DTC Troubleshooting: C0041-14
DTC C0041-14: Brake Switch Signal Circuit Error
NOTE:
If DTC U0029-00 is stored at the same time as DTC C0041-14 troubleshoot DTC U0029-00 first, then recheck for DTC C0041-14.
Before you troubleshoot, review the general troubleshooting information.

DTC Description
DTC
Freeze Frame
C0041-14 Brake Switch Signal Circuit Error
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Turn the vehicle to the OFF (LOCK) mode, then the ON mode.

?4.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
C0041-14 Brake Switch Signal Circuit Error
    

Is DTC C0041-14 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting. 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.?
2.
Brake pedal position switch check 1:

Brake pedal position switch check 1
?1.
Turn the vehicle to the ON mode.

?2.
Check the brake switch signal (BRAKE SW (N.O.), BRAKE SW (N.C.)) with the HDS.
Signal
Current conditions
Values
Unit
BRAKE switch (Normally open)
    

Does BKSW (N.O.) indicate OFF?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
If BKSW (N.C.) indicate OFF, go to step 10.
     
NO
     
     
     
If BKSW (N.C.) indicate ON, do the brake pedal adjustment.?
3.
Brake pedal position switch check 2:

Brake pedal position switch check 2
?1.
Check the brake switch signal (BRAKE SW (N.C.)) with the HDS.
Signal
Current conditions
Values
Unit
BRAKE switch (Normally close)
    

Does BKSW (N.C.) indicate OFF?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 6.
4.
Brake pedal position switch check 3:

Brake pedal position switch check 3
?1.
Check the brake switch signal (BRAKE SW (N.O.)) with the HDS under this condition.
FRONT BRAKE PRESSURE with pressing the brake pedal in 2 MPa.

Signal
Current conditions
Values
Unit
BRAKE PRESSURE
    
BRAKE switch (Normally open)
    

Does BKSW (N.O.) indicate ON?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
If BKSW (N.C.) indicate OFF, do the brake pedal adjustment.
     
NO
     
     
     
If BKSW (N.C.) indicate ON, go to step 12.
5.
Brake pedal position switch check 4:

Brake pedal position switch check 4
?1.
Check the brake switch signal (BRAKE SW (N.C.)) with the HDS under this condition.
FRONT BRAKE PRESSURE with pressing the brake pedal in 2 MPa.

Signal
Current conditions
Values
Unit
BRAKE PRESSURE
    
BRAKE switch (Normally close)
    

Does BKSW (N.C.) indicate ON?

     
YES
     
     
     
The system is OK at this time.?
     
NO
     
     
     
Go to step 17.
6.
Fuse check 1:

Fuse check 1
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check the following fuse.
Fuse
No. B13 (15 A)
Location
Under-dash fuse/relay box

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 7.
     
NO
     
     
     
Replace the fuse. Turn the vehicle to the ON mode, then the OFF (LOCK). If the fuse blows again, repair the short to ground on the No. B13 (15 A) fuse circuit.?
7.
Brake pedal position switch check 5:

Brake pedal position switch check 5
?1.
Check the brake pedal position switch.

Is the brake pedal position switch OK?

     
YES
     
     
     
Go to step 8.
     
NO
     
     
     
8.
Open wire check (IG1 ACG line):

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

?2.
Disconnect the following connector.
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
 
Brake pedal position switch 4P connector: disconnected
Test point 1
Brake pedal position switch 4P connector No. 4
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
The IG1 ACG wire is OK. Go to step 9.
     
NO
     
     
     
Repair an open in the wire between the No. B13 (15 A) fuse in the under-dash fuse /relay box and the brake pedal position switch.?
9.
Open wire check (BKSWNC line):

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

?2.
Jump the SCS line with the HDS.


?3.
Reconnect the following connector.
Brake pedal position switch 4P connector

?4.
Disconnect the following connector.
PCM connector A (51P)

?5.
Turn the vehicle to the ON mode.

?6.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
PCM connector A (51P): disconnected
 
Brake pedal is not depressed
Test point 1
PCM connector A (51P) No. 24
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The BKSWNC wire is OK. Go to step 19.
     
NO
     
     
     
Repair an open in the wire between the PCM and the brake pedal position switch.?
10.
Brake pedal position switch check 2:

Brake pedal position switch check 2
?1.
Check the brake pedal position switch.

Is the brake pedal position switch OK?

     
YES
     
     
     
Go to step 11.
     
NO
     
     
     
11.
Shorted wire check (STOP SW line to power):

Shorted wire check (STOP SW line to power)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Reconnect the following connector.
Brake pedal position switch 4P connector

?4.
Disconnect the following connector.
PCM connector A (51P)

?5.
Turn the vehicle to the ON mode.

?6.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
PCM connector A (51P): disconnected
 
Brake pedal is not depressed
Test point 1
PCM connector A (51P) No. 37 (K24W1 engine)
 
PCM connector A (51P) No. 25 (J35Y1 engine)
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
Repair a short to power in the wire between the brake pedal position switch and the brake lights relay or the PCM.?
     
NO
     
     
     
The STOP SW wire is OK. Go to step 19.
12.
Brake lights check:

Brake lights check
?1.
Check the brake lights when pressing the brake pedal.

Are the brake lights OK?

     
YES
     
     
     
Go to step 13.
     
NO
     
     
     
Go to step 14.
13.
Open wire check (STOP SW line):

Open wire check (STOP SW line)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Disconnect the following connector.
PCM connector A (51P)

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
PCM connector A (51P): disconnected
 
Brake pedal is depressed
Test point 1
PCM connector A (51P) No. 37 (K24W1 engine)
 
PCM connector A (51P) No. 25 (J35Y1 engine)
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
The STOP SW wire is OK. Go to step 19.
     
NO
     
     
     
Repair an open in the wire between the PCM and the brake pedal position switch.?
14.
Fuse check:

Fuse check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check the following fuse.
Fuse
No. A6 (10 A)
Location
Under-hood fuse/relay box

Is the fuse OK?

     
YES
     
     
     
The fuse is OK. Reinstall the fuse, then go to step 15.
     
NO
     
     
     
Replace the fuse. If the fuse blows again, repair the short to ground on the No. A6 (10 A) fuse circuit.?
15.
Brake pedal position switch check 4:

Brake pedal position switch check 4
?1.
Check the brake pedal position switch.

Is the brake pedal position switch OK?

     
YES
     
     
     
Go to step 16.
     
NO
     
     
     
16.
Open wire check (+B STOP line):

Open wire check (+B STOP line)
?1.
Disconnect the following connector.
Brake pedal position switch 4P connector

?2.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
 
Brake pedal position switch 4P connector: disconnected
Test point 1
Brake pedal position switch 4P connector No. 2
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Repair an open in the wire between the brake pedal position switch and the brake lights relay or the VSA modulator-control unit.?
     
NO
     
     
     
Repair an open in the wire between the No. A6 (10 A) fuse in the under-hood fuse/relay box and the brake pedal position switch.?
17.
Brake pedal position switch check 5:

Brake pedal position switch check 5
?1.
Check the brake pedal position switch.

Is the brake pedal position switch OK?

     
YES
     
     
     
Go to step 18.
     
NO
     
     
     
18.
Shorted wire check (BKSWNC line to power):

Shorted wire check (BKSWNC line to power)
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Jump the SCS line with the HDS.


?3.
Reconnect the following connector.
Brake pedal position switch 4P connector

?4.
Disconnect the following connector.
PCM connector A (51P)

?5.
Turn the vehicle to the ON mode.

?6.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
 
PCM connector A (51P): disconnected
 
Brake pedal is depressed
Test point 1
PCM connector A (51P) No. 24
Test point 2
Body ground

Is there battery voltage?

     
YES
     
     
     
Repair a short to power in the wire between the brake pedal position switch and the PCM.?
     
NO
     
     
     
The BKSWNC wire is OK. Go to step 19.
19.
PCM check (substitution):

PCM check (substitution)
?1.
Reconnect the following connector.
PCM connector A (51P)

?2.
Substitute a known-good PCM.

?3.
Turn the vehicle to the OFF (LOCK) mode.

?4.
Turn the vehicle to the ON mode, and wait 20 seconds.

?5.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
C0041-14 Brake Switch Signal Circuit Error
    

Is DTC C0041-14 indicated?

     
YES
     
     
     
Check for loose terminals and poor connections in the PCM connector A (51P). If they are OK, replace the PCM.?
     
NO
     
     
     
Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTC's troubleshooting.?