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.
Check internal errors of CAN communication units
- Connect GDS.
- IG "ON" and engine "OFF".
- Select "DTC Analysis" mode.
- Disconnect CAN communication units one by one and monitor DTC to find the cause.
* CAN communication units: BCM (Body Control Module), DDM (Drive Door Module), ADM (Assist Door Module), PSM (Power Seat Module), SJB (Smart Junction Box), SMK (Smart Key Module)
- Is the code erased?
YES
- Substitute with a known - good unit and check for proper operation.
If the problem is corrected, replace the unit and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Substitute with a known - good unit and check for proper operation.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.