The horn contact located in the left combination switch is constantly supplied with electric current via the red wire in contact 3 of the combination switch directly from the "plus" of the storage battery. Therefore, the horn should work even with the ignition off when you press the horn switch contact. If the horn does not work, you can check it.
1. Disconnect the wire ends.
2. Remove the siren.
3. Connect a wire to each connector and connect it to the plus and minus of the battery, respectively.
4. If there is no sound, then the siren is faulty.
5. A wheezing or silent siren can sometimes be turned on by turning the adjustment bolt on the back of the siren.
6. Clean the screw from the sealing compound.
7. After adjustment, cover the screw with body putty or silicone or rubber compound to prevent moisture from getting in.
Note: Recommendation: additional horn sirens need a relay. Otherwise, the contacts of the standard horn will be overloaded and will not be able to sound at full volume. Buy a set of signals with a relay (you can also buy them from Renault). You will immediately receive an installation manual with an electrical diagram.
Troubleshooting
Malfunction | Its reason | Troubleshooting |
| A. The horn siren does not sound. | 1. The wiring to the siren is faulty (white wire). 2. The siren is faulty. 3. The wire in the siren contacts is faulty. | Check the wire along its entire length, clean the contacts in the siren connectors. Check and replace if necessary. Check the entire length of the wire. |
| B. The horn sounds continuously. | 1. The wire from the siren contact to the siren has a short circuit to ground. 2. Internal short circuit in the siren. | Disconnect the gray wire. If the siren is silent, check the entire length of the wire. Do not insert the wire while continuing the trip. Replace the siren. When continuing your journey, disconnect the white live wire and, if necessary, insulate it. |