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DTC Advanced Diagnostics: U3003-16
DTC U3003-16: Electric Parking Brake Control Unit Power Source Circuit (+B) Low Voltage
NOTE
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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. |
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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. |
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Review "How to troubleshoot the VSA system" before doing the DTC troubleshooting procedure. |
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Test-drive the vehicle according to local traffic conditions and regulations. Do not test-drive on a lift unless specified. |
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The possible causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes. |
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Confirmation Procedure |
With the Driving Pattern:
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1. |
Start the engine. |
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2. |
Wait 15 seconds or more. | |
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Execution |
Regular Diagnosis |
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Duration |
About 15 seconds |
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DTC Type |
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1 drive cycle |
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Brake system indicator (red) blink (Dependant upon the conditions) |
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Brake system indicator (amber) on | |
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Fail Safe Action |
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Stop automatic brake hold function (Dependant upon the conditions) |
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Stop manual operating function |
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Stop automatic operating function (Drive away assist) (Dependant upon the conditions) |
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Stop automatic operating function (Request from other system) (Dependant upon the conditions) |
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Stop ignition OFF apply function (Dependant upon the conditions) |
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Stop emergency brake function (Dependant upon the conditions) |
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Stop ACC function (Dependant upon the conditions)* |
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Stop CMBS function (Dependant upon the conditions)* | |
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Possible Cause |
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Poor connection between the VSA modulator-control unit and the under-hood fuse/relay box (+B ABS/VSA FSR line) |
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PGM-FI system failure |
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Abnormal 12 volt battery |
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VSA modulator-control unit internal failure | | |
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