2009 2.4l. Does it have a wiring issue? - Pontiac Cars & Trucks

1. Wiring Issue: Double-check the wiring connections for the indicator switch and light switch. Ensure that all wires are correctly connected to their respective terminals. A loose or incorrect connection could be causing a short circuit, which might trigger the horn.
2. Faulty Switch: The second-hand switch you obtained might be faulty or damaged. It's possible that there's an internal issue within the switch itself, causing it to send a constant signal to the horn.
3. Short Circuit: It's possible that during the installation process, a wire got pinched or damaged, creating a short circuit. This could lead to continuous power being supplied to the horn circuit.
4. Grounding Issue: Check the grounding of the switches and the horn. Poor grounding can lead to erratic behavior in electrical systems.
5. Compatibility: Ensure that the second-hand switch is compatible with your vehicle's make and model. Different vehicles might have variations in wiring and electrical systems.

1. Disconnect Battery: Disconnect the battery to stop the continuous horn sound and prevent any further electrical issues.
2. Inspect Wiring: Carefully inspect the wiring connections for any signs of damage, loose connections, or incorrect connections. Make sure that each wire is connected to the correct terminal on the switches.
3. Check Switch Functionality: Test the second-hand switch separately before connecting it to your vehicle. Verify that it functions correctly and doesn't cause any issues when operated.
4. Test Horn Circuit: Test the horn circuit by disconnecting the wires from the horn itself. If the horn stops sounding, then the issue is likely related to the wiring or the switch. If the horn continues to sound, the problem might be in the horn relay or elsewhere in the electrical system.
5. Professional Help: If you're unable to identify and resolve the issue, consider seeking assistance from a professional mechanic or an automotive electrician. They have the expertise to diagnose and fix electrical problems effectively.

First off check to see if you are getting power to the motor, if so, the issue is with the motor If you're not getting power then it's a wiring issue & you will either have to trace your wires back through to see in there is a break or corrosion issue, or replace the wires.
It will probably be easier to run new wires.