So does my SL500. The systems were IR until 98, I think, when they changed to 
RF.

Again, if the emitter is weak or the receivers are not working well, or their 
plastic lenses are cloudy, it won’t work from a distance of any kind, or in the 
sunlight.

-D


> On Aug 9, 2019, at 6:47 PM, Floyd Thursby via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> This one has an IR emitter you aim at these sensors on the door and trunk 
> lock area, each of those has the red/green indicators to show un/locking.  It 
> is a 600!  So it has to be more complicated!
> 
> -_FT
> 
> On 8/9/19 4:15 PM, Dan Penoff via Mercedes wrote:
>> The key has an RFC chip in it, the battery shouldn’t have any effect on it’s 
>> ability to start. Same reason why a “Mickey Mouse” key will start and run 
>> the car as well.
>> 
>> Just for grins, try the remote at each door and the trunk in the dark. I say 
>> that because my 1997 SL500 fob won’t work in the daylight, but will in the 
>> dark. I can only assume that something has weakened the fob (this is with 
>> brand new batteries) or the system isn’t as sensitive as it used to be.
>> 
>> -D
>> 
>> 
>>> On Aug 9, 2019, at 4:11 PM, Floyd Thursby via Mercedes 
>>> <mercedes@okiebenz.com> wrote:
>>> 
>>> Last week I thought I had locked the SL with the IR remote that shines at 
>>> receivers on the doors and trunk.  They have red and green lights that 
>>> blink red when it locks, green when it unlocks. I have noticed that the 
>>> lights don't all work, a green on one, a red on another, I think neither on 
>>> the trunk, and sometimes the key remote won't activate different lock 
>>> receivers.  Maybe the batteries are getting low in the remotes, I'll have 
>>> to check them.  These fobs have a key that flips out of a rectangular 
>>> housing when you push a little button, then a larger button to work the 
>>> remote signal.
>>> 
>>> So I went to get in the car, hit the remote button aimed at the driver 
>>> door, then got in.  Tried to start the car, no go.  Ugh. Finally got out 
>>> and fiddled with the battery cables, tightened them, whatever.  Then it 
>>> started OK.  Same thing happened Wed evening, fooled with the battery, 
>>> still no go.  I know the battery is good so it was confusing.  So for some 
>>> reason I tried the remote again at the driver door, which was open, and 
>>> then tried to start the car and bingo it worked.  So I am trying to figure 
>>> out if the door receiver is funky, or the key, or what.  i guess first 
>>> thing is to change key battery.
>>> 
>>> I guess this must be some immobilizer feature, ignition is disabled if the 
>>> locks are locked, although the driver door did not seem to be locking which 
>>> is why I could open it even though the car thought it was locked.
>>> 
>>> This thing gives me fits!
>>> 
>>> -- 
>>> --FT
>>> 
>>> 
>>> _______________________________________
>>> http://www.okiebenz.com
>>> 
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>>> 
>> 
>> _______________________________________
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>> 
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>> 
> -- 
> --FT
> 
> 
> _______________________________________
> http://www.okiebenz.com
> 
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> 
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> 


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