Understanding Indicator Lights - IQ Controller (2nd gen)

Using VEX IQ (1st generation)? See this article.

Notice there are two different indicator lights on the VEX IQ (2nd generation) Controller.

Power LED

The first indicator light is called the Power LED.

Image of the VEX IQ Controller, showcasing its buttons and layout, used for programming and controlling VEX IQ robots in educational settings.

There are three possible colors of the Power LED to indicate the status of the VEX IQ Controller Battery and of the VEX IQ Radio Link:

Power LED Color   Controller Status Controller Battery Status

Image of the VEX IQ Controller, showcasing its buttons and layout, used for programming and controlling VEX IQ robots in educational settings.

Solid Green Controller ON - NOT paired with a Brain Controller Battery level sufficient

Image of the VEX IQ Controller, showcasing its buttons, joystick, and display screen, designed for programming and controlling VEX IQ robots in educational settings and robotics competitions.

Blinking Green Controller ON - Paired with a Brain Controller Battery level sufficient

Diagram illustrating the VEX IQ Controller, highlighting its buttons, joystick, and display features, designed for educational robotics use and programming with VEXcode IQ.

Solid Yellow Actively Pairing  

VEX IQ Controller image showcasing its layout, buttons, and features, designed for educational robotics, highlighting its role in programming and controlling VEX IQ robots for beginners and enthusiasts.

Solid Red Controller ON Controller Battery level low

Image of the VEX IQ Controller, showcasing its buttons and layout, used for programming and operating VEX IQ robots in educational settings.

Blinking Red Controller ON - Paired with a Brain Controller Battery level low

Image of the VEX IQ Controller, showcasing its buttons and layout, used for programming and operating VEX IQ robots in educational settings.

Fast Red Blinking Firmware on your controller is failing to load. View this article. N/A

If the Controller is not wirelessly connected to a VEX IQ Brain, see this article for more information about wirelessly pairing a VEX IQ (2nd generation) Controller and Brain.


Charge LED

The second is called the Charge LED. This LED will only illuminate when the Controller is plugged into a charger. 

Diagram of the VEX IQ Controller, illustrating its buttons, joystick, and LED indicators, used for programming and controlling VEX IQ robots in educational settings.

There are three possible colors for the Charge LED: green, red, and gray.

Charge LED Color   Status

Image of the VEX IQ Controller, showcasing its buttons and layout, used for programming and controlling VEX IQ robots in educational settings.

Solid Green Controller Battery is completely charged

VEX IQ Controller image showcasing its layout, buttons, and features, designed for educational robotics, highlighting its role in programming and controlling VEX IQ robots for beginners and enthusiasts.

Solid Red Controller Battery charge in progress

Image showing the VEX IQ Controller, highlighting its buttons and features, used for programming and controlling VEX IQ robots in educational settings and robotics competitions.

Blinking Red Controller Battery fault

Image of the VEX IQ Controller, showcasing its buttons and layout, used for programming and controlling VEX IQ robots in educational settings and robotics competitions.

Off Not charging

See this article for information on how to charge a VEX IQ (2nd generation) Controller.

For more information, help, and tips, check out the many resources at VEX Professional Development Plus

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