Metra GMOS-01 Wiring Interface

You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.

You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.

You can check to see if this will fit your vehicle by using our Outfit My Car tool: http://www.crutchfield.com/car/carselector.aspx For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.

You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your factory system. They will be able to pull up your vehicle and see if this will integrate. If it does not, then they will also be able to discuss other options with you.

If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the settings on the product and see if there may be a fix. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer. You can also post your question in our forums: http://community.crutchfield.com. Or try our online support center: http://crutchfield.custhelp.com/app/answers/list/kw/.

Though late in the game this is what I have learned and hope it benefits everyone. The module can be used with amps, BUT you must bypass the module of the amp power and get an additional speaker for the warning chimes (Metra SP-2003 sadly not found at Crutchfield). On my 2004 Chevy Colorado I tried using one of the tweeters that I removed (when I upgraded to components) for the chime but it was too quiet whether it was wired before or after the inline resistor. Metra has specific instructions for using this module with amps on page 7 of the owners manual. I do NOT have OnStar so have no idea how this would play in, but if you want your warning chimes on a NON-OnStar vehicle then it appears getting the Metra SP-2003 (or possibly any 12V speaker with a good volume level) appears to be the only route to take when using amps and the Metra GMOS-01. I plan on ordering the SP-2003 in the near future but for now this is the best I have to offer. I do not pretend to know everything, or anything, but this is what my research has come up with and hope it helps any one looking for the same answers I had about the "amp" situation.

Hi, I didn't added an amp to my car, but I'm using the module, I have a 2005 buick lacrosse equipped with on-star. This module helps you keep the door chimes sound for door opens, or seat bealt alerts. Also keeps a Connction going from the radio to the rear view visor that has the built-in Mic in order to talk to the on-star assistant. The radio I bought with this module has its own Mic which I use for phone calls using the Bluetooth service. Hope this information helps.

Hi Mike, This unit doesn't have line level inputs or outputs. Provided the unit can handle the additional power of the amplifier, you could hook it up post amp. The purpose of this unit is to allow the OnStar system to use your speakers for communications. If you are wiring head unit-amp-speaker and bypassing the factory wiring and you are not worried with your OnStar the you really don't need it. Hope this helps Will MECP certified installer

Mike M, I installed this in a GMC Envoy XL using just the standard speakers. I believe the adapter was required for maintaining the OnStar capabilities thru the new head unit. Unfortunately I didn't add additional amplifiers like you are but I believe the wiring would still be similar to the diagrams provided. I probably didn't give you much help with my answer but I think you should try to keep the adapter in the setup. I wired and soldered everything before hand before I even went out to the car so everything plugged in nicely once I got started. Good luck!

The wiring harness makes this much easier to splice into the factory system - I suppose you CAN do it without but you'll have a lot more heartache and virtually no complications this way. This helps you retain OnStar and the door chime which will both disappear if you do not use this. There is also a PAC unit for GM cars that also works but you do not retain OnStar or the chime - which is the route I went. I have a Hummer H3 and this was necessary as the car had an external amp for the separates and no subwoofer. I added a sub (JL Audio Stealthbox) and new amp to replace the factory amp and a whole new amp for the sub.