9-3 (9440) L4-2.0L Turbo (2.0 HOT) (2003)
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Headlamp Switch: Description and Operation
Light Switch, (10)
Light Switch, (10)
Light switch unit (684), manual headlamp levelling
Light switch unit (684), automatic headlamp levelling (AHL)
Main task
Use to select light setting off, parking, or headlamps. BCM sends the switch status on the bus.
Type
The rotary switch has three positions for the headlamps. The circuit is also equipped with two internal diagnostic resistors.
When the switch is turned all the way to the right (lights off), the switch contacts are open and only the two internal diagnostic resistors (1.8 kohm each)
are connected between each connection and ground. If the switch is turned one setting to the left, (parking lights) pin 2 is grounded. With an additional
turn to the left (headlamps) pin 1 is grounded.
The light switch also has LEDs to light the symbols and knob.
Connection
