DTC Troubleshooting: B1905

DTC B1905:  Immobilizer-Keyless Control Unit Lost Communication with MICU (DRLOCKSW Message)

1.Clear the DTCs with the HDS.

2.Turn the ignition switch OFF, and then back ON (II).

3.Check for DTCs with the HDS.

Is DTC B1905 indicated?


YES - Go to 4.


NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the immobilizer-keyless control unit 7P connector, and at the under-dash fuse/relay box connector Q (16P).n


4.Check for DTCs with the HDS.

Is DTC B1160 and B1905 indicated?


YES - Faulty MICU; replace the under-dash fuse/relay box.n


NO - Replace the immobilizer-keyless control unit.n