DTC U3003-68 (VSA Control Unit)

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

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

DTCs (VSA)

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. Apply and release the parking brake several times.

   -5. Check for DTCs with the HDS.

   DTC Description	DTC	Freeze Frame
   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 . 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 fuse.

   Fuse	No. A3-2 (40 A)
   Location	Under-hood fuse/relay 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 a short to body ground in the No. A3-2 (40 A) fuse circuit.

3. Open wire check (+B ABS/VSA FSR line)

   -1. Disconnect the following connector.

   VSA modulator-control unit 46P connector

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

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 46P connector: disconnected
   Test point 1	VSA modulator-control unit 46P connector No. 1
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The +B ABS/VSA FSR wire is OK. Go to step 4.

   NO 

   Repair an open or high resistance in the wire between the VSA modulator-control unit and the No. A3-2 (40 A) fuse in the under-hood fuse/relay box.

4. Open wire check (GND line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	VSA modulator-control unit 46P connector: disconnected
   Test point 1	VSA modulator-control unit 46P connector No. 4
   Test point 2	Body ground

   Is there continuity?

   YES 

   Check for loose terminals and poor connections in the VSA modulator-control unit 46P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the VSA modulator-control unit .

   NO 

   Repair an open in the wire between the VSA modulator-control unit and body ground (G303).