DTC Troubleshooting: U3003-68
DTC U3003-68: Electric Parking Brake Control Unit Internal Circuit Malfunction (Power Self-Holding Circuit)
NOTE: Before you troubleshoot, review the general troubleshooting information.

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

1.
Problem verification:

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:

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):

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):

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).?