B1028

Control System DTCs

DTC Troubleshooting: B1028

DTC B1028 : Rear Wiper Auto Stop Switch Malfunction

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

1. Problem verification:

-1. Clear the DTCs with the HDS.

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

-3. Turn the rear window wiper switch to INT for 15 seconds or more, then turn the switch OFF.

-4. Check for DTCs with the HDS.





Is DTC B1028 indicated?
-YES- Go to step 2.
-NO- Intermittent failure, the system is OK at this time.

2. Fuse check:

-1. Check the following fuse.





Is the fuse OK?
-YES- Go to step 3.
-NO- Replace the fuse. If the fuse blows again, repair the short to ground in the No. B23 (10 A) fuse circuit.

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

-1. Disconnect the following connector.





-2. Turn the ignition switch to ON (II).

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









Is there battery voltage?
-YES- The IG1 WIPER&WASHER wire is OK. Go to step 4.
-NO- Repair an open or high resistance in the wire.

4. Shorted wire check (RR WIPER RLY CL- line):

-1. Disconnect the following connector.





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









Is there continuity?
-YES- Repair a short to ground in the wire.
-NO- The RR WIPER RLY CL- wire is not shorted. Go to step 5.

5. Open wire check (RR WIPER RLY CL- line):

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









Is there continuity?
-YES- The RR WIPER RLY CL- wire is OK. Go to step 6.
-NO- Repair an open or high resistance in the wire.

6. Rear window wiper motor check:

-1. Do the rear window 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 rear window wiper motor Service and Repair.