2004 GMC Envoy

you dont NEED the brown hooked up..... other than that, yes....Kevin Gerry

Certified Electronics Technician

MECP First Class Installer

Owner/Installer

Classic Car Audio

since 1979

Actually you do require the Brown second accessory wire on those vehicles now. If not you will set a trouble code on some of these vehicles. It powers up a transmission module on these vehicles. The check engine light doesn't always come on at first, but will after a few minutes. It's not on all of them, but it is better to do it and not have it come back. I have seen quite a few already do this.sparky

sparkie wrote: Actually you do require the Brown second accessory wire on those vehicles now. If not you will set a trouble code on some of these vehicles. It powers up a transmission module on these vehicles. The check engine light doesn't always come on at first, but will after a few minutes. It's not on all of them, but it is better to do it and not have it come back. I have seen quite a few already do this.

Accually it's a secondary air something or other and it's only on the 06's so far. Shaughn Murley

Install Manager, Dealer Services

Visions Electronics

Red Deer, Alberta

I beg to differ. I have had to fix 3 Envoys for this so far and one was a 2004 and the others were 2005's.sparky

Some may not agree......But this is how I have hooked up since 2002.

Never had one come back...........And I always Power the Brown wire

Constant 12 volts	RED (2)	IGNITION SWITCH HARNESS
Ignition 12 volts	PINK	IGNITION SWITCH HARNESS
Starter	YELLOW	IGNITION SWITCH HARNESS

Ignition #2	WHITE	IGNITION SWITCH HARNESS
Ignition #3	ORANGE	IGNITION SWITCH HARNESS
Accessory	BROWN	IGNITION SWITCH HARNESS

MO

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