Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not Communicating

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 Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS) Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not Communicating Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode C - No DTCs and Output Won't Shut OFF Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode D - No DTCs and Output Won't Turn ON  .

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 under-dash fuse/relay box .

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