replace the windshield wiper motor and recheck.n


15.Disconnect the under-dash fuse/relay box connector F (34P) and windshield wiper motor 5P connector.

16.Check for continuity between the No. 1 (No. 3)* and No. 4 (No. 5)* terminals of the windshield wiper motor 5P connector and No. 18 and No. 19 terminals of the under-dash fuse/relay box connector F (34P) individually.

*: RHD type 

LHD type: 

RHD type: 

Is there continuity?


YES - Go to 17.


NO - Repair an open in the BLU (LO) or YEL (HI) wire.n

17.Check for continuity between the No. 2 terminal of the windshield wiper motor 5P connector and body ground.

 

Is there continuity?


YES - Faulty MICU; replace the under-dash fuse/relay box.n


NO - Repair an open in the BLK wire or poor ground (G201).n