B1000

DTC Troubleshooting: B1000

DTC B1000:

Communication circuit error (BUS Off)

NOTE: If you are troubleshooting multiple DTC's, be sure to follow the instruction 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 B1000 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time. Check for loose or poor connections, or worn/shorted wires. If the connections are good, check the battery condition Battery Test and the charging system.

5. Turn the ignition switch to LOCK (0).

6. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected.





Is DTC B1000 indicated with each individual unit disconnected?

YES -

Go to step 7.

NO -

Go to the input test for the control unit that was disconnected when DTC B1000 did not reset and perform all power and ground input tests. If the tests prove OK, replace that unit.

- Gauge control unit input test Component Tests and General Diagnostics
- Immobilizer-keyless control unit input test Immobilizer-Keyless Control Unit Input Test

7. Turn the ignition switch to LOCK (0).

8. Disconnect each control unit connector in the table.






9. Disconnect under-dash fuse/relay box connector Q (16P).

10. Check for continuity between under-dash fuse/relay box connector Q (16P) terminal No. 3 and body ground.





Is there continuity?

YES -

Repair a short to ground in the wire.

NO -

Go to step 11.

11. Turn the ignition switch to ON (II).

12. Measure the voltage between under-dash fuse/relay box connector Q (16P) terminal No. 3 and body ground.





Is there voltage?

YES -

Repair a short to power in the wire between the under-dash fuse/relay box and the affected control unit.

NO -

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

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