DTC B12F0: Power Control Unit Lost Communication With Electric Steering Lock

DTC (Power Control Unit)

1. Problem verification 1

   -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
   B12F0 Power Control Unit Lost Communication With Electric Steering Lock

   Is DTC B12F0 indicated?

   YES 

   Go to step 2 below.

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

2. Open wire check (+B SMART line)

   -1. Press the engine start/stop button to select the OFF mode.

   - 2. Disconnect the following connector.

   Electric steering lock 12P connector

   - 3. Measure the voltage between test points 1 and 2.

   Test condition	OFF mode Electric steering lock 12P connector: disconnected
   Test circuit	+B SMART
   Test point 1	Electric steering lock 12P connector No. 3 (RED)
   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 below.

   NO 

   Repair an open or high resistance in the wire.

3. Open wire check (GND line)

   -1. 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

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

   Is there continuity?

   YES 

   The GND wire is OK. Go to step 4 below.

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G501).

4. Shorted wire check (IGN TRX line)

   -1. Disconnect the following connector.

   Keyless access control unit connector B (28P)

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

   Test condition	OFF mode Electric steering lock 12P connector: disconnected Keyless access control unit connector B (28P) : disconnected
   Test circuit	IGN TRX
   Test point 1	Electric steering lock 12P connector No. 6 (GRY)
   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 IGN TRX wire is not shorted. Go to step 5 below.

5. Open wire check (IGN TRX line)

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

   Test condition

   OFF mode Electric steering lock 12P connector: disconnected Keyless access control unit connector B (28P) : disconnected

   Test circuit	IGN TRX
   Test point 1	Electric steering lock 12P connector No. 6 (GRY)
   Test point 2	Keyless access control unit connector B (28P) No. 18 (GRY)

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

   Is there continuity?

   YES 

   The IGN TRX wire is OK. Go to step 6 below.

   NO 

   Repair an open or high resistance in the wire.

6. Power control unit and electric steering lock communication check

   -1. Reconnect these items:

   • Electric steering lock 12P connector
   • Keyless access control unit connector B (28P)

   - 2. With driver's power window open, press the engine start/stop button to select the OFF mode.

   - 3. Do the battery terminal disconnection procedure.

   - 4. Wait for at least 10 seconds to clear the DTCs.

   - 5. Do the battery terminal reconnection procedure.

   - 6. Press the engine start/stop button to select the ON mode, then select the OFF mode.

   - 7. Remove all the keyless remotes from inside the vehicle. Hold them outside the open driver's window, at least 8.0 (20 cm) away from the vehicle.

   - 8. Close all doors, then press the engine start/stop button.

   - 9. The keyless remotes bring to the vehicle inside, during close all doors.

   - 10. Touch the engine start/stop switch with the keyless remote. The buttons on the keyless remote should be facing you.

   - 11. Press and hold the engine start/stop button to select the ON mode.

   Does the mode change to ON?

   YES 

   Go to step 7 below.

   NO 

   Go to step  8

7. Problem verification 2

   -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
   B12F0 Power Control Unit Lost Communication With Electric Steering Lock

   Is DTC B12F0 indicated?

   YES 

   Replace the electric steering lock .

   NO 

   Intermittent failure, the system is OK at this time. Check for loose or poor connections.

8. Electric steering lock communication status check

   -1. Select COMMUNICATION STATUS in the INSPECTION MENU with the HDS.

   - 2. Check the value of STATUS with ESL, STATUS with KEYLESS ACCESS CONTROL UNIT, and STATUS with BACKUP CONTROL UNIT with the HDS.

   	HDS Description	Value
   Status with ESL	MTR CUT1 (Cont) Status	1
   	MTR CUT2 (IG) Status	1
   	IG1 Input State of ESL	1
   	MTRCONT Status of ESL	1
   	ESL Motor Status	1
   	Switch D detection for Unlock Status	1
   	Switch C detection for Unlock Status	1
   	Switch B detection for Unlock Status	1
   Status with KEYLESS ACCESS CONTROL UNIT	FOB KEY Authentication Result	1
   Status with BACKUP CONTROL UNIT	FOB KEY Authentication Result	1

   Are only Status with ESL 1 values indicated?

   YES 

   Replace the electric steering lock .

   NO 

   Replace the keyless access control unit .