DTC Troubleshooting: B1028
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.

1.
Problem verification:

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 5.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
Fuse check:

Fuse check
?1.
Check the following fuse.
Fuse
No. C40 (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. C40 (10 A) fuse circuit.?
3.
Open wire check (IG1 RR WIPER line):

Open wire check (IG1 RR WIPER line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Rear window wiper motor 3P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
ON mode
Rear window wiper motor 3P connector: disconnected
Test point 1
Rear window wiper motor 3P connector No. 1
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The IG1 RR WIPER wire is OK. Go to step 4.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
4.
Rear window wiper motor check:

Rear window wiper motor check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Do the rear window wiper motor test.

Does the wiper motor run and does it pulse normally?

     
YES
     
     
     
Go to step 12.
     
NO
     
     
     
5.
Fuse check:

Fuse check
?1.
Check the following fuses.
Fuse
No. C23 (10 A)
No. C40 (10 A)
Location
Under-dash fuse/relay box

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. C23 (10 A) and/or No. C40 (10 A) fuse circuit(s).?
6.
Rear wiper motor relay check:

Rear wiper motor relay check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Remove the rear wiper motor relay from the under-dash relay holder B, and test it.

Is the relay OK?

     
YES
     
     
     
Go to step 7.
     
NO
     
     
     
Replace the rear wiper motor relay, then recheck.?
7.
Open wire check (+B RR WIPER line):

Open wire check (+B RR WIPER line)
?1.
Measure the voltage between test points 1 and 2.
Test condition
OFF mode
Rear wiper motor relay: disconnected
Test point 1
Rear wiper motor relay (4P) No. 3
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The +B RR WIPER wire is OK. Go to step 8.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
8.
Open wire check (IG1 RR WIPER line):

Open wire check (IG1 RR WIPER line)
?1.
Turn the vehicle to the ON mode.

?2.
Measure the voltage between test points 1 and 2.
Test condition
ON mode
Rear wiper motor relay: disconnected
Test point 1
Rear wiper motor relay (4P) No. 7
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The IG1 RR WIPER wire is OK. Go to step 9.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
9.
Open wire check (GND line):

Open wire check (GND line)
?1.
Check for continuity between test points 1 and 2.
Test condition
ON mode
Rear wiper motor relay: disconnected
Test point 1
Rear wiper motor relay (4P) No. 8
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The GND wire is OK. Go to step 10.
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G403).?
10.
Open wire check (RR WIPER MAIN RLY OUT line):

Open wire check (RR WIPER MAIN RLY OUT line)
?1.
Check for continuity between test points 1 and 2 individually.
Test condition
Vehicle ON mode
Rear wiper motor relay (4P): disconnected
Rear window wiper motor 3P connector: disconnected
Test point 1
Rear wiper motor relay (4P) No. 4
Test point 2
Rear window wiper motor 3P connector No. 1


Is there continuity?

     
YES
     
     
     
The RR WIPER MAIN RLY OUT wire is OK. Go to step 11.
     
NO
     
     
     
Repair an open or high resistance in the wire.?
11.
Rear window wiper motor check:

Rear window wiper motor check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Do the rear window wiper motor test.

Does the wiper motor run and does it pulse normally?

     
YES
     
     
     
Go to step 12.
     
NO
     
     
     
12.
Shorted wire check (RR WIPER MTR line to power):

Shorted wire check (RR WIPER MTR line to power)
?1.
Disconnect the following connector.
Under-dash fuse/relay box connector N (52P)

?2.
Measure the voltage between test points 1 and 2.
Test condition
OFF mode
Rear wiper motor relay (4P): disconnected*
Rear window wiper motor 3P connector: disconnected
Under-dash fuse/relay box connector N (52P): disconnected
Test point 1
Rear window wiper motor 3P connector No. 3
Test point 2
Body ground
*: With keyless access system


Is there battery voltage?

     
YES
     
     
     
Repair a short to power in the wire to power.?
     
NO
     
     
     
The RR WIPER MTR wire is not shorted to power. Go to step 13
13.
Shorted wire check (RR WIPER MTR line):

Shorted wire check (RR WIPER MTR line)
?1.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
Rear wiper motor relay (4P): disconnected*
Rear window wiper motor 3P connector: disconnected
Under-dash fuse/relay box connector N (52P): disconnected
Test point 1
Rear window wiper motor 3P connector No. 3
Test point 2
Body ground
*: With keyless access system


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
The RR WIPER MTR wire is not shorted. Go to step 14.
14.
Open wire check (RR WIPER MTR line):

Open wire check (RR WIPER MTR line)
?1.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
Rear wiper motor relay (4P): disconnected*
Rear window wiper motor 3P connector: disconnected
Under-dash fuse/relay box connector N (52P): disconnected
Test point 1
Rear window wiper motor 3P connector No. 3
Test point 2
Under-dash fuse/relay box connector N (52P) No. 40
*: With keyless access system


Is there continuity?

     
YES
     
     
     
The RR WIPER MTR wire is OK. Faulty MICU; replace the under-dash fuse/relay box.?
     
NO
     
     
     
Repair an open or high resistance in the wire.?