OK Ladies, Gentlemen and Blazer Guru's I have a problem with my 97 4dr LT blowing the horn fuse.

Some background. I bought the Blazer back in December with 65K original miles and everything worked. About a month later I had to respond to an emergency call from my grandparents (my 93 y.o. grandfather fell and hit his head - he's OK). All the way through town I was blowing my horn and flashing my lights to get vehicles to move. Everything seemed to function till I returned home. That was on a Saturday night. On Monday when I went to get in to go to work, I noticed that the interior lights didn't come on and my horn no longer worked. I checked the fuses and sure enough the fuse was blown for the horn. I tried to replace the fuse and when I went to insert the new one it blew immediately. Suspecting a bad horn relay, I unplugged and removed the horn on the right side. I put in a new fuse and everything worked for about a day. I also found out that I had two horns (which according to my Haynes manual stopped being produced in 1996).

Now the horn, interior lights, power mirrors and rear glass hatch will not operate. I have disconnected the remaining horn, the power mirror switch and the interior light bulb and I still keep blowing the 20 Amp "horn" fuse immediately.

Can somebody give me a clue as to where to go from here? I can do with the interior lights (map lights still work) but the horn is a safety issue (new driver in the family).

Thanks in advance for all your help.

Joe

 

The horn relay is powered off of the CTSY fuse which also powers:

• Cargo Lamp
• Cigarette Lighter
• Console Courtesy Lamp, LF
• Console Courtesy Lamp, RF
• Dome Light
• Driver's Information Display Center
• Endgate Lock Switch
• Horn Relay (already mentioned)
• I/P Compartment Lamp
• Inside Rear View Mirror
• Interior Lamps Control module
• Liftgate Lock Switch
• Outside Remote Control Rear View Mirror Switch <--Check this out as I have seen them short out before and actually cause a small fire
• Remote Control Door lock receiver
• Sunshade Mirror Lamp, LH (if equiped)
• Sunshade Mirror Lamp, RH (if equiped)

 

Wow... this is a PITA. I've unplugged both horns, the mirror switch, the rear hatch release mechanism, the rear wiper, and still blow fuses the instant I put a new one in. I'd say it's time to set it on fire.

 

Wiring problems are rarely fun...

 

any luck finding out why the ctsy fuse keeps blowing, I have a 1997 Blazer and I am experiencing the same problem, no horn, rear hatch, dome light etc. wont work. I attempt to put new 20 amp fuse in and it pops before I even get it in, any ideas or solutions you might share.

much appreciated

Paul Anderson