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 A
Check the PCM for DTCs and troubleshoot PCM (see GENERAL TROUBLESHOOTING INFORMATION ) or F-CAN loss of communication errors first, then do this diagnosis if the symptom is related to the B-CAN system.
- Compare the symptom with this list of B-CAN related systems:
- Gauge control module
- Immobilizer
- Climate control
- HandsFreeLink
- Exterior lights
- Entry light control
- Turn signal/hazard warning lights
- Horn (security and panic)
- Wiper/washer
- Power windows
- Security
- Keyless entry
- Power door locks
- Key interlock
Is the symptom related to the B-CAN system?
YES -Go to step 2.
NO -Go to the for the system with the symptom.
- Connect the HDS to the data link connector (A), then turn the ignition switch to ON (II).
- From the BODY ELECTRICAL menu, select UNIT INFORMATION, and then select CONNECTED UNITS listed to see if the following control units are communicating with the HDS.
- MICU
- Gauge control module
- Immobilizer-keyless control unit
- Climate control unit
- HandsFreeLink control unit
NOTE:- If a unit is communicating with the HDS, DETECT will be displayed.
- If a unit is not communicating or the vehicle is not equipped, "Not Available" will be displayed.
- The HDS only checks the connected units status one time when BODY ELECTRICAL is selected. To recheck the status after repair, reboot the HDS and repeat step 3.
Are all control units communicating with the HDS?
YES -Go to step 4.
NO -If any of the control units are not communicating, go to B-CAN System Diagnosis Test Mode B (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE B ). If all units are not communicating or only the MICU is communicating, go to DTC B1000 troubleshooting (see DTC B1000: COMMUNICATION CIRCUIT ERROR (BUS-OFF) ).
- Select the system that has the problem from the BODY ELECTRICAL menu, then select DTCs.
Are any DTCs indicated?
YES -Go to step 5.
NO -If the problem is related to one of the following items and the system that is malfunctioning does not stop or turn off, go to B-CAN System Diagnosis Test Mode C (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE C ). If the problem is related to one of the following items and the system that is malfunctioning does not work or turn on, go to B-CAN System Diagnosis Test Mode D (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE D ).
- Exterior lights
- Entry light control
- Horn (security and panic)
- Wiper/washer
- Power windows
- Power door locks
- Turn signal/hazard warning lights
- Key interlock
If the problem is related to one of the following items, go to the troubleshooting for that individual system.
- Gauge control module
- Immobilizer
- Climate control
- HandsFreeLink
- Security
- Keyless entry
- Record all DTCs, and sort them by DTC type into these categories:
- Battery voltage DTCs.
- Internal error DTCs.
- Loss of communication DTCs.
- Signal error DTCs.
- Troubleshoot the DTC(s) in the order listed above.
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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.