Active headlights

[steve788]

Hi. I've done a quick trawl of the forum but can't find a thread which deals with such a basic question. I've had my D5 SE LUX for about 5 years and had to replace a headlamp bulb and so I replaced both and suddenly I had the active bending headlights system working (which I wasn't even aware of before). Great, I thought. Then it stopped working again. The button has the little green light showing so the systems should in theory be "on", but the headlights point dead ahead as they did before mysteriously springing into action. Does anyone have any thoughts on how I might have kicked them into and out of action? Thanks! (Secondary question: having now read the manual, doesn't the system also enable changing the beams to a European drive-on-right orientation? This doesn't seem to work either.) Any ideas or pointers most welcome. Cheers

[Tannaton]

Make sure the headlight switch is in position II for full dipped headlights. Some owners don't do this as the headlights are on in Pos 0 as the DRL's but, depending on the software versions on the car, the ABL system is inop when the switch is at POS 0.

[steve788]

Originally Posted by Tannaton

Make sure the headlight switch is in position II for full dipped headlights. Some owners don't do this as the headlights are on in Pos 0 as the DRL's but, depending on the software versions on the car, the ABL system is inop when the switch is at POS 0.

Thanks, yes, have tried that, no joy!

[steve788]

Originally Posted by steve788

Hi. I've done a quick trawl of the forum but can't find a thread which deals with such a basic question. I've had my D5 SE LUX for about 5 years and had to replace a headlamp bulb and so I replaced both and suddenly I had the active bending headlights system working (which I wasn't even aware of before). Great, I thought. Then it stopped working again. The button has the little green light showing so the systems should in theory be "on", but the headlights point dead ahead as they did before mysteriously springing into action. Does anyone have any thoughts on how I might have kicked them into and out of action? Thanks! (Secondary question: having now read the manual, doesn't the system also enable changing the beams to a European drive-on-right orientation? This doesn't seem to work either.) Any ideas or pointers most welcome. Cheers

I was also wondering if there's anything else obvious. Presumably there's a mechanism which controls the direction of the headlights? Is there a point of failure which would cause neither side to work and failure of which wouldn't give a dashboard warning?

[SwissXC90]

Originally Posted by steve788

Is there a point of failure which would cause neither side to work and failure of which wouldn't give a dashboard warning?

Not really
It works from the steering Angle Sensor, but that feeds many systems.

The Headlamp control Module also has diagnostics which alert the vehicle if failures are present