DTC Troubleshooting: U3003-16
DTC U3003-16: Electric Parking Brake Control Unit Power Source Circuit (+B) Low Voltage
NOTE: Before you troubleshoot, review the general troubleshooting information.

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

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 start the engine.

?4.
Check for DTCs with the HDS.
DTC Description
DTC
Freeze Frame
U3003-16 Electric Parking Brake Control Unit Power Source Circuit (+B) Low Voltage
    

Is DTC U3003-16 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.
VSA modulator-control unit check:

VSA modulator-control unit check
?1.
Check and note the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
BATTERY VOLTAGE
    

?2.
Using a voltmeter, measure and note the voltage across the 12 volt battery terminals.
NOTE: If the voltage is below 9.5 V, check the 12 volt battery, and check for any PGM-FI system DTCs.

?3.
Compare the voltage noted in step 2-1 to the voltage in step 2-2.

Is the difference between the two voltage readings less than 3 V?

     
YES
     
     
     
     
NO
     
     
     
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.?