B1906

DTC Troubleshooting: B1906

DTC B1906: Immobilizer-Keyless Control Unit Lost Communication with Gauge Control Module (A/T 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 6 seconds or more.

4. Check for DTCs with the HDS.

Is DTC B1906 indicated?
YES - Go to step 5.

NO - Intermittent failure, the gauge control module is OK at this time. Check for loose or poor connections at the gauge control module 36P connector, at the immobilizer-keyless control unit 7P connector, and at under-dash junction box connectors G, J and C.


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

6. Connect the HDS to the data link connector, then turn the ignition switch to ON (II).

7. Select the BODY ELECTRICAL menu, then enter UNIT INFORMATION.

8. Check the condition of the gauge control module from the CONNECTED UNIT list.

Is NOT AVAILABLE indicated?
YES - Go to step 9.

NO - Replace the immobilizer-keyless control unit.


9. Do the gauge control module input test. Component Tests and General Diagnostics

Are all inputs OK?
YES - Go to step 10.

NO - Repair the faulty input, then recheck the DTCs.


10. Disconnect immobilizer-keyless control unit 7P connector.

11. Disconnect gauge control module 36P connector.

12. Check for continuity between immobilizer-keyless control unit 7P connector terminal No. 4 and gauge control module 36P connector terminal No. 30.

Is there continuity?
YES - Replace the gauge control module.

NO - Repair an open in the wire between the immobilizer-keyless control unit and gauge control module.