2005 Lacrosse wiring

[cornick]

Ahoy! I'm fairly new to wiring so please be nice.

Trying to wire a new head unit (no name brand) into a 2005 Buick Lacrosse but having a few issues.

1) I wired the yellow and red onto my orange based off what I was reading. And the deck turns on even if the car is off. Should I have not wired both? Based off this wiring diagram:

This is from the head unit:

2) I have additional wires that aren't allocated in the image above.

But I did find this link (https://pinoutguide.com/Car-Stereo-GMC-Opel-Chevrolet/Buick_2005-2008_Allure_La_pinout.shtml) that has some additional information but I don't know what "
Audio Common Signal (UE1)" or "Left Audio Signal (+) (UE1)" is. I'm guessing steering wheel controls?


I haven't connected ALL of the ones from the head unit yet as it's still a work in progress but figured I'd start with some issues I'm seeing so far.

Thanks for any suggestions, feedback you might have.

Click to read more...

 

[Firewalker]

Why didn't you just buy a wiring harness that would have connected directly to your oem harness?

 

[1aespinoza 10+ year member]

that has some additional information but I don't know what "
Audio Common Signal (UE1)" or "Left Audio Signal (+) (UE1)" is. I'm guessing steering wheel controls?

Judging by the 12pin harness pinout, I assume this 12pin harness is audio output to the amplifier. I like that they paired the wires in the pinout with ue1, u2k, et cetera. The UE1 pair I assume is for the warning chimes and call audio that plays exclusive to the driver's side. The only wire to use in that 12pin harness is U88.
Test B3 with a 12v light bulb or multimeter. Test for voltage with the key in accessory mode then in run mode. If it works, then connect the RED power wire to it.

 

[HardofWhoring]

No disconnect your yellow and red.
Yellow is 12v (straight to battery constant) - this goes to your vehicle's Orange.
Red is accessory wire, (its a switch that tells your head unit to turn on, when your vehicle is on/when you turn the key to on (and not start)) - this goes to an accessory wire. According to that pinout, this would go to your B3 PU "Radio on Signal"

 

[cornick]

Why didn't you just buy a wiring harness that would have connected directly to your oem harness?

Because I couldn't find one. Everything I saw matched the same exact connectors that came in the car.

 

[cornick]

No disconnect your yellow and red.
Yellow is 12v (straight to battery constant) - this goes to your vehicle's Orange.
Red is accessory wire, (its a switch that tells your head unit to turn on, when your vehicle is on/when you turn the key to on (and not start)) - this goes to an accessory wire. According to that pinout, this would go to your B3 PU "Radio on Signal"

Took them apart, thanks for that. Yellow to orange is done.

Still trying to sort out the purple because no matter what I did I couldn't get the unit to turn on, even with the car started.

 

[Firewalker]

https://www.sonicelectronix.com/ci95-2005-buick-lacrosse-wiring-harness-to-install-a-new-car-stereo.html?sort_order=price_asc

lots of options there and below at crutchfield.

Wiring Harnesses at Crutchfield

Shopping for Wiring Harnesses? Our Virginia-based experts love helping folks find the right gear. Get FREE 2-day shipping and free lifetime tech support with your order.

www.crutchfield.com