Rear radio in envoy not working. It will not come on at all.Front radio works fine.

That is always a problem with Mix and Match. Check wiring

2003 GMC Envoy Radio Wire Guide

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Our 2003 GMC Envoy radio wiring diagram shows you all the radio wire colors and what they do. Table of Contents. 2003 GMC Envoy Radio Wiring Diagram; 2003 GMC ...

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so any testing done with the fuel system throttle body --fuel delivery -pressure--etc---trans check ---any pending or active codes

Check the wiring harness on the back of the radio to see if it's loose. If you have a Bose system, the amplifier may be going bad.

These are the radio wiring colors on a GMC Silverado:
Car Radio illumination wire: Brown
Radio ground wire: White/Black
Stereo Amp trigger wire: Pink
Stereo dimmer wire: Gray
Left front speaker + wire: Tan
Left front speaker - wire: Gray
Right front speaker - wire: Dark green
Right front speaker + wire: Light green
Left rear speaker - wire: Yellow
Left rear speaker + wire: Brown
Right rear speaker - wire: Light blue
Right rear speaker + wire: Dark blue

2002 GMC Envoy Car Stereo Wiring Chart
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: The radio harness does not provide a switched power source. Run a wire to the fusebox or ignition switch harness for switched power.
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

hi...

please check weather these wires are secured properly...
these are the wires coming from the player please trace whr these wires go you can get the booster amplifier

Car Stereo Amp Trigger Wire: Gray/Green
Left Front Speaker Positive Wire (+): Green
Left Front Speaker Negative Wire (-): Green/Brown
Right Front Speaker Positive Wire (+): Gray
Right Front Speaker Negative Wire (-): Gray/Brown
Left Rear Speaker Positive Wire (+): Green/Black
Left Rear Speaker Negative Wire (-): Green/Orange
Right Rear Speaker Positive Wire (+): Gray/Black
Right Rear Speaker Negative Wire (-): Gray/Pink

if my answer was usefull please vote

No it means the other side has come disconnected or is bumping up against another wire and shorting the speaker out. You need to trace the wire in question and I would hook the speaker back up and take the radio part way out of the dash. Then with the radio on move aroung the wires with your hand behind the radio and see if you hear that speaker coming off and on. If so your close. Just trace it to the problem by continuing to move the wires. If it is not back behind the radio then start at the speaker end and follow that wire with the radio on until you come to either a broken wire or a bare spot in the wire touching metel and fix it accordingly. Let me know how this turns out and please leave me a good thumbs up for trying for you. Raz

Have you removed the original connector from you original stereo? If you still have the original connector in place you can get a new connector from the Ford dealer that will plug into your existing wiring and into your new deck. Ford connections are unique to Ford and you need to adapt them for this application.

Take the car and deck to the dealer and tell them what you need. Everything just plugs in and your original amp and speakers in the car will work.

Having said that there was an adapter available at Wal Mart of all places that did work. You may want to check there.

If you have removed the original connector then you need a wiring diagram.

1992 Ford Probe Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Blue/Red
Radio Switched 12V+ Wire: Blue/White
Radio Ground Wire: Chassis
Radio Illumination Wire: Light Green/Black
Radio Dimmer Wire: N/A
Radio Power Antenna Trigger Wire: White
Radio Amplifier Turn On Trigger Wire: N/A
Front Speakers Size: 6 1/2′
Front Speakers Location: Doors
Left Front Speaker Wire (+): Blue/Orange
Left Front Speaker Wire (-): Blue/Black
Right Front Speaker Wire (+): Blue
Right Front Speaker Wire (-): Blue/Green
Rear Speakers Size: 6 1/2′
Rear Speakers Location: Side Panels
Left Rear Speaker Wire (+): Green/Orange
Left Rear Speaker Wire (-): Green/Red
Right Rear Speaker Wire (+): Green/Blue
Right Rear Speaker Wire (-): Green

The amp is located under the rear passenger side window. You need to remove the plastic side wall to expose it if you need access there. You can trace the wiring if needed.

Under the front bottom edge of the rear seat are clips holding the seat in place. Open the clips and the seat lifts off. You can then get to the amp as needed.

YOU WILL HAVE TO TRACE THE WIRES OUT, DO U HAVE A SEPERATE AMPLFIER? MANY OF THESE VANS DO, IF SO THAT IS THE PROBLEM.
HERE IS THE WIRING COLOR DIAGRAM FOR YOUR VAN
1998 Dodge Caravan Car Radio Stereo Audio Wiring Diagram
Car Radio Constant 12v+ Wire: Pink
Car Radio Switched 12v+ Wire: Red/White
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Black/Yellow
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Green
Left Front Speaker Negative Wire (-): Brown/Red
Right Front Speaker Positive Wire (+): Violet
Right Front Speaker Negative Wire (-): Blue/Red
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown/Yellow
Left Rear Speaker Negative Wire (-): Brown/Light Blue
Right Rear Speaker Positive Wire (+): Blue/Orange
Right Rear Speaker Negative Wire (-): Blue/White

I dont believe its used in your situation .

here is a rundown

Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: The radio harness does not provide a switched power source. Run a wire to the fusebox or ignition switch harness for switched power.
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue