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

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7 Reviews

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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.

Note: Most vehicles will require additional installation parts — please identify your vehicle if you haven’t done so, then check here for a list of parts. You can also call an Advisor for more information.

Metra GMRC-04 Wiring Interface Reviews

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Did the job

Written By Stephen, Ga on Thursday, April 02, 2015

Crutchfield Customer Review (What's this?)

There were no wiring instructions included

Pros: Keep my retained accessory power and chimes

Cons: No instructions

Don't cut the volume- 2000 Pontiac bonneville

Written By Trent B, Seymoir, In on Saturday, March 28, 2015

Crutchfield Customer Review (What's this?)

I chose not to cut the volume reduction wire on the module. When I mounted it under the dash the chime volume level was perfect.

Pros: Stereo wiring was included! Installation was very easy with this component. Worth the extra expense... I highly recommend this divice.

Cons: None

Works great, but quite overpriced.

Written By Mark L., Minnesota on Tuesday, February 10, 2015

Crutchfield Customer Review (What's this?)

Everything works as it supposed to, makes installing after-market units much easier. The chime function is much louder, and sharper pitched than the stock chime. I wish that I had known this before installing it. I wish that the chime could be tuned, tone adjusted, and volume turned-down easily.

I am very happy, that it works as advertised. It is difficult to swallow, that the wiring harness adaptor costs as much as the radio unit that I installed with it.

Pros: Works, as advertised. Saves a lot of wiring troubles.

Cons: Too Loud. Most difficult to take, the Price for a few wire leads and connector plug is an outrageous price to ask). Love the Crutchfield guys, but this is hard to take. The Metra product works well, but if this is the required cost Crutchfield should be finding another source and/or making their own adaptors!!!

Works, if overpriced.

Written By GeekPriest, Central PA on Tuesday, January 13, 2015

Crutchfield Customer Review (What's this?)

In short: it works. It mates the horrible dock-and-lock connector to a harness and a module to preserve chimes, etc. Instructions could be better. This unit works with a lot of different GM cars, but nailing down the specifics for mine (a 2003 Buick LeSabre) took a bit of guessing. The case doesn't inspire confidence. The tabs weren't real secure, nor was the circuit board glued or otherwise nailed down. I used some epoxy to avoid any potential rattling. For such an expensive unit, they should include mounting tape and velcro.

Pros: It works. The car seems the same as it was before, with chimes, retained power-on, etc.

Cons: Instructions are confusing. To adjust the volume from the default very-loud to something quieter, you have to scratch a trace on the PCB. (!!! Why not include a DIP switch or jumper, so the customer can test which volume is best?! This is the most ridiculous aspect of this design.) The board was loose in the case. Nothing held it down, and the tabs on the case didn't grab securely. I used some epoxy to anchor the board and keep the box closed.

For Buick

Written By JoelR, Otsego,MN on Friday, August 08, 2014

Crutchfield Customer Review (What's this?)

The wire harness was perfect, I personally don't know that the Chimes are really needed but they work.

Pros: Simplified installation.

Cons: The Chimes are very loud and I will have to take the dash apart again to turn it down.

Wrong Adaptor

Written By Luvmychi3, Wisconsin on Tuesday, February 04, 2014

I entered that I had the 2000 Bonneville with 8 speaker option, suggested the GMRC-04 Factory integration adapter, this is only for the door chimes. I needed the GMOS-09 adapter for door chimes, amp, ect, which they do not carry. I ended up ordering the wrong item and had to order the correct option else where.

Pros: Great if you only need to keep the door chimes.

Cons: Only for door chimes

GM Factory Integration Adapter

Written By PaPa AL, Woodbury, TN on Friday, July 27, 2012

Crutchfield Customer Review (What's this?)

Doesn't work perfect. Sometimes, it does not shut off radio with key off after opening door. Never shuts it off if you have door open before shutting engine & removing key.

Pros: Retains chimes.

Cons: Not perfect.

Hands-on research

What's in the box?

Download owner's manual

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

Product Research

Features

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. Please consult the Crutchfield Car Selector to see if your vehicle is compatible.

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.

Our Product Research Team

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