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The relay block is inside the car, passenger side on kick panel up by the glove box. Horn relay will be the square block in a row of 6, closest to the firewall.
in the car
There are 3 fuse/relay boxes in the engine compartment. (Standing in front of car facing the engine), there is one on the passenger-side to the rear of the engine compartment there is also one to the right mid-way back on driver's side. But the one that you need resides up front slighty off to the right just behind the radiator. This houses the horn relay.
the horn does not have a relay on your car, does have a fuse inside the car, d.s dash
The horn relay is located in the fuse box under the hood of the 2007 Chevy Tahoe. The horn relay is responsible for making the car horn have sound.
On the steering wheel.
It is not advisable to install a car horn without a relay. The current draw of a horn is too much to run directly through the car and horn switch. Relays are used on items that have a high current draw for this reason. It is an unsafe practice to not use a relay in these conditions. You would not want to catch your car on fire.
A good way to fine the horn relay if you dont have a manual is to pull the wire on the horn then have somewon press the horn button .... beep beep beep you will hear a clicking sound which will help you locate the relay
your car horn is located inside your transmission
Take a 12v test light to the horn connection to see if there is power. Chances are the horn is bad( many were) you can get one at a salvage yard ($10). If there is no power it may be a bad horn relay; You can check with Autozone locator on line to find out location of the relay on your vehicle.I hope this helps you. Mark
Location depends if the car has factory alarm (OEM) or not. If the car came with no alarm, you'll have a high and low horn. The horns are behind the front bumper with high horn on the passenger side and low horn on the driver side. They are located behind where the fog lights would be (just below the turn signals). Remove the cover and you'll see it. If you have a factory alarm, you'll have a high horn and a underhood horn. High horn is in the same location as a non-alarmed car. Underhood horn is in the engine bay next to the fuse box on the driver side.
The easiest two ways are to either remove the fuse, or remove the relay. If the horn is stuck blowing then the relay is probably bad.