B1555

DTC Troubleshooting: B1555

DTC B1555:

Automatic Lighting Control Unit Lost Communication With the MICU (HLSW 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. Check for DTCs with the HDS.

Is DTC B1155 also indicated with DTC B1555 ?

YES -

Go to the MICU input test. Exterior Lights (MICU) Input Test

NO -

Go to step 4.

4. Measure the voltage between automatic lighting control unit 14P connector terminals No. 1 and No. 8, and terminals No. 7 and No. 9 respectively.





Is there battery voltage?

YES -

Replace automatic lighting control unit Service and Repair.�

NO -

Repair an open in the wire, a blown No. 36 (10 A) fuse or No. 10 (7.5 A) fuse in the under-dash fuse/relay box, or poor ground (G401).�