DTC U3003-68 (VSA Control Unit)

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

NOTE:

Initial Diagnosis:
The initial on-board diagnosis occurs right after the vehicle condition is turned to the ON mode, and the ABS/VSA indicator comes on, and continues until the indicator goes off.
Regular Diagnosis:
The regular on-board diagnosis begins right after the ABS/VSA indicator goes off, and it continues until the vehicle condition is turned to the OFF (LOCK) mode.
Review "How to troubleshoot the VSA system" before doing the DTC troubleshooting procedure.
Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified.
The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Confirmation Procedure	Basic Condition: 12 volt battery voltage 9 - 16 V Operating Condition: Turn the vehicle to the ON mode. Apply and release the parking brake several times.
Execution	Initial Diagnosis
Duration	About 10 seconds
DTC Type	1 drive cycle Brake system indicator (red) flash Brake system indicator (amber) on
Fail Safe Action	An apply or release request shall lead to an apply or release of the electric parking brake actuator
Possible Cause	Open, Short to ground, or Poor connection between the VSA modulator-control unit and the under-hood fuse/relay box (+B ABS/VSA FSR line) Open or Poor connection between the VSA modulator-control unit and body ground (GND line) Blown fuse (No. B3-4 fuse ) VSA modulator-control unit internal failure