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.
Power Source Mode does not Change to ON (ACC) [11/2018 - ]: Description
If the engine switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode.
| Problem Symptom | Data List and Active Test |
|---|---|
| Power source mode does not change to on (ACC) but does change to on (IG) | Power Source Control
|
HINT:
Use this procedure to troubleshoot the malfunction that ACC mode of all the ECUs is not available.
When ACC mode of some ECUs is not available, check the ACC power source circuit related to the malfunctioning ECUs.
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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.