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.
System Description
- LIN COMMUNICATION SYSTEM DESCRIPTION
The multiplex communication system (LIN) is used to control communication between the ECUs of the body system. If communication cannot be performed through the LIN because of an open in the communication lines or other reason, the master control ECU of the relevant system will output a DTC. For the communication system and the connected ECUs, refer to the table below.
HINT:
Each ECU has a fail safe function which activates to maintain the minimum performance of the system and protect the system.
- LIN Communication Certification System
ECU Master Control
(LIN Communication DTC Output Function)Certification ECU (Smart Key ECU Assembly) ◦ (with output function) Main Body ECU (Instrument Panel Junction Block) ◦ (with output function) Steering Lock ECU (Steering Lock Actuator Assembly) x (no output function) ID Code Box (Immobilizer Code ECU) x (no output function)
- LIN Communication Certification System
Use the Manual With the Right Hardware
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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.