Automatic driving lights control

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The following preconditions must be satisfied before the driving light can be activated automatically:

Light switch in "AUTO Position"
"Terminal 15 on"
Rain-light-solar-condensation sensor reports low brightness

The LIN bus provides the link between the rain-light-solar-condensation sensor and the Junction Box Electronics (JBE) module. The junction box electronics (JBE) requests the status of the ambient brightness from the rain-light-solar-condensation sensor via the LIN bus. The rain-light-solar-condensation sensor relays this information to the Junction Box Electronics (JBE) module. The Junction Box Electronics (JBE) module transmits the status via K CAN2. The footwell module (FRM) receives the status of ambient brightness and analyses it. The footwell module (FRM) carries out any prompt received to switch the driving lights on or off. The automatic driving lights control switches on the driving light together with the side lights.

Should no signal be received from the rain-light-solar-condensation sensor owing to a defect while the automatic driving lights control is activated, the footwell module will respond by switching on the headlamps.

Once the headlamps have been switched on by the automatic driving lights control, they can be switched off again with the light switch or by the rain-light-solar-condensation sensor, provided that ambient lighting of adequate brightness is present. Even after "Terminal 15 off" the side lights can remain on because they were activated by the automatic driving lights control system. The side lights are switched off automatically when the driver's door is opened. When the occupants exit the vehicle from another door, the side lights are switched off when the vehicle's locks are engaged.

The footwell module (FRM) will only switch on the driving lights when there is low ambient brightness. There may thus be a delayed activation of the driving light when the vehicle enters a tunnel or a tree-shaded lane. The light switch must be in its "AUTO Position".