Eickecc

There is this slight, annoying buzz coming from the front dome LT area. Haven't had a chance to look into it yet....just wondering if anyone has insight. Thanks!

jctevere

Try placing pressure on the securing clip for the sun-visor. Mine buzzes and rattles occasionally. Perhaps this is your noise, if not, it could be some other issue...

Eickecc

I'll def try that, but it is more like the sound voltage makes....not quite speaker-feedback, but an arching of voltage...???

Glyn M Ruck

There is an aircon sniffer fan in the 203/209 etc. dome. I think the 204 would be the same. Might be that??

Eickecc

Yeah....I feel like an idiot. Never knew it was there...not sure what it does. Ha


But, I took a look at it last night and found that there was a bunch of fuzz in it.....blew it out and it is much quieter. Though, it is still pretty annoying. Is that a noise all owners must get used to? Surely it is silent on someone's car, right?

Glyn M Ruck

The sniffer fan should be dead silent! The sniffer fan is trying to ensure that the humidity & temp sensors get a representitive sample of in-car air.

Eickecc

I see....I'll likely take another look to see how much I can accomplish with it. Any ideas as to cleaning/repairing/replacing?

Glyn M Ruck

If you have blown any visible dirt out of the unit removed. Then the only option is a new one. I have little doubt that Benz will only sell the whole module - never know - you might get lucky but I doubt it. My EPC shows it as one unit - Item 10. You are going to have to go to the dealer with your VIN to ensure you get the correct part.



10 A 204 820 20 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT [903]
Code: -414
001
10 A 204 820 21 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT
Replaced_By: A 204 820 85 01 [903]
Code: -414+882
001
10 A 204 820 85 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT [672], [903]
Code: -414+882
001
10 A 204 820 22 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT [903]
Code: -414+359
001
10 A 204 820 31 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT [903]
Code: 413
001
10 A 204 820 32 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT
Replaced_By: A 204 820 86 01 [903]
Code: 413+882
001
10 A 204 820 86 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT [672], [903]
Code: 413+882
001
10 A 204 820 33 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT [903]
Code: 359+413
001
10 A 204 820 76 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT
Replaced_By: A 204 820 81 01 [672], [903]
Code: 414
001
10 A 204 820 81 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT [672], [903]
Code: 414
001
10 A 204 820 77 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT
Replaced_By: A 204 820 82 01 [672], [903]
Code: 414+882
001
10 A 204 820 82 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT [672], [903]
Code: 414+882
001
10 A 204 820 78 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT
Replaced_By: A 204 820 83 01 [672], [903]
Code: 359+414
001
10 A 204 820 83 01 INTERIOR LIGHT
ROOF MOUNTED OPERATING UNIT [672], [903]
Code: 359+414
001
20 A 204 820 69 61 .LIGHTING UNIT
IN OVERHEAD CONTROL PANEL
12V-5W Code: -414
002
20 A 204 820 69 61 .LIGHTING UNIT
IN OVERHEAD CONTROL PANEL
12V-5W Code: 414
002
40 A 220 820 03 35 MICROPHONE
SOUND SYSTEM Code: 810
001
60 A 221 820 04 01 INTERIOR LIGHT
IN HEADLINER 002
70 A 221 825 03 82 .LAMP SOCKET
WITH BULB 002
80 N 000000 0000853 ..BULB
12V-5W 002
160 A 221 820 04 01 INTERIOR LIGHT
TO INSTRUMENT PANEL BOTTOM Code: 954/955
002
170 A 221 825 03 82 .LAMP SOCKET
WITH BULB Code: 954/955
002
180 N 000000 0000853 ..BULB
12V-5W Code: 954/955
002
210 A 204 820 79 01 INDICATOR LAMP
LEFT FRONT DOOR [904]
Code: 954/955
001
210 A 204 820 79 01 INDICATOR LAMP
RIGHT FRONT DOOR [904]
Code: 954/955
001
210 A 204 820 79 01 INDICATOR LAMP
LEFT REAR DOOR [904]
Code: 954/955
001
210 A 204 820 79 01 INDICATOR LAMP
RIGHT REAR DOOR [904]
Code: 954/955
001
220 A 221 825 03 82 .LAMP SOCKET
LEFT FRONT DOOR Code: 954/955
001
220 A 221 825 03 82 .LAMP SOCKET
LEFT REAR DOOR Code: 954/955
001
220 A 221 825 03 82 .LAMP SOCKET
LEFT REAR DOOR Code: 954/955
001
220 A 221 825 03 82 .LAMP SOCKET
RIGHT REAR DOOR Code: 954/955
001
230 N 000000 0000853 ..BULB
LEFT FRONT DOOR
12V-5W Code: 954/955
001
230 N 000000 0000853 ..BULB
LEFT REAR DOOR
12V-5W Code: 954/955
001
230 N 000000 0000853 ..BULB
LEFT REAR DOOR
12V-5W Code: 954/955
001
230 N 000000 0000853 ..BULB
RIGHT REAR DOOR
12V-5W Code: 954/955
001
260 A 204 820 48 01 INTERIOR LIGHT
REAR DOME LAMP Code: 953
001
260 A 204 820 49 01 INTERIOR LIGHT
REAR DOME LAMP [905]
Code: 954/955
001
260 A 204 820 49 01 INTERIOR LIGHT
REAR DOME LAMP [905]
Code: 950+953/950+954/950+955/952+953/952+954/952+955
001
270 N 072601 1012120 .BULB
REAR DOME LAMP
12V-10W Code: 954/955/950/952
001
280 A 204 820 69 61 .LIGHTING UNIT
REAR DOME LAMP
12V-5W Code: 954/955/950/952
002
280 A 221 825 03 82 .LAMP SOCKET
REAR DOME LAMP Code: 953
001
285 N 000000 0000853 ..BULB
REAR DOME LAMP
12V-5W Code: 954/955/950/952
002
285 N 400809 9000004 ..BULB
REAR DOME LAMP
12V-6W XENON Code: 953
001
310 A 221 820 04 01 INTERIOR LIGHT
IN RIGHT PANELING 001
320 A 221 825 03 82 .LAMP SOCKET
WITH BULB 001
330 N 000000 0000853 ..BULB
LUGGAGE COMPARTMENT LIGHTING
12V-5W 001
350 A 221 820 21 01 INTERIOR LIGHT
REAR LID 001
360 A 221 825 03 82 .LAMP SOCKET
WITH BULB 001
370 N 000000 0000853 ..BULB
REAR LID
12V-5W 001
900 A 037 545 59 28 PIN BUSHING HOUSING
ENTRANCE/EXIT LAMP
2 PIN;E17/3; E17/5 001
901 A 016 545 41 26 CONTACT SPRING
0.25-0.5 MM2 MQS NB
904 A 037 545 59 28 PIN BUSHING HOUSING
LUGGAGE COMPARTMENT LAMP
2 PIN;E18/4 001
905 A 016 545 41 26 CONTACT SPRING
0.25-0.5 MM2 MQS NB
908 A 052 545 67 26 SOCKET HOUSING
ROOF MOUNTED OPERATING UNIT
10-PIN;N70 001
909 A 013 545 15 26 CONTACT SPRING
0.75-1.0 MM2 SLK NB
909 A 013 545 16 26 CONTACT SPRING
1.5-2.5 MM2 SLK NB
909 A 016 545 41 26 CONTACT SPRING
0.25-0.5 MM2 MQS NB

Eickecc

Right, that part looks costly...I'm not quite that annoyed just yet. I'll prob look to see if the blades on the fan all have the same pitch. Maybe one of them has been torque inadvertently and can be adjusted. Thanks for all the help Glyn!

Glyn M Ruck

A pleasure. Yes - if you are good with the hands you might well achieve a simple fix. The usual cause of noise from small fans in computer cooling etc is the tips of the blades going through the sound barrier if poorly designed or running too fast. This is a slow speed fan.

DonjuanOriginal

Thank You I was wondering what the hell that sound was. Lol

Glyn M Ruck

German attention to detail for their aircon sensing!