Keyless Access Control Unit

DTC Troubleshooting: U0199

DTC U0199:

Keyless Access Control Unit Lost Communication With Door Multiplex Control Unit

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Clear the DTCs with the HDS.

2. Press the engine start/stop button to select the OFF, ACC, and ON mode.

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC U0199 indicated?

YES -

Go to the door multiplex control unit input test, and do all power, ground, and communication input tests Power Window Master Switch Input Test. If the tests prove OK, replace the power window master switch Power Window Master Switch Replacement.�

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections at the door multiplex control unit and the related units.�