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Metra GMRC-04 Wiring Interface

Connect a new car stereo and retain the door chimes and audible safety warnings in select 2000-up GM vehicles

Item # 120GMRC04

Problem : Installing an aftermarket receiver in some 2000-up General Motors vehicles means losing audible safety...

Find what Fits your vehicle

Problem : Installing an aftermarket receiver in some 2000-up General Motors vehicles means losing audible safety...

Discontinued item
2 questions - 2 answers

Item # 120GMRC04

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About the Metra GMRC-04 Wiring Interface

Zak Billmeier
Problem: Installing an aftermarket receiver in some 2000-up General Motors vehicles means losing audible safety warnings.

Problem: Installing an aftermarket receiver in some 2000-up General Motors vehicles means losing audible safety warnings.

Solution: Metra's GMRC-04 GM data bus interface lets you replace the factory receiver in these vehicles while keeping the door chime and audible safety warnings. Hook the GMRC-04 to your aftermarket radio, mount the module, and plug it into the existing factory plug. Get the great sound you want, and keep all important safety features intact.

Also, once you turn off the ignition in these GM vehicles, the radio continues to play until you open the door. This interface maintains that function with your new aftermarket radio. This interface is compatible with select 2000-up GM vehicles. If you haven't done so already, please enter your vehicle information or call an Advisor at 1-888-955-6000 to find out if this item is compatible with your vehicle. Warranty: 1 year.


What's in the box:

  • GM Glass II Data Bus Interface (GMRC--04)
  • 10 Pin-to-32 Pin GM harness
  • Installation instructions

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Crutchfield response

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More details on the Metra GMRC-04 Wiring Interface

Stacey B.

Product Research


Overview: The AXXESS GMRC-04 lets you replace the factory radio in select 2000-2005 GM vehicles. The AXXESS GMRC-04 is designed to be used in non-amplified 2000-2005 GM vehicles without Onstar that have the "Dock-n-Lock" style harness (the radio harness that stays mounted in the dash when the radio is removed). The GMRC-04 retains the warning chimes that will normally be lost when the GM factory radio is removed through the use of an on-board speaker. It will also provide a 12-volt switch accessory wire for proper radio operation

Note: The radio itself is held in by two spring loaded clips, one on each side.

Vehicle Compatibility: The AXXESS GMRC-04 is compatible with the following 2000-2005 GM vehicles (without Onstar), that use the "Dock-n-Lock style harness".

  • 2000-2005 Buick Lesabre
  • 2001-2003 Oldsmobile Aurora
  • 2000-2005 Pontiac Bonneville
Note: The GMRC-04 can be used in the vehicles listed above that come with a factory amplifier; however the factory amplifier must by bypassed. If the vehicle has Onstar, that feature will not work.

Retained Accessory Power (R.A.P.): The ignition power source of most GM vehicles keeps the radio on until one of the doors is opened. This feature is called the R.A.P. (retained accessory power). The GMRC-04 is designed to retain this feature.

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Customer Q&A

2 questions already asked

It appears my wiring harness is wired incorrectly. Looks like the pins were inserted with the plastic connector upside down. Pin A1 ended up as B16 I think. Is this a common manufacturing problem?
[ Dante  Apr 21, 2017 ]
1 answer
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. They can walk you through the connections 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, or try our online support center:
[ KENNETH  Apr 21, 2017 ]  Staff
steering wheel control retained?
[ Robert  Aug 27, 2014 ]
1 answer
The ability to retain steering wheel controls with aftermarket receivers will be determined by the receiver you are using and the vehicle you have. For full information on this type of integration (including the parts you will need) please contact an Advisor by phone (1-800-324-9695) or online chat.
[ KRISTINA  Aug 27, 2014 ]  Staff

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