GM/LAN Amplified/Non-Amplified OnStar Integrated Harness for 2006-Up Select GM Vehicles
Product highlights
• Radio Replacement Interface
• Designed For 2007-Up GM Vehicles With OnStar, RAP & Factory Amplifiers
• Retains OnStar Functionality, Warning Chimes, and Parking Assist Chimes
Radio Replacement Interface for select GM / Chevrolet vehicles 2006-up. This Harness will allow you to retain Onstar, RAP & FACTORY AMPLIFIERS (Bose, Monsoon etc.). It is not included in our standard free harness offer when a head unit is purchased.
Please use our Fitment Guide to determine specific compatibility for the submodel and audio features
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Manufacturer:
Model Number:
GM21SR
Weight:
0.75lbs
Internal SKU:
gm21sr
Internal Product ID:
9414
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It works.
I have a 2007 New body Silverado with Bose and On-Star. There are 4 connectors that plug into this box that are not very secure at all, but I ran tie-wraps around them to make a tight connection. Once everything was put in, I was able to retain the factory amplifier, door chimes, blinkers, OnStar and everything else. Also, my factory Bose speakers sounded 1000 times better.
Beware, the actual box is pretty big, and there are alot of wires coming to/from it, so it makes it a pain to stuff it all in your dash, especially with iPod controllers, amplifier RCA cables and etc. I had to cut a piece of plastic from the dash with a sawzall to make it all fit.
20 found this helpful
scosche gm21sr
This unit works well with a 06 impala SS. Very easy to install and it kept all the chimes working flawlessly. The impala has a bose audio system, just the regular one, not the "premium" which is NOT compatible with this unit, hope this helps...
18 found this helpful
Great
Matched perfect! Everything accounted for. Reasonable price! Best deal I found!
17 found this helpful
Great place to do business
We have bought two Sirius radio and camera etc for each of our cars, and we love them. The people here are terrific to do business with. They do terrific work and have best products.
19 found this helpful
Waste of money
The main problem I have is that the adapter does not have solid connections. Everytime I hit a bump a buzzing sound could be heard in the speakers. Packing insulation foam around the connects worked for a little while. I got fed up and bought the PAC-4 which is more expensive but a far superior adapter
17 found this helpful
Not worth it
I've had this thing for 6 months now...
Got this for a 09 Silverado 2500HD. The chimes do work OK such as low fuel, light left on ect.... However the turn single is the most annoying sound I have ever heard. Although you can turn down the sound of most ALL other warring chimes, BUT NOT THE TURN SIGNAL????
The door lock chime hardly ever works the way it should.
Way over priced... If I was you I'd look for something better, or do with out.
18 found this helpful
Not bad
This product works well, i had trouble at first with the wire connections coming loose inside the dash but I electrical taped them in tight to make connection and it works fine now. only other complaint is stuffing it in behind a dvd player what a pain! Other than that it does what its supposed to and im happy
17 found this helpful
Does What It's supposed to
This module work as described. This is the first one I tried and it worked fine, not too big was able to fit it behind the radio in the dash. As far as the plugs fitting loose mine seemed to snap in pretty tight , but i still put zip ties around them just in case.
15 found this helpful
Great Buy
this item worked great for me i dont know what these other idoits did to it but it work good for me
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Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:
Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.
