Honda HR-V Owners & Service Manuals

Honda HR-V: DTC Troubleshooting 51-12: Motor Power Source Circuit Malfunction

Honda HR-V (2015-2021) Service Manual / Brakes / VSA System - Diagnostics / DTC Troubleshooting / DTC Troubleshooting 51-12: Motor Power Source Circuit Malfunction

NOTE: Before you troubleshoot, review the general troubleshooting information.

VSA System - Diagnostics

1. Problem verification:

  1. Turn the vehicle to the ON mode.
  2. Clear the DTC with the HDS.
  3. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.
  4. Check for DTCs with the HDS.

VSA System - Diagnostics

Is DTC 51-12 indicated?

YES

The failure is duplicated. Go to step 2.

NO

Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting.

2. Fuse check:

  1. Turn the vehicle to the OFF (LOCK) mode.
  2. Check the following fuse.

VSA System - Diagnostics

Is the fuse OK?

YES

The fuse is OK. Reinstall the fuse, then go to step 5.

NO

Go to step 3.

3. Shorted wire check (+B ABS/VSA MTR line):

  1. Disconnect the following connector.

VSA modulator-control unit 21P connector

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

VSA System - Diagnostics

Is there continuity?

YES

Repair a short to body ground in the +B ABS/VSA MTR wire between the No. D1-4 (40 A) fuse in the auxiliary under-dash fuse box A and the VSA modulator-control unit.

NO

The +B ABS/VSA MTR wire is OK. Install a new No. D1-4 (40 A) fuse in the auxiliary under-dash fuse box A, then go to step 4.

4. VSA modulator-control unit check:

  1. Reconnect the following connector.

VSA modulator-control unit 21P connector

  1. Turn the vehicle to the ON mode.
  2. Clear the DTC with the HDS.
  3. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.
  4. Check for DTCs with the HDS.

VSA System - Diagnostics

Is DTC 51-12 indicated?

YES

Go to step 5.

NO

The troubleshooting is complete.

5. Open wire check (+B ABS/VSA MTR line):

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

VSA modulator-control unit 21P connector

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

VSA System - Diagnostics

Is there battery voltage?

YES

The +B ABS/VSA MTR wire is OK. Go to step 6.

NO

Repair an open in the +B ABS/VSA MTR wire between the No. D1-4 (40 A) fuse in the auxiliary under-dash fuse box A and the VSA modulator-control unit.

6. VSA modulator-control unit check (update):

  1. Reconnect the following connector.

VSA modulator-control unit 21P connector (if disconnected)

  1. Update the VSA modulator-control unit if it does not have the latest software.
  2. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.
  3. Check for DTCs with the HDS.

VSA System - Diagnostics

Is DTC 51-12 indicated?

YES

Check for loose terminals in the VSA modulator-control unit 21P connector. If the VSA modulator-control unit was updated and the symptom/indication is still present, replace the VSA modulator-control unit.

NO

Troubleshooting is complete. If any other DTCs are indicated, go to the indicated DTCs troubleshooting.

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