GMOS-10 - Data Interface Metra - Free user manual and instructions
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| Product Type | Data Interface |
| Brand | Metra |
| Model | GMOS-10 |
| Compatibility | Select GM vehicles 1998-2008 (e.g., Silverado, Tahoe, Yukon, Suburban, Avalanche, Trailblazer) with factory OnStar and chime modules |
| Function | Allows aftermarket stereo installation while retaining factory OnStar, door chimes, and retained accessory power (RAP) |
| Audio Output | 4-channel RCA line-level output for aftermarket amplifier integration |
| Input Power | 12V DC (vehicle ignition/accessory) |
| Current Draw | < 50 mA standby |
| Wiring Harness | Pre-wired interface harness with color-coded wires for standard aftermarket radios |
| Installation | Plug-and-play, no programming required |
| Dimensions (approx.) | 4.5 x 2.5 x 1.0 inches (11.4 x 6.4 x 2.5 cm) |
| Weight (approx.) | 6.4 oz (182 g) |
| Safety | Built-in fuse protection against short circuit |
| Maintenance | No user-serviceable parts; clean with dry cloth |
| In the Box | GMOS-10 interface, wiring harness, instruction manual |
| Warranty | 1-year limited warranty |
| Repairability | Designed for replacement; no field repairs |
| Certification | Meets or exceeds federal safety standards (typical) |
Frequently Asked Questions - GMOS-10 Metra
What is the Metra GMOS-10?
The GMOS-10 is a data interface module that allows you to install an aftermarket radio in select GM vehicles while retaining factory features like OnStar, door chimes, and retained accessory power.
Which vehicles are compatible with the GMOS-10?
It fits many GM trucks, SUVs, and cars from 1998 to 2008, including Chevrolet Silverado, Tahoe, Suburban, Avalanche, Trailblazer; GMC Sierra, Yukon, Denali; Cadillac Escalade; and more. Check the included fit guide or Metra's website for a complete list.
Does the GMOS-10 require programming?
No. The GMOS-10 is designed to be plug-and-play. Simply connect the wiring harness between your vehicle's factory wiring and your aftermarket radio. No programming or flashing is needed.
Will I keep my OnStar function?
Yes, the GMOS-10 retains OnStar operation, including the steering wheel call/answer buttons (if your vehicle has them). It also preserves the factory microphone wiring.
Will my door chimes still work?
Absolutely. One of the primary functions of the GMOS-10 is to retain the factory chime module, so your door chimes and warning sounds will remain intact after the radio upgrade.
Does this module retain steering wheel controls?
No, the GMOS-10 does not interface with steering wheel controls. For steering wheel button retention, you'll need an additional adapter such as the Metra ASWC-1, which can be used alongside the GMOS-10.
Can I use my factory Bose amplifier with this interface?
Yes, the GMOS-10 supports vehicles equipped with the Bose sound system. It provides RCA outputs that can connect directly to the Bose amp, or you can bypass it depending on your setup.
What is retained accessory power (RAP) and why does it matter?
RAP keeps your radio working for a short time after you turn off the ignition until you open a door. The GMOS-10 ensures RAP functionality is retained, so your aftermarket radio behaves like the factory unit.
How do I install the GMOS-10?
Installation is straightforward: disconnect the negative battery cable, connect the GMOS-10 harness to the vehicle's factory wiring, then connect the 12-pin and 20-pin connectors to the module. Mount the module securely and connect your aftermarket radio. Detailed steps are in the manual.
What should I do if my GMOS-10 is not working?
First, verify all connections are secure and check the built-in fuse. Ensure the vehicle's ignition is on and that you have a good ground. If problems persist, consult the troubleshooting section of the manual or contact Metra technical support.
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USER MANUAL GMOS-10 Metra
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Product information
Brand : Metra
Model : GMOS-10
Category : Data Interface