1. Introduction
This instruction manual provides comprehensive guidance for the safe and correct installation of the Connects2 CT20VX04 Harness Adapter. This adapter is designed to facilitate the installation of an aftermarket car stereo into specific Vauxhall vehicles, ensuring proper power, speaker, and antenna connections, including phantom power for the original Fakra antenna system.
2. Consignes de sécurité
- Débranchez toujours la borne négative de la batterie du véhicule avant de commencer toute installation électrique afin d'éviter les courts-circuits et les dommages électriques.
- Ensure all connections are secure and properly insulated to avoid electrical shorts.
- Si vous avez des doutes concernant une quelconque étape du processus d'installation, consultez un électricien automobile qualifié.
- Do not modify the harness adapter. Unauthorized modifications can lead to malfunction or damage.
- Conservez le produit à l’abri de l’humidité et des températures extrêmes.
3. Contenu du colis
Please verify that all components are present before proceeding with the installation:
- Connects2 CT20VX04 Harness Adapter (Main Unit)
- Fakra Antenna Adapter with Phantom Power Supply
- Vehicle-Specific ISO Connector

Figure 1 : The Connects2 CT20VX04 Harness Adapter. This image displays the primary wiring loom, including the vehicle-specific ISO connector for power and speakers, and the Fakra antenna adapter with its integrated phantom power supply.
4. Compatibilité
The Connects2 CT20VX04 Harness Adapter is compatible with the following Vauxhall vehicle models from 2004 onwards:
- Vauxhall Astra H (2004 onwards)
- Vauxhall Corsa C (2004 onwards)
- Vauxhall Vectra C (2004 onwards)
- Vauxhall Tigra (2004 onwards)
Note: Vehicle compatibility may vary based on specific trim levels or factory-fitted options. Always verify the existing wiring harness in your vehicle matches the adapter's connectors before installation.
5. Configuration et installation
Follow these steps carefully to install the harness adapter:
- Préparez le véhicule : Ensure the vehicle's ignition is off. Disconnect the negative terminal of the car battery to prevent electrical shorts during installation.
- Retirer l'autoradio existant : Carefully remove the factory-fitted car stereo from the dashboard. Refer to your vehicle's service manual for specific removal instructions.
- Connect Power/Speaker Harness: Locate the vehicle's factory wiring harness. Connect the vehicle-specific ISO connector from the CT20VX04 adapter to the corresponding connector in your vehicle. Ensure a firm and secure connection.
- Adaptateur de connexion d'antenne : Locate the vehicle's Fakra antenna connector. Connect the Fakra antenna adapter from the CT20VX04 to the vehicle's antenna cable. The adapter includes a phantom power supply, which is essential for active (amplified) factory antennas to function correctly with an aftermarket head unit.
- Connexion à un autoradio de rechange : Connect the ISO and DIN antenna connectors from the CT20VX04 adapter to the corresponding ports on your new aftermarket car stereo.
- Connexions de test : Before fully reassembling the dashboard, reconnect the vehicle's negative battery terminal. Turn on the ignition and test the new head unit's functionality, including power, audio output from all speakers, and radio reception.
- Sécuriser et réassembler : Once all functions are verified, disconnect the battery again. Secure all wiring to prevent rattles or damage. Carefully reinstall the aftermarket head unit and reassemble the dashboard components. Reconnect the battery.
6. Mode d'emploi
The Connects2 CT20VX04 Harness Adapter is a passive component designed to facilitate the connection of an aftermarket head unit. Once correctly installed, its operation is integrated with the functionality of your new car stereo. Refer to your aftermarket head unit's instruction manual for specific operating procedures.
7. Entretien
The CT20VX04 Harness Adapter requires minimal maintenance. Periodically, if you experience issues, you may:
- Vérifiez que toutes les connexions sont bien serrées et qu'elles ne présentent pas de corrosion.
- Ensure wiring is not pinched or damaged.
No user-serviceable parts are contained within the adapter. Do not attempt to open or repair the unit.
8. Dépannage
| Problème | Cause possible | Solution |
|---|---|---|
| No power to aftermarket head unit. |
|
|
| Aucun son des haut-parleurs. |
|
|
| Mauvaise ou pas de réception radio. |
|
|
9. Spécifications
| Numéro de modèle | CT20VX04 |
| Marque | Connecte2 |
| Compatibilité | Vauxhall Astra H, Corsa C, Vectra C, Tigra (2004 onwards) |
| Type de connecteur | Vehicle-specific ISO, Fakra Antenna, DIN Antenna |
| Matériel | Acrylonitrile butadiène styrène (ABS) |
| Poids de l'article | 3.88 once (110 grammes) |
| Dimensions du colis | 11.81 x 5.39 x 2.01 pouces |
10. Garantie et assistance
Connects2 products are designed for reliability and performance. For warranty information or technical support, please refer to the official Connects2 webConsultez notre site web ou contactez votre revendeur agréé. Conservez votre preuve d'achat pour toute réclamation au titre de la garantie.





