Question about 1997 Chevrolet Astro

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I need to tie into the horn wiring with a horn pushbutton to replace the one buried in the steering column. Where do I find a schematic with wire colors etc that I can use. I bought a general maintenance book, but it has every thing except the horn circuit.

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  • jerrya269 Aug 04, 2010

    I'll let you know when I get home and try it ! But it sounds good.Thank you



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  • Chevrolet Master
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If u go to the bottom of the steering column connector the trigger wire for the horn is Black, you ground this wire to honk the horn

Posted on Aug 04, 2010

  • jerrya269 Aug 04, 2010

    I have a problem with your solution, if as you say the black wire is "hot" and you ground it to sound the horn, then the power flow must be from the battery to the horn thru the horn to the black wire thru the horn switch to ground. This means that there should be a hot (12Volts) wire at the horn always and there isn't. The above scenario assumes no horn relay. Doing what you said to do would only blow the horn fuse. My horn is working now, so what you told me to do got me to thinking and several presses on the steering column horn icon started the horn to sound. (Corroded contacts I assume) I am not asking for a refund as your suggestion did get me to make a few checks, but I do believe that what you ask me to do would not have helped. As I have not seen a schematic I can only comment on what I observed and measured with a voltmeter.
    Thank you and have a good day. The State Inspector will now pass my used- to- not- work- horn.



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A fuse always blows for a reason. The reason your fuse must have blown was because of a short to ground in the horn switch. That means the power side of the horn switch is currently touching ground or metal or that the switch is bad on the inside. The more remote possiblity is that you have a short somewhere in the wiring harness. It is always typical for a component to go bad before a harness.

Here are some notes directly from chrysler, let me know if you need any clarification:


  1. Disconnect and isolate the battery negative cable. Remove the lower steering column cover/knee blocker. Check for continuity between the metal steering column jacket and a good ground. There should be continuity If OK, go to Step 2. If not OK, refer to Steering and Suspension/Steering Column and check for proper installation of the steering column mounting nuts.
  2. Remove the driver's airbag module. Unplug the horn switch wire connector. Remove the horn relay from the Power Distribution Center (PDC) . Check for continuity between the steering column half of the horn switch feed wire connector and a good ground. There should be no continuity If OK, go to Step 3. If not OK, repair the short circuit as required.
  3. Check for continuity between the steering column half of the horn switch feed wire connector and the horn relay control circuit cavity for the horn relay in the PDC. There should be continuity If OK, go to Step 4. If not OK, repair the open circuit as required.
  4. Check for continuity between the horn switch feed wire and the horn switch ground wire on the airbag module. There should be no continuity If OK, go to Step 5. If not OK, replace the faulty horn switch.
  5. Depress the center of the airbag module cover and check for continuity between the horn switch feed wire and the horn switch ground wire on the airbag module. There should be continuity If not OK, replace the faulty horn switch.

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