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

WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. 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).
Wait for at least 6 seconds.
Check for DTCs with the HDS.
Is DTC B1905 indicated?

YES -Go to step 5.

NO -Intermittent failure, the immobilizer-keyless control unit is OK at this time. Check for loose or poor connections between the immobilizer-keyless control unit and the MICU.
Check for DTCs with the HDS.
Are DTCs B1155, B1156, B1157, B1159, and B1160 all indicated with DTC B1905 at the same time?

YES -Faulty MICU; replace the under-dash fuse/relay box.
- USA models (see REMOVAL AND INSTALLATION )
- Canada models (see CANADA MODELS )
NO -Replace the immobilizer-keyless control unit (see IMMOBILIZER-KEYLESS CONTROL UNIT REPLACEMENT ).