Honda HR-V: DTC B12C5 Engine Start/Stop Switch Failure

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 - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks.

1. Problem verification:

1. Clear the DTCs with the HDS.

Clear DTCs

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.

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. Determine possible failure area (+B SMART line, SSB GND line, or other):

1. Turn the vehicle to the OFF (LOCK) mode.
2. Disconnect the following connector.

Engine start/stop switch 10P connector

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

Is there battery voltage?

YES

The +B SMART and SSB GND wires are OK. Go to step 3.

NO

Go to step 6.

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

1. Disconnect the following connector.

Keyless access control unit connector B (36P)

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

Is there continuity?

YES

Repair short to ground in the wire.

NO

The SS2 (-) and SS1 (+) wires are not shorted. Go to step 4.

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

Check for continuity between test points 1 and 2 respectively.

Is there continuity?

YES

The SS2 (-) and SS1 (+) wires are OK. Go to step 5.

NO

Repair an open or high resistance in the wire.

5. Engine start/stop switch check:

Do the engine start/stop switch test.

Is the engine start/stop switch OK?

YES

Replace the keyless access control unit.

NO

Replace the engine start/stop switch.

6. Open wire check (+B SMART line):

Measure the voltage between test points 1 and 2.

Is there battery voltage?

YES

Repair an open or high resistance in the SSB GND wire.

NO

Repair an open or high resistance in the +B SMART wire.

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