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Premium Member
2016 E350 wagon; **1994 E320 wagon SOLD**
Joined
8,138 Posts
Discussion Starter · #1 ·
the new-to-me 1993 300CE (Cabriolet) dome lights don't seem to shut off if you put them in automatic mode. I've yet to investigate farther, but I wonder if anyone else has dealt with these, and repaired them? it appears the timer circuit is in the dome light assembly, and the assembly is a $500 part (OUCH), so I'd rather repair it than replace it. I replaced the one on my volvo 740, was only about $100 for an updated style that was interchangable with my older style.

now, I'm not above rewiring it to be timer-free if I can't fix it properly (and as an electronics geek, I'm pretty good with that stuff)...
 

Premium Member
2016 E350 wagon; **1994 E320 wagon SOLD**
Joined
8,138 Posts
Discussion Starter · #2 ·
ok, more testing has shown...

if they are in automatic, when you start the engine, they go off.

but, if you open and close a door, they never go off.

that tells me the timer circuit is fried.

maybe I can rewire so there is no timer, door closed, lights off.
 

Premium Member
'92 300TE 4matic 280,000miles, '92 300TE 4Matic 'Ice Blue Metalic' 101,000miles
Joined
11,486 Posts
A cab might be different, but in the wagons, sedans and coupes the seat belt warning light, all door convenience light functions and reading light are controlled by the overhead unit...along with a sensor for the sampler fan. If you take the unit apart, it has several IC's in there. Best is to find another in a JY and sub. They are crazy expensive new, OE.

For example, my puddle lights in the front doors work, but the overhead light for the front doors do not. Yet the back interior lights work in the wagon as they are supposed to. Both overheard lights will work if you switch to them manually. Bad overhead convenience module.

Kevin
 

Premium Member
2016 E350 wagon; **1994 E320 wagon SOLD**
Joined
8,138 Posts
Discussion Starter · #4 ·
the cab has a completely different one than the sedan/wagon, it has a reading light on each side, and no 'main' light, with two 3-way rocker switches. left switch is 'door/automatic mode', 'off', and 'both on', while the right switch is left light, off, right light. I don't know if this is the same as the coupe.

my door puddle lights work fine. if I switch it to auto mode, and open the door, the lights come on, but they never go off after closing the door. they do go off if I start the car.
 

Premium Member
'92 300TE 4matic 280,000miles, '92 300TE 4Matic 'Ice Blue Metalic' 101,000miles
Joined
11,486 Posts
Even though its a cab, you're gonna have a small convenience module somewhere controlling the light cycle. Does the cab have a sampler motor?

Kevin
 

Premium Member
2016 E350 wagon; **1994 E320 wagon SOLD**
Joined
8,138 Posts
Discussion Starter · #6 ·
near as I can tell, the dome assembly light on the cabrio has the timer function AND the climate control sampler motor integrated.


The cabriolet dome light assembly is module E15 here, 24823200.pdf

E15m1 and E15b1 are the sampler motor and temp sensor afaik.
 
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