COULD NOT miss about CAN Bus for led automotive bulb, before replacing your halogen bulb or hid bulbs to led bulbs.

1. Copyright ©2018 BROS International Co., Limited
www.BROSled.com Tel:+86-20-28177560 Email: led@BROSled.com
Room 705, Taifeng Building, No. 38 Dongsheng North Street, Wanggang, Baiyun District, Guangzhou, 510440, China
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CAN Bus means Controller Area Network Bus. This system monitors your vehicle and reports operating conditions. CAN
Bus systems are commonly found in many European vehicles and some American vehicles. While most late model
American vehicles have CAN Bus systems, it is always good to check with your vehicle dealer to see which system your
vehicle has before purchasing electrical products.
What are CAN Bus Error Free LED bulbs?
CAN Bus Error Free LED bulbs are LED bulbs that have resistors that are internally/externally attached. European and some
American vehicles, such as Audi, Mercedes-Benz, BMW, Porsche, Range Rover, Jaguar, Dodge, Chrysler, Mitsubishi, Jeep,
Volkswagen, Volvo, are the typical candidates for these types of LED bulbs as the electrical system on these cars have
sensors that detect whether the light is working or not. Any questions, welcome to communicate with BROSintl. Since LED
bulbs draw far less power than the original halogen or HID bulbs, the vehicle’s computer may think that the bulb is out so
it'll throw an "error message" or "bulb out" warning the driver that the light is out; thus the name "error free". The
resistor’s job is to mimic the power draw of the original halogen or HID bulbs to trick the computer to think that the bulbs
are drawing the same rate of power so the vehicle does not throw any error messages.
Error free LED bulbs are most commonly used for exterior lights such as the turn signals, head lights, parking lights, license
plate lights and more. Interior lights typically do not need error free bulbs, but for certain vehicles, it is required.
Can I use CAN Bus LED bulbs in non-CAN Bus applications?
CAN Bus LED bulbs SHOULD NOT be used in non-CAN Bus applications because in most cases they can cause other vehicle
circuits to have problems. A CAN Bus LED bulb presents more resistance than the original bulb due to built-in resistors and
may cause feedback into other circuits in the non-CAN Bus electrical system.
How do I know if my car is equipped with CAN Bus?
If the vehicle warns you when a bulb is out, it is equipped with CAN Bus. The easiest way is to contact the vehicle’s supplier
or dealership,or contact BROSintl expert. If you’re still not sure, we normally tell customers to remove a light and drive the
vehicle to see if it gives a warning. For example, remove a rear parking light – one that is not a brake light or turn signal
also and drive the vehicle around during the day with the parking lights on. If the vehicle gives the bulb out warning, it is

2. Copyright ©2018 BROS International Co., Limited
www.BROSled.com Tel:+86-20-28177560 Email: led@BROSled.com
Room 705, Taifeng Building, No. 38 Dongsheng North Street, Wanggang, Baiyun District, Guangzhou, 510440, China
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CAN Bus. If no warning, no CAN Bus.
I have Error Free LED bulbs, but they still throw an error, why?
With vehicles that require error free LED bulbs, there is a specific way to install the lights to make sure that there is no
error message. Please follow the steps below:
1. Take out the LED bulb and replace it with the original bulb, turn on the vehicle, and confirm if the error message is
cleared.
2. Turn off the vehicle and re-install the LED bulbs (make sure it is the correct side of polarity or else the vehicle will record
the error message again). If the LED bulb is installed, but the polarity is incorrect, you will have to start the troubleshoot
again from step one (1).
3. Close all the doors, lock the vehicle, and wait 10-15 seconds. After this period, start up the car and turn on the lights to
check for the error message.
This is a strange procedure to do, but what we have found in the past is that it does work out well for majority of the
vehicles we’ve dealt with. If the troubleshoot above still does not work, please contact BROSintl and we’ll find an
alternative solution to the problem.
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