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1998 SL500
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2 Posts
This is unfortunately common with c3's on older ones the relays go bad I have also seen bad cables.
The c3 got pretty cheap on aliexpress $150 or without cables.
You could get a new one and hope for the best.
If you want to to be on the save side get 's c4.

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I see. Well, there’s no seller on aliexpress who would happily recommend C4 for older vehicles ( before 2000).

Basically their answer is if I want a stable MUX for an old MB, then C3 is the way to go, if you wanna “try it” get the C4. So, now either I get a C3 with bad relays or C4 which can be unstable. Really confusing.
 

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Registered
2005 CLK320
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474 Posts
I see. Well, there’s no seller on aliexpress who would happily recommend C4 for older vehicles ( before 2000).

Basically their answer is if I want a stable MUX for an old MB, then C3 is the way to go, if you wanna “try it” get the C4. So, now either I get a C3 with bad relays or C4 which can be unstable. Really confusing.
The key is to get the correct software I use 2016.09 and a c4 works on every car.
I just sold my old c3 to sombody that did not need hht had exactly the same problem.

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