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Second (most common) problem to typically hear is that sound isnt being distributed to all speakers. I've used these harnesses as well as the GMOS-01 harnesses over the years to today as I install radio's professionally. Cost is well over $100.As for the other people's negative reviews on this product, claiming the harnesses are defective. One they incorrectly wire up there constant, accessory wires incorrectly and wont power on. Obviously only getting half the audio and confusing the consumer and creating frustration thinking the harness is defective. More than likely it was human error to why they never worked for them.
Common do it yourself installer will have a headunit where they wont have the dual (front/rear) preouts on there headunit. I've always ordered the GMOS-01 and GMOS-04 harnesses on here as where if you go to a retail store to purchase it. As for the GMOS-04, obviously seeing you had 4 RCA hookups for your audio. From as I've seen in the shop I use to work in and from what I see when I get called out to a customers house for a onsite repair. With the GMOS-04, people tend to automatically declare there harness being defective, for a couple reasons. If you go low grade or not careful you can buy headunits that only have Rear/Subwoofer Preouts (no front) and thats it.
As well there is audio adjusting screws for not just the door chimes but for the output for the audio and the screws are plastic and extremely fragile.Best thing I recommend for this product is to take it to a professional installer.
Recieved part on time but package was opened and not new as advertized. Ended up throwing it out and hard wired my head unit in with out this adapter kit. Don't wast your money on this product.
It was easy enough to wire myself. It does not give reverse signal. Great harness for my 2003 GMC pickup truck. Metra gives great customer support via email. The reverse signal may have something to do with the fact my truck does not have navigation as a factory option. The illumination wire never gave me 12 volts no matter what I tried. Everything else in the harness works great. Especially the ability to lower the volume on the door chime.
I bought this product 2 weeks ago and it arrived defected. The company wouldn't take it back since it was a car auto part and they don't take back car auto parts even if there defected. I would suggest trying to find a different product.
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