Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not Communicating (2017 2018 2019 2020)

Do this diagnosis if any of the control units are not communicating ("Not Available" is displayed in the HDS) as found by the B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks (2017 2018 2019 2020), 

1. Using the HDS, select the system that has the symptom from the BODY ELECTRICAL SYSTEM SELECT menu.

2. Select DTCs, and then check for loss of communication DTCs.

• If any loss of communication DTCs are indicated, go to step 3.
• If any loss of communication DTCs are not indicated, faulty MICU; replace the driver's under-dash fuse/relay box - Refer to: Driver's Under-Dash Fuse/Relay Box Removal and Installation, or Passenger's Under-Dash Fuse/Relay Box Removal and Installation .

3. Do the power, ground, and communication part of the input test for the unit (s) not communicating with the HDS.