Honda HR-V: DTC Troubleshooting U3003-68: Electric Parking Brake Control Unit Internal Circuit Malfunction (Power Self-Holding Circuit)

NOTE: Before you troubleshoot, review the how to troubleshoot the electric parking brake system.

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.

Is DTC U3003-68 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. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the Freeze data/on-board snapshot.

2. Fuse check:

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

Are the fuses OK?

YES

The fuse is OK. Reinstall the fuse, then go to step 3.

NO

Replace the fuse. If the fuse blows again, repair a short to ground in the No. D2-5 (30 A) and/or No. D2-2 (30 A) fuses circuit.

3. Open wire check (+B EPB L, +B EPB R lines):

1. Disconnect the following connector.

Electric parking brake control unit 30P connector

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

Is there battery voltage?

YES

The +B EPB L and +B EPB R wires are OK. Go to step 4.

NO

Repair an open or high resistance in the +B EPB L, +B EPB R wires between the electric parking brake control unit and the No. D2-2 (30 A) and/or No. D2-5 (30 A) fuses in the auxiliary under-dash fuse box A.

4. Open wire check (GND lines):

1. Reconnect the following connector.

Electric parking brake control unit 30P connector

2. Turn the vehicle to the ON mode.
3. Measure the voltage between test points 1 and 2.

Is there 0.1 V or more?

YES

Repair an open in the GND wires between the electric parking brake control unit and body ground (G503).

NO

The GND wires are OK. Go to step 5.

5. Electric parking brake control unit check (update or substitution):

1. Update the electric parking brake control unit if it does not have the latest software. If the unit already has the latest software, substitute a known-good electric parking brake control unit.
2. Turn the vehicle to the OFF (LOCK) mode, then to the ON mode.
3. Check for DTCs with the HDS.

Is DTC U3003-68 indicated?

YES

Check for loose terminals and poor connections in the electric parking brake control unit 30P connector.

If the electric parking brake control unit was updated, substitute a known-good electric parking brake control unit and recheck. If the electric parking brake control unit was substituted and the symptom/indication is still present, replace the original electric parking brake control unit.

NO

If the electric parking brake control unit was updated, troubleshooting is complete. If the electric parking brake control unit was substituted, replace the original electric parking brake control unit.

READ NEXT: