DTC Troubleshooting: B2637 - 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.

Check for DTCs with the HDS.

DTC Description	DTC
B2637 Sensor Power failure

Is DTC B2637 indicated?


	YES

Go to step 2.


	NO

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

2.

Determine possible failure area (BOF line to power, others):

Determine possible failure area (BOF line to power, others)

?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.	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 Parking and back-up sensor control unit 24P 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	Body ground

Is there battery voltage?


	YES

Go to step 6.


	NO

The BOF SIDE L wire is not shorted to power. Go to step 3.

3.

Determine possible failure area (BOF line to ground, others):

Determine possible failure area (BOF line to ground, others)

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

?2.

Connect terminals A and B with a jumper wire.

Terminal A	Parking and back-up sensor control unit 24P connector No. 11 (BLU)
Terminal B	Body ground

?3.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Parking and back-up sensor control unit 24P connector No. 11: jumped to body ground
Test circuit	BOF SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 2 (TAN)
Test point 2	Body ground

Is there continuity?


	YES

Go to step 7.


	NO

The BOF SIDE L wire is OK. Go to step 4.

4.

Determine possible failure area (BOR line to power, others):

Determine possible failure area (BOR line to power, others)

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

?2.

Measure the voltage between test points 1 and 2.

Test condition	ON mode Parking and back-up sensor control unit 24P connector: disconnected
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there battery voltage?


	YES

Go to step 10.


	NO

The BOR SIDE L wire is not shorted to power. Go to step 5.

5.

Determine possible failure area (BOR line to ground, parking and back-up sensor control unit):

Determine possible failure area (BOR line to ground, parking and back-up sensor control unit)

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

?2.

Connect terminals A and B with a jumper wire.

Terminal A	Parking and back-up sensor control unit 24P connector No. 23 (TAN)
Terminal B	Body ground

?3.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Parking and back-up sensor control unit 24P connector No. 23: jumped to body ground
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there continuity?


	YES

Go to step 13.


	NO

Replace the parking and back-up sensor control unit.?

6.

Shorted wire check (BOF CTR L line to power):

Shorted wire check (BOF CTR L line to power)

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

?2.

Disconnect the following connector.

Left 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 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	Body ground

Is there battery voltage?


	YES

Repair a short to power in the BOF SIDE L wire between the left front corner sensor and the parking and back-up sensor control unit.?


	NO

Repair a short to power in the BOF CTR L wire between the left front corner sensor and the right front corner sensor.?

7.

Determine possible failure area (right front corner sensor, others):

Determine possible failure area (right front corner sensor, others)

?1.	Substitute a known-good right front corner sensor.

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Parking and back-up sensor control unit 24P connector No. 11: jumped to body ground
Test circuit	BOF SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 2 (TAN)
Test point 2	Body ground

Is there continuity?


	YES

Go to step 8.


	NO

Replace the right front corner sensor.?

8.

Determine possible failure area (BOF SIDE L line, others):

Determine possible failure area (BOF SIDE L line, others)

?1.

Disconnect the following connector.

Left front corner sensor 6P connector

?2.

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 Parking and back-up sensor control unit 24P connector No. 11: jumped to body ground
Test circuit	BOF SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 2 (TAN)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the BOF SIDE L wire between the left front corner sensor and the parking and back-up sensor control unit.?


	NO

Go to step 9.

9.

Shorted wire check (BOF CTR L line):

Shorted wire check (BOF CTR L line)

?1.	Substitute a known-good left front corner sensor.

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Parking and back-up sensor control unit 24P connector No. 11: jumped to body ground
Test circuit	BOF SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 2 (TAN)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the BOF CTR L wire between the left front corner sensor and the right front corner sensor.?


	NO

Replace the left front corner sensor.?

10.

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

Shorted wire check (BOR SIDE R line to power)

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

?2.

Disconnect the following connector.

Right rear center 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 Parking and back-up sensor control unit 24P connector: disconnected Right rear center sensor 6P connector: disconnected
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there battery voltage?


	YES

Go to step 11,


	NO

Repair a short to power in the BOR SIDE R wire between the right rear corner sensor and the right rear center sensor.?

11.

Shorted wire check (BOR CTR R line to power):

Shorted wire check (BOR CTR R line to power)

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

?2.

Disconnect the following connector.

Left rear center 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 Parking and back-up sensor control unit 24P connector: disconnected Right rear center sensor 6P connector: disconnected Left rear center sensor 6P connector: disconnected
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 1	Body ground

Is there battery voltage?


	YES

Go to step 12.


	NO

Repair a short to power in the BOR CTR R wire between the right rear center sensor and the left rear center sensor.?

12.

Shorted wire check (BOR CTR L line to power):

Shorted wire check (BOR CTR L line to power)

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

?2.

Disconnect the following connector.

Left rear 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 Parking and back-up sensor control unit 24P connector: disconnected Right rear center sensor 6P connector: disconnected Left rear center sensor 6P connector: disconnected Left rear corner sensor 6P connector: disconnected
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there battery voltage?


	YES

Repair a short to power in the BOR SIDE L wire between the left rear corner sensor and the parking and back-up sensor control unit.?


	NO

Repair a short to power in the BOR CTR L wire between the left rear center sensor and the left rear corner sensor.?

13.

Determine possible failure area (right rear corner sensor, others):

Determine possible failure area (right rear corner sensor, others)

?1.	Substitute a known-good right rear corner sensor.

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Parking and back-up sensor control unit 24P connector No. 23: jumped to body ground
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there continuity?


	YES

Go to step 14.


	NO

Replace the right rear corner sensor.?

14.

Determine possible failure area (BOR SIDE R line, others):

Determine possible failure area (BOR SIDE R line, others)

?1.

Disconnect the following connector.

Right rear center sensor 6P connector

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Right rear center sensor 6P connector: disconnected Parking and back-up sensor control unit 24P connector No. 23: jumped to body ground
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there continuity?


	YES

Go to step 15.


	NO

Go to step 18.

15.

Determine possible failure area (BOR CTR R line, others):

Determine possible failure area (BOR CTR R line, others)

?1.

Disconnect the following connector.

Left rear center sensor 6P connector

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Right rear center sensor 6P connector: disconnected Left rear center sensor 6P connector: disconnected Parking and back-up sensor control unit 24P connector No. 23: jumped to body ground
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there continuity?


	YES

Go to step 16.


	NO

Go to step 19.

16.

Determine possible failure area (BOR SIDE L line, others):

Determine possible failure area (BOR SIDE L line, others)

?1.

Disconnect the following connector.

Left rear corner sensor 6P connector

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Right rear center sensor 6P connector: disconnected Left rear center sensor 6P connector: disconnected Left rear corner sensor 6P connector: disconnected Parking and back-up sensor control unit 24P connector No. 23: jumped to body ground
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the BOR SIDE L wire between the left rear corner sensor and the parking and back-up sensor control unit.?


	NO

Go to step 17.

17.

Shorted wire check (BOR CTR L line):

Shorted wire check (BOR CTR L line)

?1.	Substitute a known-good left rear corner sensor.

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Right rear center sensor 6P connector: disconnected Left rear center sensor 6P connector: disconnected Parking and back-up sensor control unit 24P connector No. 23: jumped to body ground
Test circuit	BOR SIDE L
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the BOR CTR L wire between the left rear corner sensor and the left rear center sensor.?


	NO

Replace the left rear corner sensor.?

18.

Shorted wire check (BOR SIDE R line):

Shorted wire check (BOR SIDE R line)

?1.	Substitute a known-good right rear center sensor.

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Parking and back-up sensor control unit 24P connector No. 23: jumped to body ground
Test circuit	BOR SIDE R
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the BOR SIDE R wire between the right rear center sensor and the right rear corner sensor.?


	NO

Replace the right rear center sensor.?

19.

Shorted wire check (BOR CTR R line):

Shorted wire check (BOR CTR R line)

?1.	Substitute a known-good left rear center sensor.

?2.

Check for continuity between test points 1 and 2.

Test condition	OFF mode Parking and back-up sensor control unit 24P connector: disconnected Right rear center sensor 6P connector: disconnected: disconnected Parking and back-up sensor control unit 24P connector No. 23: jumped to body ground
Test circuit	BOR CTR R
Test point 1	Parking and back-up sensor control unit 24P connector No. 14 (BLU)
Test point 2	Body ground

Is there continuity?


	YES

Repair a short to ground in the BOR CTR R wire between the right rear center sensor and the left rear center sensor.?


	NO

Replace the left rear center sensor.?