DTC Troubleshooting: B12C6
DTC B12C6: Electric Steering Lock Switch C/D Monitor Circuit Failure
DTC Description
DTC
B12C6 Electric Steering Lock Switch C/D Monitor Circuit Failure
  

1.
Problem verification:

Problem verification
?1.
Clear the DTCs with the HDS.


?2.
Press the engine start/stop button at least 10 times.

?3.
Check for DTCs with the HDS.
DTC Description
DTC
B12C6 Electric Steering Lock Switch C/D Monitor Circuit Failure
  

Is DTC B12C6 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
Keyless access control unit ESL SW line internal short check 1:

Keyless access control unit ESL SW line internal short check 1
?1.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Electrical Steering Lock SWITCH C
OFF
      
Electrical Steering Lock SWITCH D
OFF
      

Are ELECTRICAL STEERING LOCK SWITCH C and ELECTRICAL STEERING LOCK SWITCH D data list values OFF?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
Go to step 8.
3.
Keyless access control unit ESL SW line internal short check 2:

Keyless access control unit ESL SW line internal short check 2
?1.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Electrical Steering Lock SWITCH C
OFF
      
Electrical Steering Lock SWITCH D
OFF
      

Are ELECTRICAL STEERING LOCK SWITCH C data list value OFF?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
Go to step 9.
4.
Keyless access control unit ESL SW line internal short check 3:

Keyless access control unit ESL SW line internal short check 3
?1.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Electrical Steering Lock SWITCH C
OFF
      
Electrical Steering Lock SWITCH D
OFF
      

Are ELECTRICAL STEERING LOCK SWITCH D data list value OFF?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
Go to step 11.
5.
Shorted wire check (ESL SW C line) 1:

Shorted wire check (ESL SW C line) 1
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Check for continuity between test points 1 and 2.
Test condition
OFF mode
Electric steering lock 12P connector: disconnected
Test circuit
ESL SW C
Test point 1
Electric steering lock 12P connector No. 9 (PUR)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Go to step 13.
     
NO
     
     
     
Go to step 6.
6.
Shorted wire check (ESL SW D line) 1:

Shorted wire check (ESL SW D line) 1
?1.
Check for continuity between test points 1 and 2.
Test circuit
ESL SW D
Test point 1
Electric steering lock 12P connector No. 10 (LT GRN)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Go to step 7
     
NO
     
     
     
Faulty electric steering lock, replace the steering lock.?
7.
Shorted wire check (ESL SW D line) 2:

Shorted wire check (ESL SW D line) 2
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Check for continuity between test points 1 and 2.
Test circuit
ESL SW D
Test point 1
Electric steering lock 12P connector No. 10 (LT GRN)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
8.
Open wire check (GND line):

Open wire check (GND line)
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Check for continuity between test points 1 and 2.
Test condition
ON mode
Test circuit
GND
Test point 1
Electric steering lock 12P connector No. 7 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Faulty electric steering lock, replace the steering lock.?
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G501).?
9.
Open wire check (ESL SW C line) 1:

Open wire check (ESL SW C line) 1
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following 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
Test circuit
ESL SW C
Test point 1
Electric steering lock 12P connector No. 9 (PUR)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Faulty electric steering lock, replace the steering lock.?
     
NO
     
     
     
Go to step 10.
10.
Open wire check (ESL SW C line) 2:

Open wire check (ESL SW C line) 2
?1.
Check for continuity between test points 1 and 2.
Test condition
ON mode
Electric steering lock 12P connector: disconnected
Test circuit
ESL SW C
Test point 1
Electric steering lock 12P connector No. 9 (PUR)
Test point 2
Power control unit connector C (24P) No. 15 (PUR)


Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Repair an open or high resistance in the wire.?
11.
Open wire check (ESL SW D line) 1:

Open wire check (ESL SW D line) 1
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following 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
Test circuit
ESL SW D
Test point 1
Electric steering lock 12P connector No. 10 (LT GRN)
Test point 2
Body ground


Is there battery voltage?

     
YES
     
     
     
Faulty electric steering lock, replace the steering lock.?
     
NO
     
     
     
Go to step 12.
12.
Open wire check (ESL SW D line) 2:

Open wire check (ESL SW D line) 2
?1.
Check for continuity between test points 1 and 2 respectively.
Test condition
ON mode
Electric steering lock 12P connector: disconnected
Test circuit
ESL SW D
Test point 1
Electric steering lock 12P connector No. 10 (LT GRN)
Test point 2
Keyless access control unit connector C (24P) No. 17 (LT GRN)


Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Repair an open or high resistance in the wire.?
13.
Short wire check (ESL SW D line) 2:

Short wire check (ESL SW D line) 2
?1.
Press the engine start/stop button to select the OFF mode.

?2.
Disconnect the following connector.

?3.
Check for continuity between test points 1 and 2 respectively.
Test condition
ON mode
Electric steering lock 12P connector: disconnected
Test circuit
ESL SW D
Test point 1
Electric steering lock 12P connector No. 9 (PUR)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO