Short in horn circuit

Hello,

If you've recently replaced your indicator switch and light switch with a second-hand one and now your horn is sounding continuously when you connect the battery, there could be a few potential reasons for this issue:

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.

Here are a few steps you can take to troubleshoot and address the issue:

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.

It's important to address electrical issues promptly to avoid potential damage to your vehicle's electrical system and ensure safe operation.

Could have DTC"S
B1217 Horn Relay Coil Circuit Failure SJB REFER to Section 413-06 . B1218 Horn Relay Coil Circuit Short to Battery SJB REFER to Section 413-06 .
If the relay had a problem a DTC would be set .
PINPOINT TEST B: THE HORN IS ALWAYS ON Test Step Result / Action to Take B1 CHECK THE HORN SWITCH

• Remove the driver air bag. Refer to Section 501-20B .
• Does the horn continue to sound?

Yes
GO to B2 .

No
INSTALL a new driver air bag. REFER to Section 501-20B . TEST the system for normal operation. B2 CHECK THE HORN SWITCH HARNESS FOR A SHORT TO GROUND

• Key in OFF position.
• Disconnect: Horn Switch Harness.
• Key in ON position.
• Does the horn continue to sound?

Yes
GO to B3 .

No
REPAIR or INSTALL a new horn switch harness as necessary. INSTALL the driver air bag. REFER to Section 501-20B . TEST the system for normal operation. B3 CHECK THE CLOCKSPRING

• Key in OFF position.
• Disconnect: Clockspring C218a.
• Key in ON position.
• Does the horn continue to sound?

Yes
GO to B4 .

No
INSTALL a new clockspring. REFER to Section 501-20B . TEST the system for normal operation. B4 CHECK CIRCUIT 6 (YE/LG) FOR A SHORT TO GROUND

• Key in OFF position.
• Disconnect: Smart Junction Box (SJB) C2280a.
• Key in ON position.
• Does the horn continue to sound?

Yes
GO to B5 .

No
REPAIR the circuit. TEST the system for normal operation. B5 CHECK CIRCUIT 1 (DB) FOR A SHORT TO VOLTAGE

• Key in OFF position.
• Install the driver air bag. Refer to Section 501-20B .
• Disconnect: SJB C2280b.
• Key in ON position.
• Does the horn continue to sound?

Yes
REPAIR the circuit. TEST the system for normal operation.

No
GO to B6 . B6 CHECK FOR CORRECT SJB OPERATION

• Disconnect all the SJB connectors.
• Check for:
  • corrosion
  • pushed-out pins
• Connect all the SJB connectors and make sure they seat correctly.
• Operate the system and verify the concern is still present.
• Is the concern still present?

Yes
INSTALL a new SJB. REFER to Section 419-10 . CLEAR the DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.

Could be a wiring problem or the clockspring in the steering column.
You would need to pull the steering wheel and test the circuits.

Sounds like a short circuit make sure your using proper fuses and what not.

Sounds like s dead short in the horn circuit.

horns only one of to wires takem reroute same route new wires u have a short between the fuse box n the horn befor u put to much money into fuses they can be pricey when u add them all up shop costs n total just re place ur to horn wires

If the horn doesn't sound, check the horn fuse in the power distribution center located in the engine compartment. If the fuse is blown, replace it and retest. If it blows again, there is short circuit in the horn, or wiring between horn and fuse block.

Horn is located under vehicle on the front side of the vehicle between fender and front bumper.

your horn maybe have a short circuit on it.
replace the horn and this problem must resolved. horn is alocated rear grille, and before radiator.

you may need to put a relay in it as the current from the horn may be back feeding up the immobiliser horn circuit and causing a short. Sounds like the immobiiliser has its own source of power seperate from the factory circuit When you press the horn the power goes to the horn and up the immobiliser horn circuit and it blows the fuse.

you must check the contact switch on the steer wheel.