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 - 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. Press the engine start/stop switch 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 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 8.

  NO 

  Go to step 3.

• 3. Keyless access control unit ESL SW line 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 9.

  NO 

  Go to step 4.

• 4. Keyless access control unit ESL SW line 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 11.

  NO 

  Go to step 5.

• 5. 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

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

  Is there continuity?

  YES 

  Go to step 13.

  NO 

  Go to step 6.

• 6. 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

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

  Is there continuity?

  YES 

  Go to step 7

  NO 

  The ESL SW D wire is OK. Replace the steering lock .

• 7. Shorted wire check (ESL SW D line) 2:

  1. Disconnect the following connector.

  Keyless access control unit connector C (24P)

  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 C (24P): disconnected
  Test point 1	Electric steering lock 12P connector No. 10
  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 ESL SW D wire is OK. Replace the keyless access control unit .

• 8. 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

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

  Is there continuity?

  YES 

  The SGND wire is OK. Replace the steering lock .

  NO 

  Repair an open or high resistance in the ground wire or poor ground (G502).

• 9. 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

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

  Is there battery voltage?

  YES 

  The ESL SW C wire is OK. Replace the steering lock .

  NO 

  Go to step 10.

• 10. 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 C (24P)

  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 C (24P): disconnected
  Test point 1	Electric steering lock 12P connector No. 9
  Test point 2	Keyless access control unit connector C (24P) No. 15

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

  Is there continuity?

  YES 

  The ESL SW C wire is OK. Replace the keyless access control unit .

  NO 

  Repair an open or high resistance in the wire.

• 11. 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

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

  Is there battery voltage?

  YES 

  The ESL SW D wire is OK. Replace the steering lock .

  NO 

  Go to step 12.

• 12. 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 C (24P)

  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 C (24P): disconnected
  Test point 1	Electric steering lock 12P connector No. 10
  Test point 2	Keyless access control unit connector C (24P) No. 17

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

  Is there continuity?

  YES 

  The ESL SW D wire is OK. Replace the keyless access control unit .

  NO 

  Repair an open or high resistance in the wire.

• 13. Short wire check (ESL SW C line) 2:

  1. Disconnect the following connector.

  Keyless access control unit connector C (24P)

  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 C (24P): disconnected
  Test point 1	Electric steering lock 12P connector No. 9
  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 ESL SW C wire is OK. Replace the keyless access control unit .