Infra Red Remote System (Yes, I searched!) - Mercedes-Benz Forum
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post #1 of 14 (permalink) Old 11-22-2018, 05:40 PM Thread Starter
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Infra Red Remote System (Yes, I searched!)

I have searched and read a good dozen posts on the IR remotes, but I can't seem to find an answer to my particular problem.

1997 Sl320

Single button infrared remote

I have two remotes that work well, but only at night. In the daytime, even in the carport, no joy. I can get them to work if I hold the remote nearly against the sensor with my hand around the remote to block all light. All three sensor points work in the dark, but not with the sun up.

Thoughts?

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post #2 of 14 (permalink) Old 11-22-2018, 07:14 PM
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Have you check the battery in the remote ? and clean the lens (of the remote and the receiver).
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post #3 of 14 (permalink) Old 11-22-2018, 07:26 PM Thread Starter
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Have you check the battery in the remote ? and clean the lens (of the remote and the receiver).
Both remotes have new batteries. I polished one of the receiver lenses, but it made no difference. The lenses on the remotes seem clear.

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post #4 of 14 (permalink) Old 11-22-2018, 08:00 PM
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in my case I had similar symptoms even with brand new remote batteries but ONLY with the trunk IR sensor. sensor was on it's way out and replacing the sensor solved the problem.

In your case, not working on all 3 sensors, wouldn't immediately have me believe sensors are the issue. and since it is with both remotes, doesn't sound like remotes. Not sure what that leaves for possibilities.


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--------His------------Hers-------

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/Parchment Leather/Black Top


Chromed OEM wheels, Akebono's, H1+90 fog, Burlwood/Leather shift knob, Rostra Lumbar support, Check seat heaters, Bilstein's, Parrot Bluetooth, GG Bailey Custom cargo mat, GG Bailey trunk mat, Real Burlwood Instrument Cluster w Chrome rings, Burlwood & Chrome shift surround, Euro headlights with Osram 70W/65W H-4's, clear corners, Silverstar corner lamps, Euro Trunk mount Warning triangle, SL600 Burlwood armrest trim & Burlwood cupholder sliding cover, Kahtec flashing third brake light (CHMSL)


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post #5 of 14 (permalink) Old 11-23-2018, 12:10 AM
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I guess with the 97 the sensor is rather underneath the inner rearview mirror than in the doors or trunk, perhaps it needs some cleaning.
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post #6 of 14 (permalink) Old 11-23-2018, 03:54 AM Thread Starter
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I guess with the 97 the sensor is rather underneath the inner rearview mirror than in the doors or trunk, perhaps it needs some cleaning.
Mine are in the doors and trunk lid.

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post #7 of 14 (permalink) Old 11-23-2018, 04:03 AM Thread Starter
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in my case I had similar symptoms even with brand new remote batteries but ONLY with the trunk IR sensor. sensor was on it's way out and replacing the sensor solved the problem.

In your case, not working on all 3 sensors, wouldn't immediately have me believe sensors are the issue. and since it is with both remotes, doesn't sound like remotes. Not sure what that leaves for possibilities.
Well, you've answered one of my thoughts/questions, anyway. I was thinking perhaps the sensors were somehow daisy-chained and thus a single bad one might affect all the others.

The next question was, could all three sensors be bad. The car did spend a fair amount of its life in Florida (and the Florida sun), but I wouldn't think the sensors would degrade from sun exposure, rather I figured they would "go bad" (i.e. not work or work intermittently).

So the only common part is the brain, yes?

Which then leads me to the next question: as the brain appears to be discontinued, I'll need to buy one used (I see several on Ebay, so that's not a problem), do I need to match my part number exactly, or are they all interchangeable?

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post #8 of 14 (permalink) Old 11-23-2018, 08:32 AM
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Originally Posted by R129FE View Post
I guess with the 97 the sensor is rather underneath the inner rearview mirror than in the doors or trunk, perhaps it needs some cleaning.
97 doesn't have a mirror sensor, just sensors in each door and trunk.


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/Parchment Leather/Black Top


Chromed OEM wheels, Akebono's, H1+90 fog, Burlwood/Leather shift knob, Rostra Lumbar support, Check seat heaters, Bilstein's, Parrot Bluetooth, GG Bailey Custom cargo mat, GG Bailey trunk mat, Real Burlwood Instrument Cluster w Chrome rings, Burlwood & Chrome shift surround, Euro headlights with Osram 70W/65W H-4's, clear corners, Silverstar corner lamps, Euro Trunk mount Warning triangle, SL600 Burlwood armrest trim & Burlwood cupholder sliding cover, Kahtec flashing third brake light (CHMSL)


97 E420 Royal Indigo/Grey Leather

Raintracker wiper, Rostra Lumbar support, Parrott Bluetooth, 17" chrome AMG replica wheels, Bilstein's, Akebono's, smoked marker lights, Osram 65W H7's, H1+90 fog, Rear Seat Child restraint Tether, Burlwood/Leather shift knob, OEM Mudflaps, DRL's, Becker Aux input
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post #9 of 14 (permalink) Old 11-25-2018, 06:33 AM Thread Starter
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Well, since it's the thing that's common to all three sensors, I ordered a used module. We'll see if it works...

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post #10 of 14 (permalink) Old 11-25-2018, 04:33 PM
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I had same problem with a '92 500SL. Read all the posts. Tried most things people recommended, including replacing fuses. No luck. I ended up solving the problem completely by accident while trying to sort out another problem.

Engine had an intermittent hesitation at high revs. Narrowed it down to MAS module. I did a blanket solder on the MAS module pcb, and... this is the relevant bit - at same time I unplugged every module in the engine bay and cleaned the contacts with electrical spray cleaner. While I was at it, I did same with the modules in the trunk. I also replaced the OVP.

[Edit - I also recall that I cleaned the earth straps to]

Hesitation was fixed, but to my surprise so too was the infra-red central locking. This was 2 years ago, and infra-red still works like new. Full daylight 5m away.

My best guess is that the problem with old infra-red locking systems is due to a build up of electrical resistance in the wiring/circuit over time, which could explain why cleaning the contacts and changing the OVP worked.

My best guess is that any change in the current to the IR sensors (by a few hundred milliamps) affects the sensitivity of the IR sensors to different wavelengths of light. The build up of resistance reduces the current in the IR circuit, which changes the sensivity of the IR sensors so that they no longer see the IR, or they have a reduced sensitivity to IR light.
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Last edited by robm.UK; 11-25-2018 at 11:57 PM.
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