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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Cosmetic and Lighting Modifications (exterior & interior) > How does an LED bulb have anything to do with Canbus?
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      03-18-2017, 09:39 PM   #1
valley_nomad
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How does an LED bulb have anything to do with Canbus?

I have seen "Canbus error free", "Canbus decoder", "Canbus adapter" and other Canbus-related terms that are associated with various LED bulbs. But I have not been able to understand how exactly an LED bulb works with the Canbus which is a networking platform among various electronics modules in the car for digital communication. It seems that neither an LED bulb nor its so-called Canbus decoder/controller/adapter is connected with the Canbus, let alone communicating with other modules via Canbus. Can any one shed some light?

Last edited by valley_nomad; 03-18-2017 at 10:04 PM.
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      03-18-2017, 10:41 PM   #2
Billfitz
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Canbus monitors the car systems. If it checks a lamp circuit for the resistance normally presented by a halogen bulb it won't find it with an LED, because LEDs don't present the same resistance that halogens do.
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      03-21-2017, 04:45 AM   #3
valley_nomad
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Thanks. But my understanding is that Canbus is just a bus or network connection. It provides only the service for communication among modules and doesn't have any functionality, such as monitoring lamp circuit. In my car it is FEM that controls the front lights, and it very likely monitors them as well... Is Canbus just a marketing term when it comes to aftermarket LED?
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      03-21-2017, 10:02 AM   #4
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Smile

You are correct. The term "Canbus" has just become the overarching term when addressing these issues. As they say" it is just the bearer of bad news".
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