DTC Troubleshooting: B1900

DTC B1900:  Communication Bus Line Error

1.Clear the DTCs with the HDS.

2.Turn the ignition switch OFF, and then back ON (II).

3.Wait for 6 seconds or more.

4.Check for DTCs with the HDS.

Are DTCs B1000, B1008, B1011, B1032 and B1900 all indicated?


YES - Troubleshoot DTC B1000.n


NO - If only DTC B1900 is indicated, replace the immobilizer-keyless control unit. If DTCs are not indicated, it's an intermittent failure, the system is OK at this time. Check for loose or poor connections at the immobilizer-keyless control unit 7P connector, and at the under-dash fuse/relay box connector Q (16P).n