Theory Of Operation
WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.
When Left or Right Turn Signal Lamp illumination is requested, the Left Multi-Function Switch sends a hard-wired signal to the Body Control Module (BCM). When the BCM receives this signal, the BCM provides a Pulsed Width Modulated (PWM) voltage, through the Front and Rear Turn Lamp Driver circuits to the Front Lamp Assemblies and Rear Tail Lamp Assemblies and if equipped, through the Mirror Turn Signal Driver circuits to the Driver or Passenger Exterior Rearview Mirrors.