B1005

DTC B1005: MICU Lost Communication with Relay Control Module

1. Clear the DTCs using the HDS.
2. Cycle the ignition switch to OFF and then back ON.
3. Check for DTCs using the HDS.

Is DTC B1005 indicated?

YES - Go to step 4.

NO - Intermittent failure, the relay module is OK at this time. Check for loose or poor connections. If the connections are good, check the battery condition and the charging system.

4. Check for DTCs in the gauge control module using the HDS.

Is DTC B1158 indicated?

YES - Go to Relay Control Module Input Test

NO - Check for an open, or a short to power or ground 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, or short to power or ground.