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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1581 (Perimeter Anti-Theft Alarm (Except Electric)) >> Description And Operation >> Perimeter Anti-Theft Alarm - System Operation and Component Description >> Component Description >> Hood Switch

Hood Switch

WARNING: This page is about a different car, the 2018 Ford Focus. However, it is still accessible from the selected car via links, so may be relevant.

The hood ajar switch is a single pole switch (integrated into the hood latch) that is normally closed when the hood is closed, routing the voltage signal to ground. When the hood is opened, the hood ajar switch opens, interrupting the signal to indicate an open hood.

The BCM sends a voltage reference signal to the hood ajar switch, and based on the input, the BCM determines if the hood is open or closed.