How It Works

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The switch is fed a supply voltage of 5 volts.

If the power supply is faulty, the dipped headlights will always remain on at all times when terminal 15 is ON. The dipped headlights will be switched on as soon as terminal 15 is switched on.

The dipped headlights are automatically switched on if the wiring to and from the light switch develops the following faults:

Open Circuit
Short Circuit To Earth
Short Circuit To Positive

For reasons of safety, the light switch can only be switched off if a voltage of 5 volts is applied to the two switch outputs to the light module (footwell module on the E90).

The dipped headlights cannot be switched off in the event of a short circuit causing a voltage of 5 volts at one of the switch outputs and 12 volts at the other. Dipped headlights and automatic driving lights control and adaptive headlights remain on until terminal 15 is switched off.