Smart Car of America Forum banner
1 - 7 of 7 Posts

· Premium Member
1,660 Posts
The claim is that some cars monitor the lights and indicate on the dash if a light bulb is out. It does this by monitoring the current pulled by the lights and it knows when a light is out due to the light pulling no current. Since LED lights pull much less than then non LED bulbs, the sensor would see this as a light out. The Canbus error free lights have resistor in them that makes the sensor not report the light as out. I don't think Smart's have that sensor.

· Super Moderator
18,158 Posts
I’ll go for the direct answer :p

“Festoon” is the shape of the bulb. It’s basically a rectangular bulb/LED with a connector on each end.

“CANBUS Error Free” means that it has a little resistor in it so that it doesn’t trip your smart’s rapid turn signal flash.

So, if you’re replacing the license plate lights, you’re going to want a festoon CANBUS LED.

I recommend getting CANBUS in every LED. In my experience, even if the smart detects too little resistance in the license plate lights it’ll trigger the rapid flash.
  • Like
Reactions: TRobinson6
1 - 7 of 7 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.