DTC Troubleshooting: B1028 (5-door) - Honda Civic FC/FK 2016-2021

DTC Troubleshooting: B1028

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.

DTC Description	DTC
B1028 Rear Wiper Motor(Park) Signal Error

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 INT 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

Go to step 2.


	NO

Intermittent failure, the system is OK at this time. Check for loose or poor connections.?

Fuse check:

Fuse check

?1.

Check the following fuse.

Fuse	No. B3 (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. B3 (10 A) fuse circuit.?

Open wire check (IG1 OPTION4 line):

Open wire check (IG1 OPTION4 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 OPTION4 wire is OK. Go to step 4.


	NO

Repair an open or high resistance in the wire.?

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 5.


	NO

Replace the rear window wiper motor.?

Shorted wire check (RR WIPER MTR line to power):

Shorted wire check (RR WIPER MTR line to power)

?1.

Disconnect the following connector.

Body control module connector A (14P)

?2.

Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode Rear window wiper motor 3P connector: disconnected Body control module connector A (14P): disconnected
Test point 1	Rear window wiper motor 3P connector No. 3
Test point 2	Body ground

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 6

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	Vehicle OFF (LOCK) mode Rear window wiper motor 3P connector: disconnected Body control module connector A (14P): disconnected
Test point 1	Rear window wiper motor 3P connector No. 3
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the wire.?


	NO

The RR WIPER MTR wire is not shorted. Go to step 7.

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	Vehicle OFF (LOCK) mode Rear window wiper motor 3P connector: disconnected Body control module connector A (14P): disconnected
Test point 1	Body control module connector A (14P) No. 7
Test point 2	Rear window wiper motor 3P connector No. 3

Is there continuity?


	YES

The RR WIPER MTR wire is OK. Go to step 8.


	NO

Repair an open or high resistance in the wire.?

Open wire check (GND line):

Open wire check (GND line)

?1.

Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode Rear window wiper motor 3P connector: disconnected Body control module connector A (14P): disconnected
Test point 1	Body control module connector A (14P) No. 6
Test point 2	Body ground

Is there continuity?


	YES

The GND wire is OK. Replace the body control module.?


	NO

Repair an open or high resistance in the ground wire or poor ground (G501).?