DTC U3003-16 (VSA Control Unit)

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DTC U3003-16 : Electric Parking Brake Control Unit Power Source Circuit (+B) Low Voltage

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	With the Driving Pattern: Turn the vehicle to the READY TO DRIVE mode. Wait 15 seconds or more.
Execution	Regular Diagnosis
Duration	About 15 seconds
DTC Type	1 drive cycle Brake system indicator (red) blink (Dependant upon the conditions) Brake system indicator (amber) on
Fail Safe Action	Stop electric parking brake function (some of function)
Possible Cause	Poor connection between the VSA modulator-control unit and the under-hood fuse/relay box (+B_ABS/VSA_FSR line) Electric powertrain system failure Abnormal 12 volt battery VSA modulator-control unit internal failure