Check for power at the horn with a volt meter. If you don't have one a 12v light will work too. If there is power there replace the horn, if not you will have to check the wiring back to see where the problem is.
Hope that helps
Brian
Testimonial: "Thanks Brain, very helpful!"
Check for power at the horn plug. Check for a good ground at the horn. Otherwise the problem could be the relay (even if it clicks) or the wiring to the horn from the relay.
http://www.youtube.com/profile?user=realfixesrealfast#p/search/0/C8t25GjZ6i4
SOURCE: can some post the 1999 gmc sierra wiring diagram
you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.
SOURCE: 2001 GMC Jimmy horn not working
get assistant to hold horn on then squirt some oil behind the front piece and tap with a small hammer ,i think it will work then with a bit of gentle persausion
1,235 views
Usually answered in minutes!
×