DTC B1077: Wiper (As) Signal Error

WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If you are troubleshooting multiple DTC's, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0) and then back to ON (II).
Turn the wiper switch to LOW or HIGH for at least 15 seconds, then turn the switch OFF.
Do the wiper arms stop at AUTO STOP (park) position?

YES - Go to step 4.

NO - Go to step 5.
Check for DTCs with the HDS.
Is DTC B1077 indicated?

YES - Check for loose or poor connections at the MICU and the wiper motor. If the connections are OK, replace the under-dash fuse/ relay box (see appropriate REMOVAL AND INSTALLATION procedure ).

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections.
Turn the ignition switch to LOCK (0).
Do the windshield wiper motor test (see WIPER MOTOR TEST ).
Is the windshield wiper motor OK?

YES - Go to step 7.

NO - Replace the windshield wiper motor (see WIPER MOTOR REPLACEMENT , and recheck.
Disconnect the wiper motor 5P connector.
Disconnect under-dash fuse/relay box connector B (36P).
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 an open or high resistance in the wire.

Fig 1: Checking Continuity Between Wiper Motor 5P Connector Terminal 1 & Under-Dash Fuse/Relay Box Connector B (36P) Terminal 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.

Fig 2: Checking Continuity Between Wiper Motor 5P Connector Terminal 1 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II).
Measure the voltage between windshield 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 (see appropriate REMOVAL AND INSTALLATION procedure ).

Fig 3: Measuring Voltage Between Wiper Motor 5P Connector Terminal 1 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to LOCK (0).
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.
Do WIPER MOTOR TEST .
Is the windshield wiper motor OK?

YES - Go to step 16.

NO - Replace the windshield wiper motor (see WIPER MOTOR REPLACEMENT ), and recheck.
Disconnect under-dash fuse/relay box connector A (36P) and the wiper motor 5P connector.
Measure the voltage between body ground and windshield wiper motor 5P connector terminal No. 3 with the wiper switch ON (Low), and measure the voltage between body ground and windshield wiper motor 5P connector terminal No. 5 with the wiper switch ON (High) individually.

Fig 4: Measuring Voltage Between Body Ground And Windshield Wiper Motor 5P Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there voltage?

YES - Repair an open or high resistance in the wire between the windshield wiper motor and body ground. If the wire is OK, check for poor ground (G301).

NO - Go to step 18.
Measure the voltage between body ground and under-dash fuse/relay box connector A (36P) terminal No. 14 with the wiper switch ON (Low), and measure the voltage between body ground and under-dash fuse/relay box connector A (36P) terminal No. 7 with the wiper switch ON (High) individually.

Fig 5: Measuring Voltage Between Body Ground And Under-Dash Fuse/Relay Box Connector A (36P) Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there voltage?

YES - Repair an open or high resistance in the BLU (LO) or GRN (HI) wire.

NO - Check for loose or poor connections at the MICU and the windshield wiper motor. If the connections are OK, replace the under-dash fuse/relay box (see appropriate REMOVAL AND INSTALLATION procedure ).