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Old 12-11-2008, 02:13 AM
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Join Date: Oct 2008
Posts: 5
Power Lock / Infrared Remote Problems

Searched the Tech Help, but couldn't find anything related.
Maybe someone has some suggestions for troubleshooting the following power lock and infrared remote problems which I'm experiencing with my 1990 300SL (R129):

- Driver and passenger side door locks cannot be operated with the key. The
key works fine with the trunk lock, though (locking/unlocking the whole car).

- Infrared remote works very unreliably (new batteries installed):
- remote does not work in the morning after car has been parked overnight
(driver, passenger door and trunk)
- after driving car for a while remote function typically comes back,
sometimes on driver side, sometimes on passenger side, sometimes on
both, but not on trunk. Remote function then works for a while (on doors), but will be
off again after car is parked and not used for a period of time.
- found out that remote function works reasonably fine when it's dark outside
- also found out that when remote does not work during the day it DOES work when
held directly to the infrared sensor in the door handle (only on driver side, though).

I don't know if the remote and key lock issues are related or have to be troubleshooted separately. Appears, that the issues with the remote have something to do with the IR sensitivity of the system ?

Any help highly appreciated.

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Old 12-11-2008, 08:01 AM
bobs's Avatar
Registered User
Join Date: May 2007
Location: Richmond, VA
Posts: 310
What are the condition of the plastic lenses on your remote & doors? If they are badly scratched/oxidized the range and effectiveness will be greatly reduced. A bit of 3M plastic polish made a big difference with mine.
"It's not about how fast you can go, but how well you can go fast."

Bob in Richmond

'97 S320 (LWB), Ruby Red Metallic, 73k miles
'97 S420V, Smoke Silver Metallic, 155k miles
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Old 12-11-2008, 12:23 PM
Registered User
Join Date: Oct 2008
Posts: 5
The lens on the remote looks pretty clear, but the lenses on the door handles and trunk lock are kind of matt - do they have to be shiny ?


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