1. Introduktion
The PAC OS-2X Radio Replacement Interface is designed to allow the installation of an aftermarket radio into select General Motors (GM) Class II vehicles while retaining essential factory features. This interface ensures the continued functionality of OnStar, warning chimes, and other vehicle-specific features that would otherwise be lost when replacing the factory radio.
This manual provides detailed instructions for the proper installation, operation, and maintenance of your PAC OS-2X interface. Please read all instructions thoroughly before beginning installation.

Figure 1: PAC OS-2X Radio Replacement Interface module and associated wiring harness. This image shows the main components included in the package, highlighting the interface module and the various connectors for vehicle and aftermarket radio integration.
2. Sikkerhedsoplysninger
- Frakobl altid bilens negative batteripol, inden du påbegynder elektrisk installation, for at forhindre kortslutninger og skader.
- Sørg for, at alle forbindelser er sikre og korrekt isolerede for at forhindre kortslutninger.
- Refer to your vehicle's service manual for specific wiring diagrams and disassembly instructions.
- Hvis du er usikker på nogen del af installationsprocessen, skal du kontakte en kvalificeret bilstereotekniker.
- Do not modify the interface module or wiring harness. Unauthorized modifications can void the warranty and cause damage.
- Keep the interface module away from moisture and extreme temperatures.
3. Pakkens indhold
Kontroller, at alle elementer er til stede, før du fortsætter installationen:
- PAC OS-2X Interface Module
- Vehicle Specific Wiring Harness
- Aftermarket Radio Connection Harness
- Brugervejledning (dette dokument)
4. Opsætning og forinstallation
- Læs manualen: Thoroughly read this instruction manual and your aftermarket radio's manual before starting.
- Saml værktøjer: Collect necessary tools such as wire strippers, crimpers, electrical tape, multimeter, and panel removal tools.
- Afbryd batteriet: Frakobl den negative pol på køretøjets batteri.
- Fjern fabriksradio: Carefully remove the factory radio from the dashboard. Refer to your vehicle's service manual for specific instructions.
- Identificér køretøjets ledningsføring: Familiarize yourself with the vehicle's factory wiring harness.
5. Installationsvejledning
Follow these steps carefully to install the PAC OS-2X interface:
- Connect Aftermarket Radio Harness: Connect the wires from the aftermarket radio's harness to the corresponding wires on the PAC Aftermarket Radio Connection Harness. Match wire colors and functions (e.g., constant 12V, accessory 12V, ground, speaker wires). Solder and heat shrink, or use high-quality crimp connectors for secure connections.
- Connect Vehicle Specific Harness: Plug the PAC Vehicle Specific Wiring Harness into the factory radio harness connectors in the vehicle's dashboard.
- Tilslut grænseflademodul: Plug the Aftermarket Radio Connection Harness and the Vehicle Specific Wiring Harness into the PAC OS-2X Interface Module. Ensure all connectors are fully seated.
- Connect Antenna Adapter (if required): If your aftermarket radio requires an antenna adapter, connect it now.
- Connect Steering Wheel Control (SWC) (if applicable): If your aftermarket radio supports steering wheel controls and you wish to retain them, connect the SWC output wire from the PAC module to the SWC input of your aftermarket radio. Refer to your radio's manual for specific SWC wiring.
- Test funktionalitet: Before reassembling the dashboard, temporarily reconnect the vehicle's negative battery terminal. Turn on the ignition and test the aftermarket radio's basic functions (power, sound, fader/balance). Verify that OnStar functionality and all warning chimes are working correctly.
- Sikre komponenter: Once all functions are verified, disconnect the battery again. Secure the PAC OS-2X module and all wiring harnesses behind the dashboard, ensuring they do not interfere with any moving parts or pinch points.
- Saml dashboardet igen: Reinstall the aftermarket radio and reassemble the dashboard components.
- Final Battery Connection: Tilslut den negative batteripol igen.
6. Betjening
The PAC OS-2X interface operates automatically once installed. Its primary function is to translate vehicle data signals for the aftermarket radio and maintain factory features.
6.1 OnStar Retention
The interface retains full OnStar functionality. When an OnStar call is initiated or received, the audio will be routed through the vehicle's speakers, and the aftermarket radio will mute or switch to the OnStar audio source, depending on the radio's capabilities.
6.2 Warning Chimes
All factory warning chimes (e.g., door ajar, seatbelt, key in ignition) are retained and will sound through the vehicle's speakers as they did with the factory radio.
6.3 Steering Wheel Controls (Optional)
If connected and configured, the interface allows the factory steering wheel audio controls to operate the aftermarket radio. Refer to your aftermarket radio's manual for programming instructions if necessary.
7. Vedligeholdelse
The PAC OS-2X interface is designed for maintenance-free operation. No user-serviceable parts are inside the module.
- Ensure all wiring connections remain secure. Loose connections can lead to intermittent functionality.
- Hold området omkring interfacemodulet fri for overdreven støv eller fugt.
- Do not attempt to open or repair the module.
8. Fejlfinding
If you experience issues with your PAC OS-2X interface, refer to the following table:
| Problem | Mulig årsag | Løsning |
|---|---|---|
| Aftermarket radio has no power. |
|
|
| No sound from aftermarket radio. |
|
|
| OnStar not working or no audio. |
|
|
| Warning chimes are missing or incorrect. |
|
|
| Steering Wheel Controls not functioning. |
|
|
9. Specifikationer
| Feature | Detalje |
|---|---|
| Modelnummer | OS-2X (Item model number: OS2X-SL) |
| Mærke | PAC |
| Kompatibilitet | Select GM Class II Vehicles |
| Bevarede funktioner | OnStar, Warning Chimes, Retained Accessory Power (RAP), Steering Wheel Controls (with compatible radio) |
| Materiale | Kobber, polyvinylklorid (PVC) |
| Varedimensioner (L x B x H) | 9 x 9 x 2 tommer |
| Varens vægt | 0.96 pund (ca. 15.4 ounces) |
| Connector Type | OEM/Deutsch DT |
| UPC | 609098814478, 606523105729 |
10. Garanti og support
10.1 Garantioplysninger
The PAC OS-2X interface comes with a 1 års fabriksgaranti from the date of purchase. This warranty covers defects in materials and workmanship under normal use. It does not cover damage resulting from improper installation, accident, misuse, abuse, neglect, or unauthorized modification.
For warranty claims, please retain your proof of purchase and contact PAC customer support.
10.2 Teknisk support
If you require technical assistance or have questions regarding the installation or operation of your PAC OS-2X interface, please contact PAC technical support. Before contacting support, please ensure you have read this manual thoroughly and performed basic troubleshooting steps.
Contact information for PAC can typically be found on their official webwebstedet eller på produktemballagen.