Passenger Wing Mirror - No Memory and a Mind of its Own

W221copea

Active Member
Joined
Dec 21, 2018
Messages
81
Location
Tyne And wear
Car
2009 W221 S320 LWB ; 2005 XC90 D5
Here's a new one I have not read about before.

Set the passenger wing mirror and store in memory seats. (not reverse lowering)
Use car.
Stop car.
Get out
Get in
Start car
Mirror moves 100% inward (glass not actual mirror assembly) and also points 100% up!!

Reset position, store in memory - back to square one......

I am baffled! Checked electrics, disconnected, reconnected. Forced the glass to a different position......start car and boom, Im looking for overtaking aircraft once again......

Any ideas?
 

Diesel Benz

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Feb 3, 2006
Messages
4,505
Location
Europe
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223.168 & 213.012 & 906.633
Sounds like an issue with the mirror position potentiometers, ground (or plus) wire making both vertical and horizontal adjustments fail. Did you check potentiometer readings at different mirror positions, preferably from the door control unit connector.
 

bolidemichael

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Apr 19, 2018
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1,089
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SW20
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S211 E500
I have had this issue before on my W211. It was only resolved when the entire unit was replaced with a new one (at an unexpectedly high price).

This doesn't assist you directly, but now you're aware of more than one instance of this issue having occurred, albeit on another model.
 

Diesel Benz

MB Enthusiast
Joined
Feb 3, 2006
Messages
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Location
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223.168 & 213.012 & 906.633
I have had this issue before on my W211. It was only resolved when the entire unit was replaced with a new one (at an unexpectedly high price).

This doesn't assist you directly, but now you're aware of more than one instance of this issue having occurred, albeit on another model.

Which entire unit was replaced? The mirror assembly (or internal parts only), the door control unit or the switch panel or everything?
 
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OP
W221copea

W221copea

Active Member
Joined
Dec 21, 2018
Messages
81
Location
Tyne And wear
Car
2009 W221 S320 LWB ; 2005 XC90 D5
Cars booked into Indy next week for something else and he will have a look and see what can- if anything - be done.

I fear another massive bill heading my way.
 
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W221copea

W221copea

Active Member
Joined
Dec 21, 2018
Messages
81
Location
Tyne And wear
Car
2009 W221 S320 LWB ; 2005 XC90 D5
So its knackered

STAR states the "potenti whatsit thingys" are allowing settings and movement to 255 in each direction, acceptable setting is 3!

Back to Ebay for a mirror to replace this one.
 

Clkdvrlloyd

New Member
Joined
Nov 13, 2020
Messages
15
Location
Hull
Car
CLK 220 CDI AVANT-GARDE 2007
My clk 220 cdi avant-garde has a mirrors problem in that some time's either the left or right mirror won't fold out and most times it's OK anybody have any ideas please
 

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