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Old 02-11-2015, 09:56 PM
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Join Date: Feb 2015
Posts: 2
Voltage at the tail lights.

Hey Guys,

Has anyone checked the voltage at the brake and tail light bulb sockets with the engine running, and would you please share that with me?

I am building some CAN Bus compatible LED Bulbs. Does anyone know the minimum resistance required for the brake and tail lights to satisfy the CAN Bus interface or what ever originates the blown bulb indicator?

I thank you all who help me make these LED Bulbs work.

Best Regards,

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Old 02-11-2015, 10:04 PM
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Join Date: Feb 2015
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Hey Guys,

Does anyone know specifically how the CAN Bus interface checks the tail light bulbs?

Has anyone tried 15 SMD LED brake light bulbs, and know whether they are CAN Bus error free as advertised?

Thank you,

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Old 02-12-2015, 08:38 AM   #3
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Location: Philadelphia area
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CAN Bus is a network protocol and is used to just send messages to various devices. The TIPM (totally integrated power module) does the detection by sensing the circuit's resistance. I think 6 ohms in parallel works but it needs to be high wattage.

Amazon.com: 50W 6Ohm LED Load Resistors for LED Turn Signal Lights or LED License Plate Lights (Fix Hyper Flash, Warning Cancellor): Automotive

Here is a good write up on CAN Bus:
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