DTC Troubleshooting: B1009

DTC B1009: MICU Lost Communication with the Combination Switch Control Unit (Wiper/Washer Switch Message) Clear the DTCs using the HDS. Cycle the ignition switch to OFF, and then back ON. Check for DTCs by selecting the DTCs MENU (DTCs) from the HDS. Is DTC B1009 indicated?
YES | - | Go to Step 4 .
NO | - | Intermittent failure, the combination switch control unit is OK at this time.■
Check for DTCs of the gauge control module and relay module by selecting the DTCs MENU (DTCs) from the HDS. Is DTC B1156 and B1063 indicated?
YES | - | Go to the combination switch control unit input test. ■
NO | - | Check for an open, or a short to power or ground in the communication circuit between the MICU and the door multiplex control unit. If the circuit is OK, replace the MICU. If the circuit is bad, repair the open, or short to power or ground.■