KevinD92

I'm having a heck of a time getting my Z110BT properly functioning with my car (08 1LT). I have the OS2C harness (OnStar w/ no Bose). Can anybody give me a list of all the connections that need to be made so I can rewire it and know it's right? Thanks a bunch!

markcz

What isn't working?

Are you using stock amp/speakers or aftermarket?

The OS2C Instructions aren't the easiest to follow, but they do work.

KevinD92

I'm using the stock speakers and amp. I get a ton of alternator whine and static when the rear speakers are hooked up, but only static when they are disconnected. I want to double check my wiring first.

KevinD92

Anybody?

okie08vette

Maybe you need a ground loop isolator something like this.

http://www.bestbuy.com/site/metra-gr...&skuId=9855136

Not sure why it only happens on the rears, maybe swap the wiring for the front and rear and see if the problem moves, could be a bad HU.

Also make sure you have a good ground.

KevinD92

I've tried switching the wiring and the noise doesn't move to the front. Also, the rear speakers are fine as they make no noise with the stock headunit. I've tried grounding directly on the headunit and that didn't change anything either. I've tested the AVIC in another car and it works perfectly, so it's not a bad unit either!

okie08vette

Are the rear speaker wires run to close to any power wires? When you switched the outputs the rears were still noisy and fronts were not? If that's the case it has to be the wires or speakers IMO.

KevinD92

I don't think they are, but the previous owner did have the battery relocated into one of the trunk cubbys so maybe that's a possibility?

okie08vette

I would check that out for sure.

KevinD92

Nope, power wire isn't near the speaker wires.

okie08vette

Running out of ideas.

KevinD92

That makes two of us haha

okie08vette

There is a guy Dennis Drummer he runs Double D Mods and is a very smart guy and very willing to help even if you did not buy your stuff from him. I would give him a call and see what he recommends.
http://www.doubledmods.com/

markcz

Sooo....

1 - You're getting alternator whine, but only on the rear speakers, and it doesn't matter if front or rear HU output is feeding the rears.

2 - There is static through any connected speaker.

3 - HU itself is fine in another car.

The OS2C would be at the top of my list

KevinD92

Should I try and get a replacement or a whole different harness?

markcz

However you can get one, I'd try a different interface.

KevinD92

Which would you recommend?

markcz

I believe the RP5-GM11 is the latest model (verify that), but if it's the interface another OS2C would work also.