I believe its tied into the cig lighter, and radio, but at any rate whats going to let you know is by using a test light on the pins. If there is power going in then the clock is bad, there is infanate possibilities that can make something wrong and only one to make it right, but just because the lighter and radio work doesn't meen that a wire in the clock harness is broke or maybe one of the wires is pulled out of the plug, the only way is to pull the plug and check.