B1077

Control System DTCs

DTC Troubleshooting: B1077

DTC B1077 : Wiper Switch (As) Malfunction

NOTE: Refer to the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connectors.

1. Determine possible failure area (windshield wiper motor and its drive circuit, FR WIPER AS line):

-1. Clear the DTCs with the HDS.

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

-3. Turn the windshield wiper switch to LOW or HIGH for 15 seconds or more, then turn the switch OFF.

Does the wiper motor work?
-YES- FR WIPER AS line: go to step 2.
-NO- Windshield wiper motor and its drive circuit: go to step 5.

2. Problem verification (DTC):

-1. Check for DTCs with the HDS.





Is DTC B1077 indicated?
-YES- Go to step 3.
-NO- Intermittent failure, the system is OK at this time.

3. Windshield wiper motor check (AS signal):

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

-2. Do the windshield wiper motor test Wiper Motor Test.

Does the wiper motor run and does it pulse normally?
-YES- Go to step 4.
-NO- Replace the windshield wiper motor Service and Repair.

4. Open or shorted wire check (FR WIPER AS line):

-1. Disconnect the following connectors.





-2. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The FR WIPER AS wire is OK. Repair a short to ground in the wire.
-NO- Repair an open or high resistance in the wire.

5. Fuse check:

-1. Check the following fuses.










Is each fuse OK?
-YES- Go to step 6.
-NO- Replace the fuse. If the fuse blows again, repair the short to ground in the No. A2-9 (30 A) and/or No. B23 (10 A) fuse circuit(s).

6. Open wire check (+B FR WIPER MAIN line):

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

-2. Disconnect the following connectors.





-3. Measure the voltage between test points 1 and 2.









Is there battery voltage?
-YES- The +B FR WIPER MAIN wire is OK. Go to step 7.
-NO- Repair an open or high resistance in the wire.

7. Open wire check (IG1 WIPER&WASHER line):

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

-2. Measure the voltage between test points 1 and 2.









Is there battery voltage?
-YES- The IG1 WIPER&WASHER wire is OK. Go to step 8.
-NO- Repair an open or high resistance in the wire.

8. Relay circuit board check:

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

-2. Do the relay circuit board test Testing and Inspection.

Is the relay circuit board OK?
-YES- Go to step 9.
-NO- Replace the relay circuit board Testing and Inspection.

9. Open wire check (GND line):

-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- GND wire is OK. Go to step 10.
-NO- Repair an open or high resistance in the ground wire or poor ground (G302).

10. Open wire check (FR WIPER INT RLY CL- line):

-1. Disconnect the following connector.





-2. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The FR WIPER INT RLY CL- wire is OK. Go to step 11.
-NO- Repair an open or high resistance in the wire.

11. Open wire check (FR WIPER HI line):

-1. Disconnect the following connector.





-2. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- FR WIPER HI wire is OK. Go to step 12.
-NO- Repair an open or high resistance in the wire.

12. Open wire check (WIPER HI/LO RLY CL- line):

-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The WIPER HI/LO RLY CL- wire is OK. Go to step 13.
-NO- Repair an open or high resistance in the wire.

13. Open wire check (FR WIPER LO line):

-1. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- The FR WIPER LO wire is OK. Go to step 14.
-NO- Repair an open or high resistance in the wire.

14. Windshield wiper motor check:

-1. Do the windshield wiper motor test Wiper Motor Test.

Does the wiper motor run and does it pulse normally?
-YES- Faulty MICU; replace the under-dash fuse/relay box Under-Dash Fuse/Relay Box Removal and Installation.
-NO- Replace the windshield wiper motor Service and Repair.