Door Multiplex Control Unit

DTC Troubleshooting: U1283 (Door Multiplex Control Unit)

DTC U1283: Door Multiplex Control Unit Lost Communication With Passenger's MICU

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. Turn the ignition switch to LOCK (0) and then back to ON (II).

3. Wait for at least 6 seconds.

4. Check for DTCs with the HDS.

Is DTC U1283 indicated?
YES - Go to the passenger's MICU input test, and do all power, ground and communication input tests. Multiplex Integrated Control System MICU Input Test If the tests prove OK, replace the passenger's under-dash fuse/relay box. Passenger's Under-Dash Fuse/Relay Box (MICU) Removal/Installation

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at passenger's under-dash fuse/relay box connector A (38P) and the related units.