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Home >> Lincoln >> 2018 >> MKZ Select, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1575 (Information And Entertainment System - General Information - Vehicles With: SONY Audio System (Except Electric) (1 Of2)) >> Description And Operation >> Information and Entertainment System - System Operation and Component Description >> Component Description >> Steering Wheel Switches

Steering Wheel Switches

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 RH steering wheel switches contain series of resistors. Each steering wheel switch function corresponds with a specific resistance value within the switch.

The APIM sends a 5-volt reference voltage to the RH steering wheel switches on the input circuit. When a switch is pressed, the voltage is routed through the corresponding resistor(s), through the return circuit, and then to ground through the APIM. The APIM monitors the resultant voltage drop to determine which switch was pressed. The voltage drop varies depending upon the resistance of the specific switch pressed.

The steering wheel switch inputs are sent as network messages from the APIM to the ACM to control audio functions.

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