DTC U3003-68 (Electric Parking Brake Control Unit)

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

DTC (Electric parking brake)

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 the ON mode.

   -4. Check for DTCs with the HDS.

   DTC Description	DTC
   U3003-68 Electric Parking Brake Control Unit Internal Circuit Malfunction (Power Self-Holding Circuit)

   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 .

2. Fuse check

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Check the following fuses.

   Fuse	No. B5 (30 A)
   	No. B6 (30 A)
   Location	Main under-hood fuse box

   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 the short to ground on the No. B5 (30 A), No. B6 (30 A) fuse 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.

   Test condition	Vehicle OFF (LOCK) mode
   	Electric parking brake control unit 30P connector: disconnected
   Test circuit	+B EPB L
   Test point 1	Electric parking brake control unit 30P connector No. 1 (WHT)
   Test point 2	Body ground

   Test circuit	+B EPB R
   Test point 1	Electric parking brake control unit 30P connector No. 3 (YEL)
   Test point 2	Body ground

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

   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 wire between the electric parking brake control unit and the B5 (30 A) or No. B6 (30 A) fuse in the main under-hood fuse box.

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.

   Test condition	Vehicle ON mode
   Test circuit	GND
   Test point 1	Electric parking brake control unit 30P connector No. 5 (BLK)
   Test point 2	Body ground

   Test circuit	GND
   Test point 1	Electric parking brake control unit 30P connector No. 7 (BLK)
   Test point 2	Body ground

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

   Is there 0.1 V or more?

   YES 

   Repair an open in the wire between the electric parking brake control unit and body ground (G705).

   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 the ON mode.

   -3. Check for DTCs with the HDS.

   DTC Description	DTC
   U3003-68 Electric Parking Brake Control Unit Internal Circuit Malfunction (Power Self-Holding Circuit)

   Is DTC U3003-68 indicated?

   YES 

   Check for loose terminals and poor connections at the electric parking brake control unit. If the electric parking brake control unit was updated, substitute a known-good electric parking brake control unit , then retest. If the electric parking brake control unit was substituted, go to step 1.

   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 .