An car stereo will have its own screen display and backlighting around the buttons to make navigation easier during dark conditions. Without the lights not working on your car stereo, you can press the wrong buttons and it also makes it hard to operate while driving at the same time. If your car stereo doesn't power on at all, then the first thing you need to check is the fuse if it was working fine before.
Sometimes, an unknown short circuit can occur resulting in no power to the car stereo. There is an dedicated fuse box somewhere within the vehicle. You will often find the radio fuse labelled as an number in the user handbook under the fuse section. The best method to check if an car stereo fuse is blown is to remove it and inspect it physically, hold the fuse and check if the wire in the middle is broken apart. If yes, the fuse is blown resulting in no power to your car stereo. This is because the fuse has broken the circuit, replace the blown fuse with an brand new one with the correct rating. Also, there will be an additional fuse found on the back of the car stereo directly, check this also.
If the radio is powering on perfectly, music is playing through the car speakers, but the lights are not working on the car stereo or no backlight, then the orange limitation wire may not be connected. This is an separate wire that controls the lighting for the car stereo, this wire should ideally be connected to the ignition switched source on the back of the radio. On android and most aftermarket radios the orange and the red wire would be twisted together and connected to the ignition live wire.
If your car stereo lights are still not working, if your radio has an removable fascia panel that pops off, please remove it. Behind the front radio panel, you will see several gold metal pins that make contact with the front of the car stereo. When the panel is attached, these metal gold pins from both sides make contact, if there is dirt or dust it can cause an bad connection. Get an lint free cotton button and some cleaning alcohol solution and wipe down the metal contact on the radio itself and the panel. Re attach the panel and retest your car stereo.
If you still can't get your car stereo lights to work, then there will be an technical issue with the radio itself. This can be due to being an old radio, daily wear that has caused it.
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