Fog Light Switch (88)

Fog Light Switch (88)

Light switch unit (684), manual headlamp levelling







Light switch unit (684), automatic headlamp levelling (AHL)







Main task
Used to activate front fog lights. BCM sends button status on the bus.

Type
The light switch has a button with return spring for the front fog lights. When the button is depressed, pin 3 is grounded. The button has an internal diagnostic resistor. When the button is not depressed, only the internal resistor (1.8 k ohm) is connected between the connection and ground.

Connection

Pin No. 1-3:

Diagram: