DTC Troubleshooting: B2641 - Honda Accord CR/CT 2012-2017

1.

Problem verification:

Problem verification

?1.	Clear the DTCs with the HDS.

?2.	Press the engine start/stop button to select the OFF mode and then the ON mode.

?3.	Turn the parking and back-up sensor switch to ON.

?4.	Wait for at least 5 seconds.

?5.

Check for DTCs with the HDS.

DTC Description	DTC
B2641 Front right sensor bus failure

Is DTC B2641 indicated?


	YES

Go to step 2.


	NO

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

2.

DTC check:

DTC check

?1.

Check for DTCs with the HDS.

DTC Description	DTC
B2638 Front left sensor bus failure
B2641 Front right sensor bus failure

Is DTC B2638 and/or B2641 indicated?


	YES

Go to step 3.


	YES

Go to step 8.


	NO

Check for loose or poor connections. If OK, replace the parking and back-up sensor control unit.?

3.

Right front corner sensor check:

Right front corner sensor check

?1.	Swap the right front corner sensor and the left front corner sensor.

?2.	Clear the DTCs with the HDS.

?3.	Press the engine start/stop button to select the OFF mode and then the ON mode.

?4.	Turn the parking and back-up sensor switch to ON.

?5.	Wait for at least 5 seconds.

?6.

Check for DTCs with the HDS.

DTC Description	DTC
B2641 Front right sensor bus failure

Is DTC B2641 indicated?


	YES

Go to step 4.


	NO

Replace the original right front corner sensor.?

4.

Determine possible failure area (SOF SIDE R line, power and ground lines):

Determine possible failure area (SOF SIDE R line, power and ground lines)

?1.	Press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

Right front corner sensor 6P connector

?3.	Press the engine start/stop button to select the ON mode.

?4.

Measure the voltage between test points 1 and 2.

Test condition	ON mode Right front corner sensor 6P connector: disconnected
Test circuit	BOF CTR L , E1 CTR L
Test point 1	Right front corner sensor 6P connector No. 6 (RED)
Test point 2	Right front corner sensor 6P connector No. 4 (PUR)

Is there about 8 V?


	YES

Go to step 5.


	NO

Go to step 7.

5.

Shorted wire check (SOF SIDE R line to power):

Shorted wire check (SOF SIDE R line to power)

?1.

Measure the voltage between test points 1 and 2.

Test condition	ON mode Right front corner sensor 6P connector: disconnected
Test circuit	SOF SIDE R
Test point 1	Right front corner sensor 6P connector No. 2 (GRY)
Test point 2	Body ground

Is there battery voltage?


	YES

Repair a short to power in SOF SIDE R wire between the right front corner sensor and the parking and back-up sensor control unit.?


	NO

The SOF SIDE R wire is not shorted to power, go to step 6.

6.

Shorted wire check (SOF SIDE R line):

Shorted wire check (SOF SIDE R line)

?1.	Press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

Parking and back-up sensor control unit 24P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Right front corner sensor 6P connector: disconnected Parking and back-up sensor control unit 24P connector: disconnected
Test circuit	SOF SIDE R
Test point 1	Right front corner sensor 6P connector No. 2 (GRY)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in SOF SIDE R wire between the right front corner sensor and the parking and back-up sensor control unit.?


	NO

Repair an open or high resistance in SOF SIDE R wire between the right front corner sensor and the parking and back-up sensor control unit.?

7.

Open wire check (BOF CTR L, E1 CTR L lines):

Open wire check (BOF CTR L, E1 CTR L lines)

?1.	Press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connector.

Left front corner sensor 6P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Right front corner sensor 6P connector: disconnected Left front corner sensor 6P connector: disconnected
Test circuit	BOF CTR L
Test point 1	Right front corner sensor 6P connector No. 6 (RED)
Test point 2	Left front corner sensor 6P connector No. 5 (RED)

Is there continuity?


	YES

Repair an open or high resistance in E1 CTR L wire between the right front corner sensor and the left front corner sensor.?


	NO

Repair an open or high resistance in BOF CTR L wire between the right front corner sensor and the left front corner sensor.?

8.

Open wire check (BOF SIDE L, E1 SIDE L lines):

Open wire check (BOF SIDE L, E1 SIDE L lines)

?1.	Press the engine start/stop button to select the OFF mode.

?2.

Disconnect the following connectors.

Parking and back-up sensor control unit 24P connector
Left front corner sensor 6P connector

?3.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Left front corner sensor 6P connector: disconnected
Test circuit	BOF SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 2 (TAN)
Test point 2	Left front corner sensor 6P connector No. 6 (ORN)

Is there continuity?


	YES

Repair an open or high resistance in E1 SIDE L wire between the parking and back-up sensor control unit and the left front corner sensor.?


	NO

Repair an open or high resistance in BOF SIDE L wire between the parking and back-up sensor control unit and the left front corner sensor.?