The buttons don't seem to function

is there a diogram of where it runs to and from,my check engine light just came on 2 weeks ago and the code is po410

It is not working unless a jolt takes place due to a good bump or slam of the passenger door.Where is the resistor and or relay for my car?

Is there anyway to change the Xenon HID Lights without paying over $600 each for the Ignitor and Ballast?

I have a 2000 GMC Envoy, when i try to start it the engine tries to start but it won't catch. i checked the battery but the battery is good. what could be the problem?