Needed to upgrade the stock head unit to something that could play mp3's or take an aux unit.

Anyway - read pages and pages on here, decided quick n' cheap plug n' play swap with a Blaupunkt MP 37 London - $75 shipped off of Ebay.

Also picked up the Metra 40-EU55 Antenna adaptor.

Got both on the same day - ran around to about 3 Wally-marts before I found one that had the removal tools in stock.

Got the factory head unit out no problem.

As for the alleged Plug n' Play with the MP37 - not so much:

Plugged in - nothing, had to plug in the antenna for the unit to work at all - WTF? why does the antenna have to be plugged in? Doesn't make sense.

Anyway, got the unit to fire up, goes straight to "TELEPHONE" and won't do anything.

Ok, back to the forum, found that I had to cut the Telephone mute wire off on the factory harness - felt like MacGruber cutting the blue bomb wire - but got it figured out.

So now the unit works, sort of, think the power wires (constant and switched) are messed up, (unit turns on with the key off) - so do I need to switch those? (red & yellow)

And the big question: On the Metra 40-EU55 Antenna adaptor, there is a blue wire that looks like it goes somewhere - anyone know where? Anyone? Bueller?

 

My only guess is that you have a missing ground on the unit and it's getting it's ground from the antenna cable shield.

Other than that, you'll need to wait for one of the big-time audio guys on here to help you.

But, um, you know we DO have a forum here just for questions like this: Audio, Video and Electronics