Where are the horn and headlamp relays for a 1997 chevy blazer? My headlights/highbeams will not turn on.

The relay closest to the driver's side is the fuel pump relay. The middle relay is the horn relay. All three relays are exactly the same. So, you can switch two of them to see if they both work or not.

You might have a shorted headlight relay or a shorted wire for the headlights.

try checking the fuse first highbeam and dipped use different fuses.

Just to make sure, You do know that the 97 Blazer has daytime running lamps. Right? They will come on when you start it.

there should be another fuse / relay box under the hood - the headlamps will probably have a fuse and a relay. if the fuse is ok - try swapping the headlamp relay with another in the box - if all is ok start looking at the headlamp and or highbeam switches

first thing to check is the headlight relay under the hood. the easiest way to check is to swap it with a non-essential relay of the same type, like the horn or a/c. if the headlights still don't work check for proper power and ground in the relay socket.

have you tryed replacing light bulbs if so check relays

sould chane the headlights

Buy 1 bulb and insert in each socket one at a time. If the low beam does not work on either side you know it is not because of the bulb. Then you will have 1 extra bulb for emergencies. Ask at autoparts about a headlight relay for lowbeam. When you wrote that highbeams work on pullback you did not say if they stay on high. You have "Flash to Pass" for highbeam which can be a different circuit. The automatic headlight switch is yet another set of contacts to go bad. You should set "auto" to off so you are not fighting this feature when testing. Good Luck

check the headlight relays under the hood also fuses under the hood and in the interior fuse pannel.