Key fob issue
Thread Starter
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Joined: Oct 2009
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C320
Key fob issue
I'm having trouble with the key fobs on my wife's 2001 C320. I've searched all the forums but none of the hits match the same problem we're having.
The RF mode never works, and the IR mode works as long as it's not raining. When it's dry out, the IR mode works just fine. I checked fuse 8 and it's not blown. We've tried resyncing and the shop has also. Still have the problem.
Anyone have any ideas? The only other problem with the car is that the rear window sunshade doesn't know when to stop and has to be turned off manually. I don't know how that could be related, but you never know... .
The RF mode never works, and the IR mode works as long as it's not raining. When it's dry out, the IR mode works just fine. I checked fuse 8 and it's not blown. We've tried resyncing and the shop has also. Still have the problem.
Anyone have any ideas? The only other problem with the car is that the rear window sunshade doesn't know when to stop and has to be turned off manually. I don't know how that could be related, but you never know... .
MBWorld Fanatic!
Joined: May 2009
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From: Toronto, NYC
2002 Mercedes Benz C230 Coupe
What is the exact problem?
When you say the RF mode never works, do you notice something like "the car wont unlock when you're far away"? What physical problem do you see?
When you say the RF mode never works, do you notice something like "the car wont unlock when you're far away"? What physical problem do you see?
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Joined: Mar 2007
Posts: 5,295
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From: VA
THE C350
search for the rear aerial i know i have seen post just like yours on here before.
you owe me https://mbworld.org/forums/c-class-w...cks-issue.html
what does re syncing mean? i have never heard of a way to re sync a new Mercedes key? hope the shop didn't charge you.
i assume you have tried new batteries as well + spare key?
as for the raining part that is wired did you try both sensors?
Have you installed tint?
you owe me https://mbworld.org/forums/c-class-w...cks-issue.html
what does re syncing mean? i have never heard of a way to re sync a new Mercedes key? hope the shop didn't charge you.
i assume you have tried new batteries as well + spare key?
as for the raining part that is wired did you try both sensors?
Have you installed tint?
Last edited by samaritrey; Oct 24, 2009 at 01:58 AM.
Thread Starter
Newbie
Joined: Oct 2009
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C320
I mean the RF mode doesn't work _ever_. No matter how far away. I can hold the fob right against the antenna in the window and it won't unlock the doors.
Resynched is probably the wrong term. The dealer reset the car and re-added the fobs, like when it's made. That seemed to work until the car left the lot and then stopped again.
I'll check out the RF amp. If it's bad, that could explain why it seems random. If I can get the RF mode working, the IR mode doesn't matter as much.
And there's no tint on the car. Batteries in the fobs are new. Both fobs have the issue.
Resynched is probably the wrong term. The dealer reset the car and re-added the fobs, like when it's made. That seemed to work until the car left the lot and then stopped again.
I'll check out the RF amp. If it's bad, that could explain why it seems random. If I can get the RF mode working, the IR mode doesn't matter as much.
And there's no tint on the car. Batteries in the fobs are new. Both fobs have the issue.
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Joined: Mar 2007
Posts: 5,295
Likes: 22
From: VA
THE C350
i would say your antenna is out. but to be sure you really need to get it to a dealer or a good Indy with the star das.
1. Your car could be forgetting the keys (aunts car did this)
2. Antenna out (many people with tint)
3. both key fobs are dead (they get abused)
do both ir sensors have problems in the rain or just one? (one early w203 they had a sensor in both front doors)
i have also read that when the rf amp goes out radio stations get worse how are yours?
gl keep us posted
1. Your car could be forgetting the keys (aunts car did this)
2. Antenna out (many people with tint)
3. both key fobs are dead (they get abused)
do both ir sensors have problems in the rain or just one? (one early w203 they had a sensor in both front doors)
i have also read that when the rf amp goes out radio stations get worse how are yours?
gl keep us posted
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MBWorld Fanatic!
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2006 C350 Sport 6MT
You wanna hear a trippy story. When I drive my car hard and abuse it (make insane turns) sometimes the door unlocks itself. Then when I come and park and I press lock it doesn't work for a while.
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Super Moderator
Joined: Mar 2007
Posts: 5,295
Likes: 22
From: VA
THE C350
wtf you guys must drive extremely hard i drive really hard and have never had the door looks do that. i have heard that if you drive hard and you have something in your trunk it can do that. now when i drove my aunts clk i had the bars fly up once which scared the **** out of me 
same with an sl i took for a spin 
thank god my dads slk55 has the fixed bars because those things flying up could scare someone into wrecking.
same with an sl i took for a spin thank god my dads slk55 has the fixed bars because those things flying up could scare someone into wrecking.
