B1550

DTC B1550: Communication Bus Line Error

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A.

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 HD.

Is DTC B1550 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for loose or poor connections at the automatic lighting control unit connector (14P), and at driver's under-dash fuse/relay box connector X (39P).

5. Check for DTCs with the HDS.

Is DTC B1000 also indicated?

YES - Troubleshoot DTC B1000.

NO - If only B1550 is indicated, replace the automatic lighting control unit.