( TL19E00K769000Y1077FAAT00 )

DTC Troubleshooting: B1077

DTC B1077:
Wiper Auto-stop (As) Signal Circuit Malfunction

1. Clear the DTCs with the HDS.

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

1. Turn the wiper switch to LOW or HIGH for at least 15 seconds, then turn the wiper switch OFF.
   NOTE: If the wiper motor does not run, go to Step 13 .

Do the wiper arms stop at AUTO STOP (park) position?

YES | - | Go to Step 4 .
NO | - | Go to Step 5 .

1. Check for DTCs with the HDS.

Is DTC B1077 indicated?

YES | - | Check for loose or poor connections at the driver's MICU and the wiper motor. If the connections are OK, substitute a known-good driver's under-dash fuse/relay box, and recheck. If the DTC does not reappear, replace the driver's under-dash fuse/relay box.■
NO | - | Intermittent failure, the system is OK at this time. Check for loose or poor connections.■

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

1. Do the wiper motor test.

Is the wiper motor OK?

YES | - | Go to Step 7 .
NO | - | Replace the wiper motor and recheck.■

1. Disconnect the wiper motor 4P connector.

1. Disconnect driver's under-dash fuse/relay box connector F (33P).

1. Check for continuity between the wiper motor 4P connector No. 3 [No. 4] terminal and driver's under-dash fuse/relay box connector F (33P) No. 9 terminal.
   [ ]: RHD model

Is there continuity?

YES | - | Go to Step 10 .
NO | - | Repair an open in the WHT wire.■

LHD model
RHD model

1. Check for continuity between the driver's under-dash fuse/relay box and body ground.

Is there continuity?

YES | - | Repair a short to ground in the WHT wire.■
NO | - | Go to Step 11 .

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

1. Measure the voltage between the wiper motor 4P connector No. 3 [No. 4] terminal and body ground.
   [ ]:RHD model

Is there voltage?

YES | - | Repair a short to power in the WHT wire.■
NO | - | Faulty driver's MICU; replace the driver's under-dash fuse/relay box.■

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

1. Check the No. 3-8 (WIP MTR) (30 A) fuse in the under-hood fuse/relay box.

Is the fuse OK?

YES | - | Go to Step 15 .
NO | - | Replace the fuse and recheck the system.■

1. Do the wiper motor test.

Is the wiper motor OK?

YES | - | Go to Step 16 .
NO | - | Replace the wiper motor and recheck.■

1. Reconnect the wiper motor 4P connector.

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

1. Measure the voltage between body ground and the wiper motor 4P connector No. 2 [No. 1] terminal with the wiper switch ON (Low), and measure the voltage between body ground and the wiper motor 4P connector No. 4 [No. 3] terminal with the wiper switch ON (High) respectively.
   [ ]: RHD model

Is there battery voltage?

YES | - | Go to Step 19 .
NO | - | Test the wiper relay circuit. If the relay circuit is OK, check the F7 and F8 terminals of the driver's under-dash fuse/relay box connector F (33P) by the input test. If the input tests prove OK, replace the driver's under-dash fuse/relay box . If the relay circuit is faulty, replace the relay circuit board.■

1. Check for continuity between body ground and the wiper motor 4P connector No. 1 [No. 2] terminal.
   [ ]: RHD model

Is there continuity?

YES | - | Replace the wiper motor.■
NO | - | Repair an open in the BLK wire or poor ground (G302) [G201].■ [ ]: RHD model