| 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 witch 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 also indicated with DTC B1905? YES - Faulty MICU; replace the under-dash fuse/relay box.n NO - Replace the immobilizer-keyless control unit.n |