B1905

DTC Troubleshooting: B1905

DTC B1905:

Immobilizer Unit Lost Communication With MICU (Door Lock Switch Message)

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 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.�

5. Check for DTCs with the HDS.

Is DTC U1281 also indicated with DTC B1905?

YES -

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

- USA models Under-Dash Fuse/Relay Box Removal And Installation (USA Models)
- Canada models Under-Dash Fuse/Relay Box Removal And Installation (Canada Models)

NO -

Replace the immobilizer-keyless control unit Service and Repair.�