B1005

DTC B1005: MICU Lost Communication with Relay Control Module

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

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 B1005 indicated?

YES - Go to step 4.

NO - Intermittent failure, the relay control module is OK at this time. Check for loose or poor connection at relay control module connector K (10P), and at under-dash fuse/relay box connector D (17P). If the connections are good, check the battery condition and the charging system.

4. Check for DTCs with the HDS.

Is DTC B1158 also indicated?

YES - Go to Relay Control Module Input Test. Relay Control Module Input Test

NO - Check for an open or loose connection in the communication circuit between the MICU and the relay control module. If the circuit is OK, replace the MICU. If the circuit is bad, repair the open.