Immobilizer System

DTC U0199: Immobilizer-keyless 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.

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Wait for 6 seconds or more.
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. If the tests prove OK, replace the power window master switch.

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.