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Changed the blub, fuse good but still donot work?

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I have an 04 Cayenne Turbo. One of the headlight bulb's color turned into yellow vs bright white (some call blue) and than it went off totally.

I took it to my mechanic, he changed both bulb with brand new xenon ones (so that they match) but the problem headlight still wouldn't work.

He than chacked all fuses and changed the bulbs again thinking replacement bulb maynot be good. But still nothing...

He says there is a module between the fuse and the bulb, and module might be causing the problem.

Anyone had a problem like this or do you know what might be the solution and cost?


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I think you have HID headlight bulbs in your vehcile. Did you replace the associated supporting ballasts (called the Ballast Control Module) along with the bulbs? If a HID bulb totally fails it can take the ballast with it and you'll need to replace them as well.

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I checked the socket no corrosion.

I have xenon bulbs. I changed only the bulbs but not the Module! But the thing is as far as I know that module controls lot of other things too. In my case only the xenon causes a problem. Parking lights, signals lights, high beams work. Turning lights were also working but now stopped when I took it off and played with it while changing the bulb. Even wipers stopped working than they came back now. I dunno, its little weird.

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Ok - that says more.

How old is your battery? If it is 4 years old or older replace it. These cars are very sensitive to weak batteries.

You might also need to get the front end control (box) re-programmed - sometimes they "get lost" and need re-programming - again most likely due to a weak battery.

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  • 2 weeks later...

Clear the codes in the front light control module. Also have a proper charger on the battery system when testing-low battery voltage even after only a few minutes with key on/engine off will cause false fault code and strange electrical operation.

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