B1007

DTC Troubleshooting: B1007

DTC B1007: MICU Lost Communication with Combination Switch Control Unit (HLSW 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 B1007 indicated?
YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections between the MICU and the combination switch control unit, if the connections are good, check the battery condition Testing and Inspection and the charging system.


5. Check for DTCs with the HDS.

Are DTCs B1062, B1155, and B2108 all indicated?
YES - Do the combination switch control unit input test. Combination Switch Control Unit Input Test

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