Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Troubleshooting - B-CAN System Diagnosis Test Mode B
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 (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
- Using the HDS, select the system that has the symptom from the BODY ELECTRICAL system select menu.
- Select DTCs, and then check for loss of communication DTCs.
Are any loss of communication DTCs indicated?
YES -Go to step 3.
NO -Faulty MICU, replace the under-dash fuse/relay box (see REMOVAL AND INSTALLATION )M
- Do the power, ground, and communication part of the input test for the unit(s) not communicating with the HDS.NOT COMMUNICATING UNITS LIST
Unit not communicating MICU (see MICU INPUT TEST ) Gauge control module (see GAUGE CONTROL MODULE INPUT TEST ) Immobilizer-keyless control unit (see IMMOBILIZER-KEYLESS CONTROL UNIT INPUT TEST ) Automatic lighting control unit (see AUTOMATIC LIGHTING CONTROL UNIT INPUT TEST/REPLACEMENT ) HandsFreeLink control unit (see CONTROL UNIT INPUT TEST/REPLACEMENT ) Climate control unit troubleshooting (see DTC INDICATOR G: CLIMATE CONTROL UNIT INTERNAL ERROR )
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.