DTC B1028: Rear Wiper Motor (Park) Signal Error
| DTC Description | DTC |
|---|---|
| B1028 Rear wiper motor(Park) signal error |
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .
- 1. Problem verification:
1. Clear the DTCs with the HDS.
2. Turn the vehicle to the OFF (LOCK) mode and then the ON mode.
3. Turn the rear window wiper switch to ON for 15 seconds or more, then turn the switch OFF.
4. Check for DTCs with the HDS.
DTC Description DTC B1028 Rear wiper motor(Park) signal error Is DTC B1028 indicated?
YES
Without keyless access system: go to step 2.
YES
With keyless access system: go to step 4.
NO
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
- 2. Fuse check:
1. Check the following fuse.
Fuse No. B23 (10 A) Location Under-dash fuse/relay box 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. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.
Rear window wiper motor 4P connector 3. Turn the vehicle to the ON mode.
4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Rear window wiper motor 4P connector: disconnected
Test point 1 Rear window wiper motor 4P connector No. 2 Test point 2 Body ground Is there battery voltage?
YES
IG1 WIPER&WASHER wire is OK. Go to step 6.
NO
Repair an open or high resistance in the wire.
- 4. Fuse check:
1. Check the following fuses.
Fuse No. B23 (10 A) No. B36 (10 A) Location Under-dash fuse/relay box Is each fuse OK?
YES
Go to step 5.
NO
Replace the fuse. If the fuse blows again, repair the short to ground in the No. B23 (10 A) and/or No. B36 (10 A) fuse circuit(s).
- 5. Open wire check (RR WIPER MAIN RLY OUT line):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.
Rear window wiper motor 4P connector 3. Turn the vehicle to the ON mode.
4. Measure the voltage between test points 1 and 2.
Test condition Vehicle ON mode Rear window wiper motor 4P connector: disconnected
Test point 1 Rear window wiper motor 4P connector No. 2 Test point 2 Body ground Is there battery voltage?
YES
The RR WIPER MAIN RLY OUT wire is OK. Go to step 6.
NO
Repair an open or high resistance in the wire.
- 6. Open wire check (GND line):
1. Turn the vehicle to the OFF (LOCK) mode.
2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Rear window wiper motor 4P connector: disconnected
Test point 1 Rear window wiper motor 4P connector No. 3 Test point 2 Body ground Is there continuity?
YES
The GND wire is OK. Go to step 7.
NO
Repair an open or high resistance in the ground wire or poor ground (G603).
- 7. Rear window wiper motor check:
1. Do the rear window wiper motor test .
Does the wiper motor run and does it pulse normally?
YES
Go to step 8.
NO
- 8. Shorted wire check (RR WIPER RLY CL- line to power):
1. Disconnect the following connector.
Under-dash fuse/relay box connector T (20P) 2. Measure the voltage between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Rear window wiper motor 4P connector: disconnected
Under-dash fuse/relay box connector T (20P): disconnected
Test point 1 Rear window wiper motor 4P connector No. 4 Test point 2 Body ground Is there battery voltage?
YES
Repair a short to power in the wire to power.
NO
The RR WIPER RLY CL- wire is not shorted to power. Go to step 9.
- 9. Shorted wire check (RR WIPER RLY CL- line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Rear window wiper motor 4P connector: disconnected
Under-dash fuse/relay box connector T (20P): disconnected
Test point 1 Rear window wiper motor 4P connector No. 4 Test point 2 Body ground 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 10.
- 10. Open wire check (RR WIPER RLY CL- line):
1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Rear window wiper motor 4P connector: disconnected
Under-dash fuse/relay box connector T (20P): disconnected
Test point 1 Rear window wiper motor 4P connector No. 4 Test point 2 Under-dash fuse/relay box connector T (20P) No. 20 Is there continuity?
YES
The RR WIPER RLY CL- wire is OK. Faulty MICU; replace the under-dash fuse/relay box .
NO
Repair an open or high resistance in the wire.
