2002 C Class Smart key
Thread Starter
Newbie
Joined: Sep 2012
Posts: 6
Likes: 0
From: Melbourne, Australia
2002 C class Sedan
2002 C Class Smart key
I have a 2002 C class sedan that I bought privately. One of the keys does not work and to replace, MB are asking for $700 Aus Dollars.
The faulty key seems to do everything correct, when I press any button the red led blinks. The infra red also works, when i look thru a digital camera, i can see the light flashes. Yet i cannot open the car or start the car.
Any ideas if this key can be repaired?
Thanks Heaps.
Gino
The faulty key seems to do everything correct, when I press any button the red led blinks. The infra red also works, when i look thru a digital camera, i can see the light flashes. Yet i cannot open the car or start the car.
Any ideas if this key can be repaired?
Thanks Heaps.
Gino
MBWorld Fanatic!
Joined: Jan 2004
Posts: 5,939
Likes: 178
From: Seattle WA
99 E320
try polishing the IR lens
check the battery voltage, static as well as under load (report back)
the bad key does not belong to your car - previous owner purchased it off ebay (wild guess)
check the battery voltage, static as well as under load (report back)
the bad key does not belong to your car - previous owner purchased it off ebay (wild guess)
Thread Starter
Newbie
Joined: Sep 2012
Posts: 6
Likes: 0
From: Melbourne, Australia
2002 C class Sedan
Thank raymond for the quick response.
I will try and polish the IR lens.
It has passed thru my mind that it might not be the correct key, the metal key itself does open the car. The writing on the inside of the battery compartment : 315MHZ and the FCC ID, and the CAN numbers are identical. Is this the same on all keys?
thanks
gino
I will try and polish the IR lens.
It has passed thru my mind that it might not be the correct key, the metal key itself does open the car. The writing on the inside of the battery compartment : 315MHZ and the FCC ID, and the CAN numbers are identical. Is this the same on all keys?
thanks
gino
MBWorld Fanatic!
Joined: Jan 2004
Posts: 5,939
Likes: 178
From: Seattle WA
99 E320
dont know . i know north american keys use different frequency than other countries.
another trick...but not possible for yours at this stage is to insert key into
ignition and turn to position 1 and let it sit for a bit while the interlock circuitry
interrogates the key. polish lens first.
unlocking car doors uses RF
open/close windows and roof uses IR
ignition uses passive induction and I think IR, too
http://edsoto.com/e320/w210/electrical.htm
(oops, that's for 210 but it's very possible your 203 of that year will be very similar. will try to check)
p.s. yeah it seems to be set up very similar to 210s *see attachment*
another trick...but not possible for yours at this stage is to insert key into
ignition and turn to position 1 and let it sit for a bit while the interlock circuitry
interrogates the key. polish lens first.
unlocking car doors uses RF
open/close windows and roof uses IR
ignition uses passive induction and I think IR, too
http://edsoto.com/e320/w210/electrical.htm
(oops, that's for 210 but it's very possible your 203 of that year will be very similar. will try to check)
p.s. yeah it seems to be set up very similar to 210s *see attachment*
Last edited by raymond g-; Sep 11, 2012 at 12:04 AM.
MBWorld Fanatic!
Joined: Jan 2004
Posts: 5,939
Likes: 178
From: Seattle WA
99 E320
selling something but it's not cost effective. all those smartkeys being sold
on Ebay are ripoffs. zero reprogramability.
I was able to get my chrome Smartkey for $60 US but that disappeared quickly
when MB USA found out about this loophole. now, it's about $2-300 US.
no, we can't help you because with MBUSA policy, must have car registration
and driver's license, blah blah...
