Dome light and Trunk light - Mercedes Benz SLK Forum

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#1 Old 12-11-2016
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Dome light and Trunk light

Replaced my K40 and have a new PSE pump.
Dome lights work properly when switched on manually and when I unlock or lock with key fob.
Dome light auto-dims correctly.

Dome light does not come on when either door is opened .
Trunk light does not come on when trunk is opened.
I doubt both door and trunk switches are bad.

Any ideas?
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#2 Old 12-11-2016
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did they work before?
check fuses?


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#3 Old 12-12-2016
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Originally Posted by jbanks15 View Post
did they work before?
check fuses?
As long as I've had the car there where issues with the door locks and lights.
That's why I replaced the PSE.
Now the key fob operates lights and locks as it should.

Checked all fuses and, as I said, the key fob unlock function operates interior dome and trunk as it should.
Manually clicking the switch on dome to "on" operates dome as it should.

Still though, neither door or trunk being "open" turns on dome or trunk light.
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#4 Old 12-12-2016
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the experts will jump in and might say, the door control module not fully doing its job or a switch misbehaving

we don't have a 1999 manual (do you?)but the 2000 manual says

https://www.mbusa.com/vcm/MB/Digital...230_slk320.pdf

page 110 the notes also mention trunk light


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#5 Old 12-12-2016
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Is the PSE the correct one for your VIN ?

If you've replaced with the same model you had before, maybe a previous owner had used one that wasn't right one, hence always having problems...?


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#6 Old 12-12-2016
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Is your roof operating normally?

For the trunk light, there should always be +12V on one side of the bulb - can you confirm it's there? That should narrow down the culprit.
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