B1007

DTC B1000: Communication Bus line Error

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 B1000 indicated?

YES - Go to step 4.

NO - Intermittent failure. The communication bus line 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 using the HDS.

Are DTCs B1005, B1006, B1007, B1008, and B1010 also indicated?

YES - Go to step 5.

NO - Replace the MICU.

5. Disconnect each control unit one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected.
- Gauge control module
- Relay control module
- Door multiplex control unit
- Climate control unit
- Combination switch control unit
- HandsFreeLink control unit
- Power seat control unit

Is DTC B1000 indicated with each unit disconnected?

YES - Check for a short to power or ground in the communication circuit by disconnecting the harness at each control unit and testing "for continuity to ground or short to power. Repair or replace the harness as necessary".

NO - Replace the control unit that was disconnected, and did not set DTC B1000.

DTC B1007: MICU Lost Communication with the Combination Switch Control Unit (Headlight Switch Message)

NOTE: If you are troubleshooting multiple DTC's, be sure to follow the instructions in B-CAN system diagnosis Test Mode A.

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 B1007 indicated?

YES - Go to step 4.

NO - Intermittent failure, the MICU 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 of the gauge control module and relay control module using the HDS.

Are DTCs B1155 and B1062 also indicated?

YES - Go to the Combination Switch Control Unit Input Test. Combination Switch Control Unit Input Test

NO - Check for an open, or a short to power or ground in the communication circuit between the MICU and the combination switch control unit. If the circuit is OK, replace the MICU. If the circuit is bad, repair the open, or short to power or ground.