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Remote functions of key fob stopped working

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Old Sep 19, 2006 | 03:01 PM
  #1  
Frank Wiesmann's Avatar
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Remote functions of key fob stopped working

One of my keys has stopped working. It still starts the car, but the remote lock, unlock and trunk pop features no longer work. Funnily enough, it is not the key I have been using every day for the past 3,5 years, but rather the "spare". Any idea of what this might be? Do I need new batteries?
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Old Sep 19, 2006 | 03:19 PM
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From: Fl
92 500sel/01 320e wag
The SmartKey and remote unlock are two seperate items. The Lock /Unlock is powered by the batteries in the remote, while the ignition unlock is by inductive energy from the lock. If you push and hold a button you should see a flash on the remote below and to the left of the panc button.
If you need new batteris they can be acessed by removing the metal key and sliding over a gray latch inside the opening, the rear portion will slide out (circuit board) batteris are there!

Last edited by Peter Guenther; Sep 19, 2006 at 03:21 PM.
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Old Sep 19, 2006 | 03:23 PM
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'71 Pinto
There’s a battery check lamp on the key’s surface that will briefly light up red when pressing any button.
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Old Sep 13, 2007 | 12:34 PM
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'06 Porsche 997 Black Sport Exhaust, '06 Mercedes E350 4MATIC Iridium Silver Apper+Prem Package
Originally Posted by konigstiger
There’s a battery check lamp on the key’s surface that will briefly light up red when pressing any button.
I also have problem with one of my remote. I checked the battery check lamp and it lights up, but not always. Does this mean that the battery is running low or there is anything wrong with it?
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Old Sep 13, 2007 | 12:53 PM
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From: North Scottsdale, AZ
'71 Pinto
Originally Posted by Heejin
I also have problem with one of my remote. I checked the battery check lamp and it lights up, but not always. Does this mean that the battery is running low or there is anything wrong with it?
If the check lamp is not consistently lighting I recommend changing the battery.
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Old Sep 14, 2007 | 12:19 AM
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'06 Porsche 997 Black Sport Exhaust, '06 Mercedes E350 4MATIC Iridium Silver Apper+Prem Package
Originally Posted by konigstiger
If the check lamp is not consistently lighting I recommend changing the battery.
I am having this checked at the dealership tomorrow. I will keep you posted.
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Old Sep 16, 2007 | 02:21 AM
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My SA told me that he will replace the key since it didn't look like a battery problem.

I am wondering if I am getting the new style key
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Old Sep 16, 2007 | 09:09 PM
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2003 E500 Sport, 1995 SL320
i just had the same problem... none of the buttons seem to work on my remote... the red light doesnt even light up. i cant use the keyless go function either. i just put in 2 new batteries today, and no luck.

any ideas guys, or do i need to dish out for a new remote?
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Old Sep 16, 2007 | 10:33 PM
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From: South CA (LA, 818) & North CA (SJ, 408)
2003 E500
Originally Posted by E500 Benzo
i just had the same problem... none of the buttons seem to work on my remote... the red light doesnt even light up. i cant use the keyless go function either. i just put in 2 new batteries today, and no luck.

any ideas guys, or do i need to dish out for a new remote?
It sounds like your bettery is dead.
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Old Sep 16, 2007 | 11:24 PM
  #10  
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From: Seattle, WA
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Originally Posted by E500 Benzo
i just had the same problem... none of the buttons seem to work on my remote... the red light doesnt even light up. i cant use the keyless go function either. i just put in 2 new batteries today, and no luck.

any ideas guys, or do i need to dish out for a new remote?
If it doesn't work with new batteries, I guess you have the similar problem as me. If your vehicle is still under warranty, you should be able to get a new replacement key from your dealership for sure. However, you have '03 model, so it might not be the case.
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Old Oct 14, 2007 | 02:33 AM
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Smile

Originally Posted by Heejin
My SA told me that he will replace the key since it didn't look like a battery problem.

I am wondering if I am getting the new style key
I got the replacement key a couple of weeks ago. As expected, it's the new style one. Even though this looks quite fancy, I found it a bit heavy. In addition, I think it's very slippery, too.

Oh well, my wife likes it. I guess it doesn't really matter whether I like it or not
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Old Oct 14, 2007 | 01:53 PM
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From: DVStyle
2006 Mercedes Benz E350
Originally Posted by Heejin
I got the replacement key a couple of weeks ago. As expected, it's the new style one. Even though this looks quite fancy, I found it a bit heavy. In addition, I think it's very slippery, too.

Oh well, my wife likes it. I guess it doesn't really matter whether I like it or not
At least they didn't charge you for it!
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