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.
MICU Control Functions: Notes
The MICU (built into the under-dash fuse/relay box) is one of the B-CAN system components. The MICU controls many systems related to the body controller area and security system, and also works as a gateway to diagnose the other B-CAN connected ECUs with the HDS.
The MICU also controls the function of these circuits:
Refer to each system circuit diagram for details.
- Entry lights control (individual map lights and ceiling light)
- Exterior lights control (including the daytime running lights control and back-up lights)
- Interlock system
- Keyless entry
- Power door locks
- Security alarm
- Turn signal/hazard warning lights
- Tailgate actuator
- Automatic lighting
- Impact sensing door lock release
- Door mirror switch
- IMOCD(S-NET)
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.