DTC Troubleshooting: B1255

DTC B1255: Combination Switch Control Unit Lost Communication With MICU Clear the DTCs using the HDS. Cycle the ignition switch to OFF, and then back ON. Check the DTCs by selecting the DTCs MENU (DTCs) from the HDS. Is DTC B1255 indicated?
YES | - | Go to Step 4 .
NO | - | Intermittent failure, MICU is OK at this time.■
Check for DTCs in the combination switch control unit by selecting the DTCs MENU (DTCs) from the HDS. Is DTC B1055, and B1157 indicated?
YES | - | Go to MICU input test. ■
NO | - | Replace the combination switch control unit .■