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
  

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

1.
Problem verification:

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

?2.
Clear the DTCs with the HDS.


?3.
Press the engine start/stop switch at least 10 times.

?4.
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 13.
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.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Electric steering lock 12P connector

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

Is there continuity?

     
YES
     
     
     
Go to step 6.
     
NO
     
     
     
Go to step 7.
6.
Short wire check (ESL SW C line) 2:

Short wire check (ESL SW C line) 2
?1.
Disconnect the following connector.
Keyless access control unit connector B (36P)

?2.
Check for continuity between test points 1 and 2 respectively.
Test condition
Vehicle OFF (LOCK) mode
Electric steering lock 12P connector: disconnected
Keyless access control unit connector B (36P): disconnected
Test point 1
Electric steering lock 12P connector No. 9
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
7.
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 condition
Vehicle OFF (LOCK) mode
Electric steering lock 12P connector: disconnected
Test point 1
Electric steering lock 12P connector No. 10
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Go to step 8
     
NO
     
     
     
Faulty electric steering lock, replace the steering lock.?
8.
Shorted wire check (ESL SW D line) 2:

Shorted wire check (ESL SW D line) 2
?1.
Disconnect the following connector.
Keyless access control unit connector B (36P)

?2.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Electric steering lock 12P connector: disconnected
Keyless access control unit connector B (36P): disconnected
Test point 1
Electric steering lock 12P connector No. 10
Test point 2
Body ground

Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
9.
Open wire check (ESL SW C line) 1:

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

?2.
Disconnect the following connector.
Electric steering lock 12P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Electric steering lock 12P connector: disconnected
Test point 1
Electric steering lock 12P connector No. 9
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.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Keyless access control unit connector B (36P)

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Electric steering lock 12P connector: disconnected
Keyless access control unit connector B (36P): disconnected
Test point 1
Electric steering lock 12P connector No. 9
Test point 2
Keyless access control unit connector B (36P) No. 4

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

?2.
Disconnect the following connector.
Electric steering lock 12P connector

?3.
Turn the vehicle to the ON mode.

?4.
Measure the voltage between test points 1 and 2.
Test condition
Vehicle ON mode
Electric steering lock 12P connector: disconnected
Test point 1
Electric steering lock 12P connector No. 10
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.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Disconnect the following connector.
Keyless access control unit connector B (36P)

?3.
Check for continuity between test points 1 and 2 respectively.
Test condition
Vehicle OFF (LOCK) mode
Electric steering lock 12P connector: disconnected
Keyless access control unit connector B (36P): disconnected
Test point 1
Electric steering lock 12P connector No. 10
Test point 2
Keyless access control unit connector B (36P) No. 2

Is there continuity?

     
YES
     
     
     
     
NO
     
     
     
Repair an open or high resistance in the wire.?
13.
Open wire check (GND line):

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

?2.
Disconnect the following connector.
Electric steering lock 12P connector

?3.
Check for continuity between test points 1 and 2.
Test condition
Vehicle OFF (LOCK) mode
Electric steering lock 12P connector: disconnected
Test point 1
Electric steering lock 12P connector No. 7
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 (G401).?