Hi Everyone - hope you're having a great day (or night).
I just picked up a 2007 3.0 S-Type to keep my 2005 XKR company. The new baby drove delightfully on the trip home, but I noticed that the door armrest mirror/windows switch panel became quite warm. Everything still worked okay but I doubt the panel should be other than normal temperature, especially on a cloudy/showery day. I'm taking it back to the dealer where I bought it for them to check it out, but any tips/thoughts on what might be causing it would be most welcome. Many thanks - all the very best, Graham.

 

Yes. Replace the bulbs.

Here is the Jaguar TSB describing the problem.
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Many thanks tbird6 - I'd never have thought of those little bulbs.
Your advice greatly appreciated. All the best, Graham.

 

Very interesting. I just lived with the hot buttons when headlamp was on. I didn't observe illumination issue with the buttons so I assume all my bulbs in the switch module are on. So what will replacing the bulbs fix? Just curious.

 

The heat they produce. Pretty warm in the summer. The replacement lamps are cooler.

 

I was surprised when I saw it too. Just never thought changing bulbs would work because they all produce heat.
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Thanks again everyone for your comments and help. Am I missing something though?! Why should the switch panel for the windows and mirrors get hot if the headlamps are on? Why would any of the current flow for the headlamps be channelling through a switch panel that has nothing to do with them? This does explain it though as I had the headlamps on when the panel got hot, and subsequently driving with the lamps off the panel stayed cool. Very interesting! Even if it doesn't seem to make sense! Thanks once more, have a super day and an even better weekend. Cheers, Graham.

 

Graham, if I understood others' explanation the new bulb is higher efficiency light bulbs thus they produce less heat for similar light output. And the bulbs are turned on only when headlamp circuit is also energized.

Just musing; there has to be LED equivalent that can substitute..,

 

The LED probably has a million lumens at 1 degree temp. lol

 

Thanks TonyX! I understand the 'hot bulbs' causing the heat, but I still don't get why turning on the headlamps sends current to bulbs in the windows/mirrors switch panel. Can anyone explain that for me please?

 

Sure... when you turn on the lights, your window button lights come on so you can see them in the dark just like your instrument lights. It is more efficient to have everything come on at the same time verses several switches and circuits for each area of your car.

 

Many thanks David - of course! I haven't driven the car at night yet so the obvious answer didn't occur to me. One more brain and it'd be lonely! Greatly appreciate your reply to my query. All the very best, Graham.