DTC Troubleshooting: B1200 (K+AUTO)

DTC B1200:  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 B1200 all indicated?


YES - Troubleshoot DTC B1000.n


NO - If only DTC B1200 is indicated, replace the climate 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 climate control unit 32P connector, and at the under-dash fuse/relay box connector Q (16P).n