Apparently there isn't one. My horns had frozen diaphragms, and beating them up with a hammer solved the problem. Here is a more complete answer by RFXK (1017/06): I had this same problem and went crazy looking for a bad relay. Apparently there ISN'T a horn relay for the G-20. Probably you have one of two problems, frozen diaphragms in the horn units, or corroded contacts on their housings. For the diaphragms, take a regular hammer and give each horn a dozen firm taps - rattle them good and hard. Then try again. This is what worked for me this past weekend. For the contacts, take the connectors off (expect to lose a little skin doing it), and use a tiny wire brush to scrap the corrosion off the tab on the horn housing (both horns). One of those tiny mirrors on a flex stick helps you see what's going on - the tabs are brilliantly located in their most inaccessible orientation. Use a tiny screwdriver to scrap the metal contacts in the connectors a few times. Apply a TINY amount of dielectric grease to the tabs (it's not conductive, so don't get dumb about it) and put the connectors back on. If it isn't either of these, either no power is getting to the horn, or both horns are croaked. You can check the power situation by running a clip-on from the tab of either horn and touching the other end to the positive battery lead (make sure you're making good contact at both ends). If the horn beeps, then you probably have a broken wire or (less likely) the switches in the steering wheel are bad. If no beep, probably bad horns. Good luck!
hornrelay location for g20
The 1990 G20 Chevrolet Van fuel relay switch is located on the front of the fuel tank. The relay switch is next to the fuel pump.
no
Integrated into the starter.
P235-70r-15
35 p.S.i.
A blown fuse may be the reason a horn is not working in a Chevy van. It could also be caused by a faulty horn relay.
The 1999 Chevy Astro horn relay switch can be found on the back of the horn. The relay switch will be attached to the horn with two retaining screws.
35 p.S.i.
Yes.
What relay are you trying to replace? (what does it operate?) horn
You need to lower the fuel tank to get at it.