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.
ECU Power Source Circuit [08/2014 - ]: Description
When the power switch is turned on (IG), current flows from the IG2D terminal of the power management control ECU to the IG2 relay. This closes the IG2 relay contact points and sends the IG2 signal to the IG2 terminal of the plugin charge control ECU assembly. The plugin charge control ECU assembly supplies the charging power to the +B1 terminal by allowing current to flow into the MREL terminal and closing the PIMR relay. However, during plug-in charging, only the PIMR relay is closed and the IG2 relay is open.
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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.
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