What is a CK/SRCK socket?

A CK/SRCK is like the traditional sockets you see in most Japanese, and American vehicles except the ground terminals are located on the same side of the socket.  If the ground terminals are located on the opposite side of the socket, then it more then likely is a standard socket.  We still encourage you to test the sockets using a multimeter.  To identify the ground positions.

Standard Socket

What will happen if a standard LED bulb is used for a CK socket?

Only one level of brightness(intensity) will light up, and when the other application is activated, it will cause a short on the circuit.

How to distinguish between a  CK socket and a standard socket?

From our experiences, most TOYOTA vehicles front turn signal sockets are a CK type.  Sometimes, you can even see there are two terminals connected directly, which means they are the ground terminals.  You may also identify the ground terminal location from the wires on the back of the socket.  A test is still required, using a multimeter, in order to confirm the type. Also your original bulb will tell you if it is a CK or standard, most CK bulbs will say SRCK on the bulb base.

Why do I have a standard halogen bulb, but a CK socket?

The ground pins of halogen bulbs are not shared. The ground pins of LED bulbs are connected on the circuit board inside the LED bulb. The circuit board is necessary to help maintain the temperature of LED which will provide stability, and a long lifespan.