DTC : B12E1

DTC B12E1  : Electric Steering Lock Motor Internal Error

DTC (Power Control Unit)

NOTE: 

• If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Go to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
• Before troubleshooting, make sure the No. C3 (7.5 A) and No. C9 (7.5 A) fuses in the under-dash fuse/relay box are OK.

1. Problem verification

   - 1. Clear the DTCs with the HDS.

   Clear DTCs

   - 2. Do this procedure ten times: Press the engine start/stop switch to select the OFF (LOCK), ACCESSORY, ON, and OFF (LOCK) mode.

   - 3. Check for DTCs with the HDS.

   DTC Description	DTC
   B12E1 Electric Steering Lock Motor Internal Error

   Is DTC B12E1 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 (+B SMART line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Electric steering lock 12P connector

   - 3. Measure the voltage 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. 3
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The +B SMART wire is OK. Go to step 3.

   NO 

   Repair an open or high resistance in the wire.

3. Open wire check (PGND line)

   -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. 7
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   The PGND wire is OK. Go to step 4.

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G401).

4. Open wire check (IG1 VSA line)

   -1. Turn the vehicle to the ON mode.

   - 2. 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. 12
   Test point 2	Body ground

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

   Is there battery voltage?

   YES 

   The IG1 VSA wire is OK. Go to step 5.

   NO 

   Repair an open or high resistance in the wire.

5. Open wire check (MTR CONT line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Keyless access/TPMS 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/TPMS control unit connector B (36P): disconnected
   Test point 1	Electric steering lock 12P connector No. 1
   Test point 2	Keyless access/TPMS control unit connector B (36P) No. 31 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2019 2020 2021) .

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

   Is there continuity?

   YES 

   The MTR CONT wire is OK. Go to step 6.

   NO 

   Repair an open or high resistance in the wire.

6. Shorted wire check (MTR CUT1, MTR CUT2 lines)

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

   Test condition	Vehicle OFF (LOCK) mode Electric steering lock 12P connector: disconnected Keyless access/TPMS control unit connector B (36P): 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 and MTR CUT2 wires are not shorted. Go to step 7.

7. Open wire check (MTR CUT1, MTR CUT2 lines)

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

   Test condition	Vehicle OFF (LOCK) mode Electric steering lock 12P connector: disconnected Keyless access/TPMS control unit connector B (36P): disconnected
   Test point 1	Keyless access/TPMS control unit connector B (36P) No. 5 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2019 2020 2021) .
   Test point 2	Electric steering lock 12P connector No. 2

   Test point 1	Keyless access/TPMS control unit connector B (36P) No. 6 - Refer to: Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2016 2017 2018) or Keyless Access/TPMS Control Unit Connector for Inputs and Outputs (2019 2020 2021) .
   Test point 2	Electric steering lock 12P connector No. 4

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

   Is there continuity?

   YES 

   The MTR CUT1 and MTR CUT2 wires are OK. Replace the Steering Lock - Removal and Installation .

   If the DTC is still present, replace the Keyless Access/TPMS Control Unit - Removal and Installation .

   NO 

   Repair an open or high resistance in the wire.