DTC U0199: Driver's MICU Lost Communication with Door Multiplex Control Unit

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A )

Clear the DTCs with the HDS
Turn the ignition switch to LOCK (0) and then back to ON (II), or press the engine start/stop button to select the OFF mode and then the ON mode
Wait for at least 6 seconds
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 (see POWER WINDOW MASTER SWITCH INPUT TEST ) If the tests prove OK, replace the power window master switch (see 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 37P connector and the related units