DTC P0703: Brake Pedal Position Switch (NC) Malfunction

NOTE:

Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems How to Troubleshoot the CVT System(CVT System) .
If the accelerator pedal is pressed with pressing the brake pedal lightly and continuously for 5 minutes or more, this DTC will be stored.

DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
P0703 Brake Pedal Position Switch (NC) Malfunction

1. Brake pedal position switch signal (BKSWNC) check 1:

1. Turn the vehicle to the ON mode.

2. Check the parameter(s) below with the HDS without pressing the brake pedal.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
CRUISE BRAKE SW/IDLE STOP SW	CLOSE

Do the current condition(s) match the threshold?

YES

Go to step 7.

Go to step 2.

2. Brake pedal position switch installation check:

1. Turn the vehicle to the OFF (LOCK) mode.

2. Remove the brake pedal position switch .

3. Reconnect the following connector.

Brake pedal position switch 4P connector

4. Turn the vehicle to the ON mode.

5. Check the parameter(s) below with the HDS without pressing the brake pedal position switch.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
CRUISE BRAKE SW/IDLE STOP SW	OPEN

Do the current condition(s) match the threshold?

YES

Adjust the brake pedal and the brake pedal position switch .

Go to step 3.

3. Determine possible failure area (brake pedal position switch, others):

1. Turn the vehicle to the OFF (LOCK) mode.

2. Disconnect the following connector.

Brake pedal position switch 4P connector

3. Connect terminals A and B with a jumper wire.

Terminal A

Brake pedal position switch 4P connector No. 3

Terminal B

Brake pedal position switch 4P connector No. 4

Courtesy of HONDA, U.S.A., INC.

4. Turn the vehicle to the ON mode.

5. Check the parameter(s) below with the HDS.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
CRUISE BRAKE SW/IDLE STOP SW	CLOSE

Do the current condition(s) match the threshold?

YES

Replace the brake pedal position switch .

Go to step 4.

4. Determine possible failure area (IG1 ACG line, others):

1. Turn the vehicle to the OFF (LOCK) mode.

2. Remove the jumper wire from the brake pedal position switch 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
Test condition	Brake pedal position switch 4P connector: disconnected
Test point 1	Brake pedal position switch 4P connector No. 4
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there battery voltage?

YES

The IG1 ACG wire is OK. Go to step 5.

Go to step 6.

5. Open wire check (BKSWNC line):

1. Turn the vehicle to the OFF (LOCK) mode.

2. Jump the SCS line with the HDS, and wait more than 1 minute.

3. Disconnect the following connector.

PCM connector A (51P)

4. Connect terminals A and B with a jumper wire.

Terminal A	Brake pedal position switch 4P connector No. 3
Terminal B	Brake pedal position switch 4P connector No. 4

Courtesy of HONDA, U.S.A., INC.

5. Turn the vehicle to the ON mode.

6. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
	Brake pedal position switch 4P connector: disconnected
	Brake pedal position switch 4P connector No. 3 and No. 4: jumped
	PCM connector A (51P): disconnected
Test point 1	PCM connector A (51P) No. 24
Test point 2	Body ground

Is there battery voltage?

YES

The BKSWNC wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0703 goes away and the PCM was updated, troubleshooting is complete. If DTC P0703 goes away and the PCM was substituted, replace the original PCM .

Repair an open in the BKSWNC wire between the PCM (A24) and the brake pedal position switch.

6. Fuse check:

1. Turn the vehicle to the OFF (LOCK) mode.

2. Check the following fuse.

Fuse	No. B2 (10 A)
Location	Under-dash fuse/relay box

Is the fuse OK?

YES

Repair an open in the IG1 ACG wire between the No. B2 (10 A) fuse and the brake pedal position switch.

Replace the No. B2 (10 A) fuse. Also check for a short to ground on the No. B2 (10 A) fuse circuit if needed.

7. Brake pedal position switch signal (BKSWNC) check 2:

1. Turn the vehicle to the ON mode.

2. Press the brake pedal.

3. Check the parameter(s) below with the HDS while pressing the brake pedal.

Signal	Threshold		Current conditions
Signal	Values	Unit	Values	Unit
CRUISE BRAKE SW/IDLE STOP SW	OPEN

Do the current condition(s) match the threshold?

YES

Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the brake pedal position switch and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

Go to step 8.

8. Brake pedal position switch check:
1. Test the brake pedal position switch .

Is the brake pedal position switch OK?

YES

The brake pedal position switch is OK. Repair a short to power in the BKSWNC wire between the PCM (A24) and the brake pedal position switch.

NO

Replace the brake pedal position switch .