SIRIUS SIR-GM1 SIRIUS satellite radio for 2003-up General Motors vehicles Get a Visa® Prepaid Card by mail* Zoom Front Video loading and will display in just a moment. Photos Videos Does it work with my system? Item# 607SIRGM1 offer details Item# 607SIRGM1 Review Sumary 48 people say Out of Stock Ship date uncertain Contact us Reserve yours risk-free Call Email Chat Email me when available $99.99 You Pay: -$30.00 Web or Mail-in Rebate: Free Crutchfield lifetime tech support Free Shipping Your price $69.99 Add to cart + Add to wishlist See related offers and ways to save Get $30 by mail Special Financing Available Overview Details Customer Reviews Category Info Our take on the SIRIUS SIR-GM1 by Matt Freeman If the factory stereo in your 2003-up General Motors vehicle is satellite radio-ready, you now have the option of adding a SIRIUS radio. This package includes everything that's necessary for you to play SIRIUS through your compatible factory stereo: a SIRIUS radio, a roof-mount antenna, and the adapter cable that connects the radio to your stereo. You can mount the compact radio easily in a convenient spot behind the dash. The adapter cable hooks up to the radio at one end, and to your factory stereo at the other, providing all signal and power connections. The magnetic antenna mounts firmly on your vehicle's roof, and connects to the satellite radio. An extra connection lets you keep a factory (or factory-compatible) CD changer connected to the system. Note: Your in-dash stereo must be have the factory satellite radio option to work with this SIRIUS package. Please enter your vehicle information or call a Sales Advisor at 1-888-955-6000 to check compatibility. If you're not sure whether or not your factory stereo is satellite radio-ready, ask your local dealership. A SIRIUS subscription is also required. Highlights:SIRIUS adapter package includes SIRIUS radio, factory-system adapter cable and box, and roof-mount antennaworks with compatible, satellite radio-ready GM factory stereosaudio cables includedwarranty: 1 yearOur 60-day money-back guarantee Hands-on research from the Crutchfield Labs (what are the Labs?) Features and specs chart | What’s in the box? | In-depth notes Features and Specs Features and Specs General Service Loading... Sirius Compatible Brand Loading... N/A Display Lines Loading... None Channel Presets Loading... None Song Memory Loading... None Built-in FM Transmitter Loading... No Car Kit Loading... No Home Kit Loading... No Changer Jack/Pass-Thru Loading... No NavTraffic Compatible Loading... No Included Antenna Loading... Car Antenna Dimensions and Warranty Width (inches) Loading... 5 Height (inches) Loading... 1-7/16 Depth (inches) Loading... 5-1/8 Parts Warranty Loading... 1 Year Labor Warranty Loading... 1 Year Product Research Product Research What's in the box? Download owner's manual Sirius Satellite Radio tuner Magnetic Sirius antenna with attached 21' cable (right-angle single SMB connector) Factory SDAR interface cable T-harness interface cable Power harness with in-line fuse and filter 5.5" Rubber adhesive backed antenna cable cover/tail 6 Self-tapping screws Antistatic cleaning pad Installation Guide SIR-GM1 Applications list Cadillac CTS Installation Modification sheet Warranty information Our Product Research Team At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices. Features Overview: The SIR-GM1 is a Sirius Satellite Radio tuner that is compatible with select 2003-2008 General Motors vehicles. The package includes the proper interface cables and a magnetic Sirius antenna. In addition to the tuner, a subscription to Sirius Satellite Radio programming is also required. Compatibility: The SIR-GM1 is designed to be compatible with select headunits from 2003-2008 GM vehicles that operate on the Class-2 bus. In many cases, the tuner can replace the factory XM Satellite tuner. It is also compatible with some systems that support Satellite Radio operation, but did not come with a tuner from the factory. Compatible headunit types include CD only, CD + Cassette, and 6-CD changer headunits, as well as Touch Screen and Non-Touch Screen monitor headunits. The factory radios in the majority of the compatible vehicles must have a "BAND" button. In some cases, the radio must have a factory satellite connection (noted by an asterisk in the chart below). The SIR-GM1 is compatible with most additional factory audio accessories that might be included, such as Rear Seat Audio Control Center, Rear Seat Entertainment (DVD/Monitor) System, Heads-up Display, and Steering Wheel controls. Compatible Vehicles: The current list of compatible vehicles includes: Buick Chevrolet Chevrolet cont'd GMC cont'd Pontiac 2005-06 Allure 2003-06 Avalanche 2003-06 Suburban 2003-07 Sierra/Sierra Denali 2003-05 Aztek 2004-05 LeSabre 2004-05 Blazer 2003-06 Tahoe 2003-06 Yukon/Yukon XL 2003-05 Bonneville* 2004-07 Ranier 2003-05 Cavalier 2003-08 Trailblazer Hummer 2003-05 Grand Am 2003-07 Rendezvous 2005-08 Colorado 2005-08 Uplander 2004-05 H1 2004-08 Grand Prix 2005-08 LaCrosse 2005-08 Corvette 2003-05 Venture 2003-07 H2 2003-06 Montana 2005-2006 Montana SV6 2005-07 Terazza 2005-06 Equinox GMC 2008 H3 2006 Torrent Cadillac 2003-06 Express Van 2005-08 Canyon Isuzu 2003-05 Sunfire 2004-07 CTS** 2003-05 Impala 2003-06 Denali/Denali XL 2003-08 Ascender 2004-08 Vibe 2003-06 Escalade EXT/ESV* 2003-05 Monte Carlo 2003-08 Envoy Oldsmobile Saab 2003-05 DeVille* 2004 S-10 2004 Jimmy 2003-04 Alero 2005-07 9-7X 2004-06 SRX* 2003-07 Silverado/HD 2004 S-15/Sonoma 2003-04 Bravada Saturn 2005-08 XLR* 2004-06 SSR 2003-06 Savana Van 2003-04 Silhouette 2005-07 Relay * Radio must have factory satellite connection. **Slight modification of the Factory SDAR Interface cable is required. Tuning Features: The SIR-GM1 is designed to emulate many of the factory SDAR (Satellite Digital Audio Radio) commands found in the vehicle, including Channel Tune (up/down), Fast Tune (up/down), Category Search (up/down), Category Tune (tune within a category), 12 presets (6 for each band), and Preset Scan (up). Display Capability: When the SIR-GM1 is installed it has the capability to show the following information on the headunit display: Channel Number, Channel Name, Category Name, Artist Name, and Song Title Name. The number of characters displayed in the Artist Name or Song Title Name varies by headunit type (8 or 16 characters). Text Scrolling and/or Paging is not supported with the SIR-GM1. Product Reviews Review this product Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information. 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Submit Share this product 1-10 of 48 items >> 10 Per Page 20 Per Page 50 Per Page Sort Results By: Date Reviewed | Rating | Helpfulness 4 out of 5 Install in 2003 Suburban Written By lbdaggett, Long Beach, CA on Wednesday, August 03, 2011 As petroboy43 noted, please read all the reviews. The hardest part of install of the unit behind the dash. My vehicle was not an original XM vehicle, and mounting behind the glove box is impossible with the supplied T-Wires. I was able to place it in the dash below the center venting duct and behind the storage cubby directly below. That alone took a bit more than an hour. The rest was simple. Tapped into 12V power supply in center console, which is very easy to access. Being a suburban, I needed every inch of the antennae wire. Mounted it on rear of roof, and ran wire behind third break light and used existing grommet to run wire into headliner. Plastic trim pieces come apart easy. Fired up first time, activated no problem. Only complaint is that the antennae does not work as well as my other newer vehicle's factory sirius set up. Was this review helpful? Yes | No 5 out of 5 SIRIUS SIR-GM1 Written By George B, Warrior,Al. on Thursday, January 27, 2011 This item wasn't available from the dealer, however I purchased it from Crutchfield and it works perfectly. It plugs into the factory harness easily and comews through the display like a factory unit. Great! Was this review helpful? Yes | No 5 out of 5 2005 Rendezvous with Factory Stereo Written By Dayve, Bedford, Ohio on Tuesday, February 03, 2009 This was an easy install and took about an hour to complete. I knew in advance about the short t-cable and took that into account before I started. The antenna was mounted on the rear and run down the passenger side to be hidden in the sill trim and the unit itself was placed just below the center console airducts and tie wrapped securely to the passenger side console. The power and ground I picked up in the lower driver's footwell when I tapped into the cigarette lighter. The unit fired right up and displayed correctly on the display. I was able to retain the steeringwheel controls which was useful because of the safety feature and my wife now has Sirius again.( I'm still her Hero!)I suggest that you look at the length of the cable and determine where you're going to put the unit before you start, saves loads of time. Service was great as always with Crutchfield even though they were out of stock after I ordered and let me know right away. This is definitely the best and cheapest way to gain factory Sirius in your GM vehicle. Was this review helpful? Yes | No 4 out of 5 2003 GMC Sierra ext cab Written By hurst7t9, Scranton, PA on Saturday, December 13, 2008 The biggest help was the other reviews on this board. Installation of the antenna and SIRGM1 took about 3 hours. Antenna mounted on roof and wired through third brake light, across headliner to the pass rear pillar, down pillar under edge of carpet and up beind glove box. Since I had the resources and I knew about the T harness being too short, I made the T harness about 12 inches longer. Perfect length. Mounted the SIRGM1 using three of the supplied screws to the firewall, just above a wire that is routed on the firewall. Removed radio, routed wiring harness behind the dash to the radio. Plugged blue connector into radio, plugged in antenna and main radio harness. Tapped into cigarette lighter power and ground for SIRGM1 power and ground. T harness plug was very difficult to plug in and took about 1.5 hours to make T harness longer. If it wasn't for those two things I would have given it 5 out of 5 stars. Works perfectly, like it was always there. 2 out of 2 people found this helpful Was this review helpful? Yes | No 4 out of 5 Worth the price and effort for Factory look Written By Vinchenzo, NJ on Monday, March 31, 2008 pros 1) Price is reasonable 2) sound is better than i expected. i dont have bose radio, and i was never happy with over the air sound quality for fm. this unit is just as good if not a bit better. I would say the quality is better than a plug and play unit. 3) Can't beat the factory look 4) Functions well with factory radio (head unit) Cons 1) installation in not simple a) directions that came with unit were not great aa) they did not suggest or even adress a mounting location bb) they do not tell you you need to go through a series of steps to reset the radio so it can recognize the new tuner cc) they dont mention that with the t harness unless you have another accesory, you will not need to use all three connectors b) the t- harness that comes with the unit (this is the one you will use if your vehicle did not come with xm from the factory) is too short. c) tech help, was not great. I have used them for previous installs any they were great. this time, i spoke with three different techs and received conflicting information. (one insisted that i needed to use all the inputs on the t harness, even though i was not using any accesories. another failed to mention i needed to rest the radio overall good value and worth the effort 2 out of 2 people found this helpful Was this review helpful? Yes | No 4 out of 5 SIR-GM1 06 Sierra 2500 bose/6chngr/xm Written By Dan, Phx, Az on Tuesday, March 25, 2008 Installation wasn't slightly difficult. Used the knowledge from other reviews. Bracket for the XM module had the screws threaded from the reverse side. Very difficult to get them undone in the small space. I reversed the screws in the bracket once assembled to ease the reinstallation of the bracket with sirius unit ziptied to it. ------------------------------------------ As fo the function of the unit, there is a noticeable blank screen until the unit connects. Not sure of the reason, but it has a 3-4 second pause before the factory radio displays anything. This only happens when the sir unit was the last active when powered off then on. Overall the unit performs very well. No signal strength issues. Was this review helpful? Yes | No 4 out of 5 Service Great...Reception poor on Corvette Written By Daniel, West Palm Beach FL on Sunday, February 03, 2008 I switched out the factory XM receiver for the SIR-GM1. The installation was as easy as could be. The reception, however leaves much to be desired. I gathered from other audio websites that the issue is the fact that the Corvette is not a metal-bodied car. The car acts as part of the antenna. I do love Sirius service, but I will continue to work at getting better recpetion so the music does not cut out. I had the service in my Mustang, and the reception was much better. I used the SIR-KEN1 for that installation. Overall I would do it again, as the talk stations are not that bad, but the music does suffer from dropouts. I gave this a 4 star rating because the equipment works as advertised, but the car makes reception difficult. 5 out of 5 people found this helpful Was this review helpful? Yes | No 3 out of 5 SIR GM-1 Written By jvnova67, central Mass on Sunday, January 06, 2008 The t-harness definately isn't long enough.Installation was a little more challenging than I thought!There were two connections on my stock 2003 Chevy Silverado radio.One of which I disconnected upon radio removal and the other was empty.The empty one is for the bus-2 communication.After careful reading of the installation literature, it would appear as though a factory connection from the vehicle side needs to be plugged into the t-harness.Apparently this is not needed on my application.Some clarification through tech-support pointed me in the right direction.I feel the installation instructions could have been more specific. 2 out of 2 people found this helpful Was this review helpful? Yes | No 3 out of 5 OK for the money Written By Jim, Bel Air, MD on Thursday, November 29, 2007 As many others have said, the T harness just isn't long enough. Stock satellite tuner location is behind the glove box in my Olds Alero. T Harness is about 3 inches too short to mount there. It's rigged up behind the climate controls with some zip ties and double back sticky tape. Other than that, the installation was easy with most of the time routing the antenna wire under trim. Power was supplied through the auxillary power point next to the glove box. I would only rate the signal as so-so. I'll loose signal for a good 5 or 6 seconds if I drive by some tall trees. The stock Sirius in my Jeep Grand Cherokee has never lost signal as long as I was moving. Good alternative to plug and play systems if you live in an area without bridges, or trees, or hills. 1 out of 2 people found this helpful Was this review helpful? Yes | No 4 out of 5 2004 Impala Written By Intrepid1, Baltimore, Md. on Thursday, October 11, 2007 Install behind the dash is impossible. After removing radio and connecting the T-Harness, I let it through a hole to the right of the Radio and down to the back of the cubby hole that sits beneath the climate controls. The supplied power harness is not long enough to reach the battery through the firewall so I got a hot connection in the passenger fuse box. The Sir-GM1 is strapped behind the cubby hole out of sight and activated. I gave it 4 stars and not 5 because the T-Harness lenght is too short to place the tuner under the seat. My antennae that has a 21ft. cable is too short to reach the the back roof from its present location, but would reach if could install tuner under seat. The tuner works great otherwise. Looking for a longer T-Harness, COME ON Sirius! Was this review helpful? Yes | No 1-10 of 48 items >> Learn more about Car-only Satellite Radio Packages Learn more about Car-only Satellite Radio Packages What Are Dedicated Car Satellite Radios? What Are Dedicated Car Satellite Radios? Matt Freeman 11/3/2011 based on 21 ratings (6 comments) An overview of satellite radios that work exclusively in the car. Video: How to Install a Satellite Radio or GPS Antenna Video: How to Install a Satellite Radio or GPS Antenna Robert Ferency-Viars 7/23/2010 based on 53 ratings (16 comments) Crutchfield shows you how to install an antenna in your vehicle for a satellite radio or GPS navigation system. Satellite Radio Programming Packages Satellite Radio Programming Packages Zak Billmeier 1/2/2012 based on 27 ratings (19 comments) The radio you have determines which satellite radio plan you can get. Find out what's available for your particular radio, plus check out a channel guide. Everything you need to know about satellite radio Everything you need to know about satellite radio Zak Billmeier 12/8/2011 based on 63 ratings (18 comments) An overview of satellite radio. What Are Car Kits? What Are Car Kits? Matt Freeman 12/7/2011 based on 10 ratings An overview of car kits used with Dock & Play satellite radios. Visit our Learning Center to learn more about Car-only Satellite Radio Packages For a more in-depth review and enhanced detailed information on the SIRIUS SIR-GM1, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_607SIRGM1/SIRIUS-SIR-GM1.html ). Recommended Accessories See more accessories Your featured item SIRIUS SIR-GM1 SIRIUS satellite radio for 2003-up General Motors vehicles $69.99 Out of Stock After $30.00 Web or Mail-in Rebate Protect your gear with an extended warranty Add 3 Year Warranty Square Trade Warranty $13.99 In Stock Add selected to cart close X Can we help you find something or answer a question? 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Our take on the SIRIUS SIR-GM1 by Matt Freeman If the factory stereo in your 2003-up General Motors vehicle is satellite radio-ready, you now have the option of adding a SIRIUS radio. This package includes everything that's necessary for you to play SIRIUS through your compatible factory stereo: a SIRIUS radio, a roof-mount antenna, and the adapter cable that connects the radio to your stereo. You can mount the compact radio easily in a convenient spot behind the dash. The adapter cable hooks up to the radio at one end, and to your factory stereo at the other, providing all signal and power connections. The magnetic antenna mounts firmly on your vehicle's roof, and connects to the satellite radio. An extra connection lets you keep a factory (or factory-compatible) CD changer connected to the system. Note: Your in-dash stereo must be have the factory satellite radio option to work with this SIRIUS package. Please enter your vehicle information or call a Sales Advisor at 1-888-955-6000 to check compatibility. If you're not sure whether or not your factory stereo is satellite radio-ready, ask your local dealership. A SIRIUS subscription is also required. Highlights:SIRIUS adapter package includes SIRIUS radio, factory-system adapter cable and box, and roof-mount antennaworks with compatible, satellite radio-ready GM factory stereosaudio cables includedwarranty: 1 yearOur 60-day money-back guarantee
Hands-on research from the Crutchfield Labs (what are the Labs?) Features and specs chart | What’s in the box? | In-depth notes Features and Specs Features and Specs General Service Loading... Sirius Compatible Brand Loading... N/A Display Lines Loading... None Channel Presets Loading... None Song Memory Loading... None Built-in FM Transmitter Loading... No Car Kit Loading... No Home Kit Loading... No Changer Jack/Pass-Thru Loading... No NavTraffic Compatible Loading... No Included Antenna Loading... Car Antenna Dimensions and Warranty Width (inches) Loading... 5 Height (inches) Loading... 1-7/16 Depth (inches) Loading... 5-1/8 Parts Warranty Loading... 1 Year Labor Warranty Loading... 1 Year Product Research Product Research What's in the box? Download owner's manual Sirius Satellite Radio tuner Magnetic Sirius antenna with attached 21' cable (right-angle single SMB connector) Factory SDAR interface cable T-harness interface cable Power harness with in-line fuse and filter 5.5" Rubber adhesive backed antenna cable cover/tail 6 Self-tapping screws Antistatic cleaning pad Installation Guide SIR-GM1 Applications list Cadillac CTS Installation Modification sheet Warranty information Our Product Research Team At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices. Features Overview: The SIR-GM1 is a Sirius Satellite Radio tuner that is compatible with select 2003-2008 General Motors vehicles. The package includes the proper interface cables and a magnetic Sirius antenna. In addition to the tuner, a subscription to Sirius Satellite Radio programming is also required. Compatibility: The SIR-GM1 is designed to be compatible with select headunits from 2003-2008 GM vehicles that operate on the Class-2 bus. In many cases, the tuner can replace the factory XM Satellite tuner. It is also compatible with some systems that support Satellite Radio operation, but did not come with a tuner from the factory. Compatible headunit types include CD only, CD + Cassette, and 6-CD changer headunits, as well as Touch Screen and Non-Touch Screen monitor headunits. The factory radios in the majority of the compatible vehicles must have a "BAND" button. In some cases, the radio must have a factory satellite connection (noted by an asterisk in the chart below). The SIR-GM1 is compatible with most additional factory audio accessories that might be included, such as Rear Seat Audio Control Center, Rear Seat Entertainment (DVD/Monitor) System, Heads-up Display, and Steering Wheel controls. Compatible Vehicles: The current list of compatible vehicles includes: Buick Chevrolet Chevrolet cont'd GMC cont'd Pontiac 2005-06 Allure 2003-06 Avalanche 2003-06 Suburban 2003-07 Sierra/Sierra Denali 2003-05 Aztek 2004-05 LeSabre 2004-05 Blazer 2003-06 Tahoe 2003-06 Yukon/Yukon XL 2003-05 Bonneville* 2004-07 Ranier 2003-05 Cavalier 2003-08 Trailblazer Hummer 2003-05 Grand Am 2003-07 Rendezvous 2005-08 Colorado 2005-08 Uplander 2004-05 H1 2004-08 Grand Prix 2005-08 LaCrosse 2005-08 Corvette 2003-05 Venture 2003-07 H2 2003-06 Montana 2005-2006 Montana SV6 2005-07 Terazza 2005-06 Equinox GMC 2008 H3 2006 Torrent Cadillac 2003-06 Express Van 2005-08 Canyon Isuzu 2003-05 Sunfire 2004-07 CTS** 2003-05 Impala 2003-06 Denali/Denali XL 2003-08 Ascender 2004-08 Vibe 2003-06 Escalade EXT/ESV* 2003-05 Monte Carlo 2003-08 Envoy Oldsmobile Saab 2003-05 DeVille* 2004 S-10 2004 Jimmy 2003-04 Alero 2005-07 9-7X 2004-06 SRX* 2003-07 Silverado/HD 2004 S-15/Sonoma 2003-04 Bravada Saturn 2005-08 XLR* 2004-06 SSR 2003-06 Savana Van 2003-04 Silhouette 2005-07 Relay * Radio must have factory satellite connection. **Slight modification of the Factory SDAR Interface cable is required. Tuning Features: The SIR-GM1 is designed to emulate many of the factory SDAR (Satellite Digital Audio Radio) commands found in the vehicle, including Channel Tune (up/down), Fast Tune (up/down), Category Search (up/down), Category Tune (tune within a category), 12 presets (6 for each band), and Preset Scan (up). Display Capability: When the SIR-GM1 is installed it has the capability to show the following information on the headunit display: Channel Number, Channel Name, Category Name, Artist Name, and Song Title Name. The number of characters displayed in the Artist Name or Song Title Name varies by headunit type (8 or 16 characters). Text Scrolling and/or Paging is not supported with the SIR-GM1.
4 out of 5 Install in 2003 Suburban Written By lbdaggett, Long Beach, CA on Wednesday, August 03, 2011 As petroboy43 noted, please read all the reviews. The hardest part of install of the unit behind the dash. My vehicle was not an original XM vehicle, and mounting behind the glove box is impossible with the supplied T-Wires. I was able to place it in the dash below the center venting duct and behind the storage cubby directly below. That alone took a bit more than an hour. The rest was simple. Tapped into 12V power supply in center console, which is very easy to access. Being a suburban, I needed every inch of the antennae wire. Mounted it on rear of roof, and ran wire behind third break light and used existing grommet to run wire into headliner. Plastic trim pieces come apart easy. Fired up first time, activated no problem. Only complaint is that the antennae does not work as well as my other newer vehicle's factory sirius set up. Was this review helpful? Yes | No
5 out of 5 SIRIUS SIR-GM1 Written By George B, Warrior,Al. on Thursday, January 27, 2011 This item wasn't available from the dealer, however I purchased it from Crutchfield and it works perfectly. It plugs into the factory harness easily and comews through the display like a factory unit. Great! Was this review helpful? Yes | No
5 out of 5 2005 Rendezvous with Factory Stereo Written By Dayve, Bedford, Ohio on Tuesday, February 03, 2009 This was an easy install and took about an hour to complete. I knew in advance about the short t-cable and took that into account before I started. The antenna was mounted on the rear and run down the passenger side to be hidden in the sill trim and the unit itself was placed just below the center console airducts and tie wrapped securely to the passenger side console. The power and ground I picked up in the lower driver's footwell when I tapped into the cigarette lighter. The unit fired right up and displayed correctly on the display. I was able to retain the steeringwheel controls which was useful because of the safety feature and my wife now has Sirius again.( I'm still her Hero!)I suggest that you look at the length of the cable and determine where you're going to put the unit before you start, saves loads of time. Service was great as always with Crutchfield even though they were out of stock after I ordered and let me know right away. This is definitely the best and cheapest way to gain factory Sirius in your GM vehicle. Was this review helpful? Yes | No
4 out of 5 2003 GMC Sierra ext cab Written By hurst7t9, Scranton, PA on Saturday, December 13, 2008 The biggest help was the other reviews on this board. Installation of the antenna and SIRGM1 took about 3 hours. Antenna mounted on roof and wired through third brake light, across headliner to the pass rear pillar, down pillar under edge of carpet and up beind glove box. Since I had the resources and I knew about the T harness being too short, I made the T harness about 12 inches longer. Perfect length. Mounted the SIRGM1 using three of the supplied screws to the firewall, just above a wire that is routed on the firewall. Removed radio, routed wiring harness behind the dash to the radio. Plugged blue connector into radio, plugged in antenna and main radio harness. Tapped into cigarette lighter power and ground for SIRGM1 power and ground. T harness plug was very difficult to plug in and took about 1.5 hours to make T harness longer. If it wasn't for those two things I would have given it 5 out of 5 stars. Works perfectly, like it was always there. 2 out of 2 people found this helpful Was this review helpful? Yes | No
4 out of 5 Worth the price and effort for Factory look Written By Vinchenzo, NJ on Monday, March 31, 2008 pros 1) Price is reasonable 2) sound is better than i expected. i dont have bose radio, and i was never happy with over the air sound quality for fm. this unit is just as good if not a bit better. I would say the quality is better than a plug and play unit. 3) Can't beat the factory look 4) Functions well with factory radio (head unit) Cons 1) installation in not simple a) directions that came with unit were not great aa) they did not suggest or even adress a mounting location bb) they do not tell you you need to go through a series of steps to reset the radio so it can recognize the new tuner cc) they dont mention that with the t harness unless you have another accesory, you will not need to use all three connectors b) the t- harness that comes with the unit (this is the one you will use if your vehicle did not come with xm from the factory) is too short. c) tech help, was not great. I have used them for previous installs any they were great. this time, i spoke with three different techs and received conflicting information. (one insisted that i needed to use all the inputs on the t harness, even though i was not using any accesories. another failed to mention i needed to rest the radio overall good value and worth the effort 2 out of 2 people found this helpful Was this review helpful? Yes | No
4 out of 5 SIR-GM1 06 Sierra 2500 bose/6chngr/xm Written By Dan, Phx, Az on Tuesday, March 25, 2008 Installation wasn't slightly difficult. Used the knowledge from other reviews. Bracket for the XM module had the screws threaded from the reverse side. Very difficult to get them undone in the small space. I reversed the screws in the bracket once assembled to ease the reinstallation of the bracket with sirius unit ziptied to it. ------------------------------------------ As fo the function of the unit, there is a noticeable blank screen until the unit connects. Not sure of the reason, but it has a 3-4 second pause before the factory radio displays anything. This only happens when the sir unit was the last active when powered off then on. Overall the unit performs very well. No signal strength issues. Was this review helpful? Yes | No
4 out of 5 Service Great...Reception poor on Corvette Written By Daniel, West Palm Beach FL on Sunday, February 03, 2008 I switched out the factory XM receiver for the SIR-GM1. The installation was as easy as could be. The reception, however leaves much to be desired. I gathered from other audio websites that the issue is the fact that the Corvette is not a metal-bodied car. The car acts as part of the antenna. I do love Sirius service, but I will continue to work at getting better recpetion so the music does not cut out. I had the service in my Mustang, and the reception was much better. I used the SIR-KEN1 for that installation. Overall I would do it again, as the talk stations are not that bad, but the music does suffer from dropouts. I gave this a 4 star rating because the equipment works as advertised, but the car makes reception difficult. 5 out of 5 people found this helpful Was this review helpful? Yes | No
3 out of 5 SIR GM-1 Written By jvnova67, central Mass on Sunday, January 06, 2008 The t-harness definately isn't long enough.Installation was a little more challenging than I thought!There were two connections on my stock 2003 Chevy Silverado radio.One of which I disconnected upon radio removal and the other was empty.The empty one is for the bus-2 communication.After careful reading of the installation literature, it would appear as though a factory connection from the vehicle side needs to be plugged into the t-harness.Apparently this is not needed on my application.Some clarification through tech-support pointed me in the right direction.I feel the installation instructions could have been more specific. 2 out of 2 people found this helpful Was this review helpful? Yes | No
3 out of 5 OK for the money Written By Jim, Bel Air, MD on Thursday, November 29, 2007 As many others have said, the T harness just isn't long enough. Stock satellite tuner location is behind the glove box in my Olds Alero. T Harness is about 3 inches too short to mount there. It's rigged up behind the climate controls with some zip ties and double back sticky tape. Other than that, the installation was easy with most of the time routing the antenna wire under trim. Power was supplied through the auxillary power point next to the glove box. I would only rate the signal as so-so. I'll loose signal for a good 5 or 6 seconds if I drive by some tall trees. The stock Sirius in my Jeep Grand Cherokee has never lost signal as long as I was moving. Good alternative to plug and play systems if you live in an area without bridges, or trees, or hills. 1 out of 2 people found this helpful Was this review helpful? Yes | No
4 out of 5 2004 Impala Written By Intrepid1, Baltimore, Md. on Thursday, October 11, 2007 Install behind the dash is impossible. After removing radio and connecting the T-Harness, I let it through a hole to the right of the Radio and down to the back of the cubby hole that sits beneath the climate controls. The supplied power harness is not long enough to reach the battery through the firewall so I got a hot connection in the passenger fuse box. The Sir-GM1 is strapped behind the cubby hole out of sight and activated. I gave it 4 stars and not 5 because the T-Harness lenght is too short to place the tuner under the seat. My antennae that has a 21ft. cable is too short to reach the the back roof from its present location, but would reach if could install tuner under seat. The tuner works great otherwise. Looking for a longer T-Harness, COME ON Sirius! Was this review helpful? Yes | No
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