DTC Troubleshooting: B12C7
DTC B12C7: Electric Steering Lock Motor Circuit Failure
DTC Description
DTC
B12C7 Electric Steering Lock Motor Circuit Failure
  

1.
Problem verification:

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


?2.
Do this procedure 10 times: Press the engine start/stop button to select the OFF, ACC, ON, and OFF mode.

?3.
Check for DTCs with the HDS.
DTC Description
DTC
B12C7 Electric Steering Lock Motor Circuit Failure
  

Is DTC B12C7 indicated?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
2.
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
OFF mode
Electric steering lock 12P connector: disconnected
Test circuit
GND
Test point 1
Electric steering lock 12P connector No. 7 (BLK)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
The GND wire is OK. Go to step 3.
     
NO
     
     
     
Repair an open or high resistance in the ground wire or poor ground (G501).?
3.
Shorted wire check (MTR CUT1 (CONT), MTR CUT2 (IG1) lines):

Shorted wire check (MTR CUT1 (CONT), MTR CUT2 (IG1) lines)
?1.
Disconnect the following connector.

?2.
Check for continuity between test points 1 and 2 individually.
Test condition
OFF mode
Electric steering lock 12P connector: disconnected
Keyless access control unit connector C (24P): disconnected
Test circuit
MTR CUT1 (CONT)
Test point 1
Electric steering lock 12P connector No. 2 (BLU)
Test point 2
Body ground

Test circuit
MTR CUT2 (IG1)
Test point 1
Electric steering lock 12P connector No. 4 (GRN)
Test point 2
Body ground


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the wire.?
     
NO
     
     
     
The MTR CUT1 (CONT) and MTR CUT2 (IG1) wires are not shorted. Go to step 4.
4.
Open wire check (MTR CUT1 (CONT), MTR CUT2 (IG1) lines):

Open wire check (MTR CUT1 (CONT), MTR CUT2 (IG1) lines)
?1.
Check for continuity between test points 1 and 2 respectively.
Test condition
OFF mode
Electric steering lock 12P connector: disconnected
Keyless access control unit connector C (24P): disconnected
Test circuit
MTR CUT2 (IG1)
Test point 1
Keyless access control unit connector C (24P) No. 16 (GRN)
Test point 2
Electric steering lock 12P connector No. 4 (GRN)

Test circuit
MTR CUT1 (CONT)
Test point 1
Keyless access control unit connector C (24P) No. 14 (BLU)
Test point 2
Electric steering lock 12P connector No. 2 (BLU)


Is there continuity?

     
YES
     
     
     
Faulty electric steering lock, replace the steering lock. If the DTC is still present, replace the keyless access control unit.?
     
NO
     
     
     
Repair an open or high resistance in the wire.?