Horn wont work...1999 cutlass

easiest is chevy pumps hum and relays click so turn key on and listen should hear click and then a slight hum when pressuring up --no click can mean relay bad or over heated but tech way is remove relay and test with a meter or use another [same number relay]matching relay and turn key and if starts relay bad no start check the pump for power possible bad harness wire or connection or pump bad

take a multimeter and check if your getting power to the relay and from it (when its supposed to be on). if no power to relay its the switch that activates relay or the wiring, if no power from relay when its supposed to be working, bad relay.

Relays fail quite often and are easy to replace, while the button seldom fails and is much harder to repair. Start with fuses and relay.

Many of the relays in a car are exactly the same. Look for a similar one and swap the two, that will tell you if its good or bad.

as with all elect. fails check all fuses
in this case the 15 amp fuse marked, HORN
can i presume all else works good> car drives.?
all answers, USA spec car. nobody ever tells location, so..... if not USA< all answers wrong. the usa car has just 1 horn.....
got voltage to horn? 12v
Yes or no.?
if yes horn bad.
got voltage from horn relay
yes, bad wires.from, relay to horn
no, got voltage 12v to horn relay coil,
yes, good, no bad fuse.
got 0v to other relay coil (all tests honking)
yes, bad relay.
no, bad horns switch.

if you want me to guess. sure.
1: bad wires ../connections, end to end.
2 bad horn
3: bad relay
4: bad horn switch.

Any relay can be tested to some degree, but to be certain, just buy an inexpensive relay and try it in there,
The Automatic Shut Down relay is just one of many relays on your car. It takes battery power from the battery, and when activated by the computer, will pass that power on to the fuel injectors and to the ignition coil, some applications also it will work on the fuel pump. If the ASD relay is bad, no injector pulse, no power to coil, etc.-car won't start. When key is turned to off, the relay is not active-I think that may be why it's called auto shutdown relay.

there is a relay under the hood in the fuse/relay panel called drl, or daytime running lamps, that relay is most likely bad, a good way to tell is switch it with the high beam relay, if they come on you know thats it, if they dont, its the relay for the lowbeams, again switch it with the high beam relay and see.. either way i can tell you for sure one of those two are bad... but most of the time it is the daytime running lamps, or sometimes called driving lights relay. hope this helps you

what i normally do to check if a fuse relay is bad is check the power going to the relay itself. if you have power in the right places then the relay is probably bad. or if you look at the other relays, their are normally ones that are the same as the one you pulled out. so you can switch them and see if the problem continues

It could be the fuse, climate control, switch, or relay.
If you check at the switch, that will also tell you if the fuse might be bad.
Then if you check at the relay, that will tell you if the climate control is bad.

FUSE AND RELAYS LOCATED UNDER THE HOOD IN THE ENGINE COMPARTMENT.TO LOCATE RELAY LOOK IN GLOVE BOX FOR OWNERS MANUAL IT WILL TELL YOU TELL WHERE THE COOLING FAN RELAY IS SINCE THERE ARE MANY OF THEM.