DTC: B12C5 (2013 2014 2015)

DTC B12C5  : Engine Start/Stop Switch Failure

DTC (Power Control Unit)

1. Problem verification

   -1. Clear the DTCs with the HDS.

   -2. Press the engine start/stop button at least 20 times, then wait for at least 20 seconds.

   -3. Check for DTCs with the HDS.

   DTC Description	DTC
   B12C5 Engine Start/Stop Switch Failure

   Is DTC B12C5 indicated?

   YES 

   Go to step 2.

   NO 

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

2. Engine start/stop switch operation check

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

   -2. Do the engine start/stop switch test .

   Is the engine start/stop switch OK?

   YES 

   Go to step 3.

   NO 

   Replace the engine start/stop switch .

3. Open wire check (+B SMART line)

   -1. Reconnect the engine start/stop switch 10P connector.

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

   Test condition	OFF mode
   Test circuit	+B SMART
   Test point 1	Engine start/stop switch 10P connector No. 5 (YEL)
   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 4.

   NO 

   Repair an open or high resistance in the wire.

4. Open wire check (GND line)

   -1. Press and hold the engine start/stop button.

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

   Test condition	ON mode
   Test circuit	GND
   Test point 1	Engine start/stop switch 10P connector No. 2 (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 5.

   NO 

   Repair an open or high resistance in the ground wire or poor ground (G506).

5. Shorted wire check (SS2 (-), SS1 (+) lines)

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

   -2. Disconnect the following connectors.

   Engine start/stop switch 10P connector

   Power control unit connector C (36P)

   -3. Check for continuity between test points 1 and 2 individually.

   Test condition	OFF mode Engine start/stop switch 10P connector: disconnected Power control unit connector C (36P): disconnected
   Test circuit	SS2 (-)
   Test point 1	Engine start/stop switch 10P connector No. 1 (GRY)
   Test point 2	Body ground

   Test circuit	SS1 (+)
   Test point 1	Engine start/stop switch 10P connector No. 4 (GRN)
   Test point 2	Body ground

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

   Is there continuity?

   YES 

   Repair short to ground in the wire.

   NO 

   The SS2 (-) and SS1 (+) wires are not shorted. Go to step 6.

6. Open wire check (SS2 (-), SS1 (+) lines)

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

   Test condition	OFF mode Engine start/stop switch 10P connector: disconnected Power control unit connector C (36P): disconnected
   Test circuit	SS2 (-)
   Test point 1	Engine start/stop switch 10P connector No. 1 (GRY)
   Test point 2	Power control unit connector C (36P) No. 12 (GRY)

   Test circuit	SS1 (+)
   Test point 1	Engine start/stop switch 10P connector No. 4 (GRN)
   Test point 2	Power control unit connector C (36P) No. 11 (GRN)

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

   Is there continuity?

   YES 

   The SS2 (-) and SS1 (+) wires are OK. Replace the power control unit .

   NO 

   Repair an open or high resistance in the wire.