Keyless Access Control Unit

DTC Troubleshooting: U1283 (Keyless Access Control Unit)

DTC U1283: Keyless Access 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. 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 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 (33P) and the related units.