Date registered: May 2007
Vehicle: 2004 C230 Kompressor Sport Coupe
Location: Olympia, WA
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
The SAM is a computer de-multiplexer. Basically all the control devices (switches) on the car are hooked to the front or rear SAM. Then, all the devices that need to be controlled (lights, motors) are hooked to the front or rear SAM. When you, as an example, step on the brake pedal, the front SAM notices this, generates a command that it sends over the CAN-bus to the rear SAM, and the rear SAM turns on the brake lights. When you switch on the turn signal, that signal goes to the front SAM, which sends commands to the instrument cluster and the rear SAM. The front SAM starts blinking the front turn signals and mirror signals. The rear SAM starts blinking the rear turns signals. The cluster makes the clicking sound and blinks the indicator light. This all seems very complex but it actually simplifies the wiring of the car. If you peek under the dash it's nothing compared to a mid-90s MB, where everything had to run everywhere.