DTC B12C7: Electric Steering Lock Motor Circuit Failure

NOTE:  If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC ChecksBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS)Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not CommunicatingBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFFBody Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON .

• 1. Problem verification:

  1. Clear the DTCs with the HDS.

  2. Do this procedure 10 times: Turn the vehicle to the OFF (LOCK) mode, ACCESSORY mode, ON mode, and OFF (LOCK) mode.

  3. Check for DTCs with the HDS.

  DTC Description	DTC
  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):

  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
  Test point 1	Electric steering lock 12P connector No. 7
  Test point 2	Body ground

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

  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 (G502).

• 3. Shorted wire check (MTR CUT1 (CONT), MTR CUT2 (IG1) lines):

  1. Disconnect the following connector.

  Keyless access control unit connector C (24P)

  2. Check for continuity between test points 1 and 2 individually.

  Test condition	Vehicle OFF (LOCK) mode Electric steering lock 12P connector: disconnected Power control unit connector C (24P): disconnected
  Test point 1	Electric steering lock 12P connector No. 2
  Test point 2	Body ground

  Test point 1	Electric steering lock 12P connector No. 4
  Test point 2	Body ground

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

  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):

  1. 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 C (24P): disconnected

  Test point 1	Keyless access control unit connector C (24P) No. 16
  Test point 2	Electric steering lock 12P connector No. 4

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

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

  Is there continuity?

  YES 

  OK The MTR CUT1 (CONT), MTR CUT2 (IG1) lines OK. 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.