Which wires give constant, ignition and ground on a 2009 Buick LaCrosse?
On a 2009 Buick LaCrosse, take constant power from the Orange wire at the BCM plug C1, black 52-pin, left of the steering column, pin 52, ignition from the Pink wire at the BCM plug C1, black 52-pin, left of the steering column, pin 22, and ground to clean, bare body metal. Meter every wire first.
Meter every wire before you tap it. Colors change with trim and build date.
OBD-II port:Under the dash, driver sideBest power spot:BCM left of the columnSystem voltage:12VIgnition type:Key start (this page)
Where do I get constant, ignition and ground on a 2009 Buick LaCrosse?
Constant, ignition and accessory are all on one body control module plug left of the column.
Option 1 All the power
BCM plug C1
Black 52-pin plug on the body control module.
Constant
Orange
BCM plug C1, black 52-pin, left of the steering column, pin 5212V battery feed. Fuse it close to the tap.
Ignition
Pink
BCM plug C1, black 52-pin, left of the steering column, pin 22Hot with the key in run.
Accessory
Brown
BCM plug C1, black 52-pin, left of the steering column, pin 23Accessory.
Ground
Body ground
Bare metal under the dashNo ground wire in the guide. Never the battery negative post.
Starter is Yellow on pin 21, right next to ignition. Never tap it.
Option 2 Backup
Fuse tap
If you would rather not touch the BCM.
Ignition
Fuse tap
Interior fuse panelBackup: a slot that is dead off and hot on.
Use an add-a-fuse.
From Fortin's install guide for the 2005 to 2009 LaCrosse with a key (guide 93271).
Where are the turn signal, reverse and light wires on a 2009 Buick LaCrosse for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
Left turnNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Right turnNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Park lightNegative -Not yet checked
White
BCM plug C1, black 52-pin, left of the steering column, pin 10Ground when the parking lights are on. Meter it first.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
ReverseNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Dome lightNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Each chip shows the main insulation color with its stripe. Source: Fortin's install guide for the 2005 to 2009 LaCrosse with a key (guide 93271).
Where are the brake, door, speed and CAN wires on a 2009 Buick LaCrosse for advanced 360 multicam and video telematics installs?
Circuit
Wire color
Location and what it does
BrakePositive +Not yet checked
White
BCM plug C2, black 52-pin, left of the steering column, pin 30Positive with the pedal down.
CAN dataDataNot yet checked
Purple (GM Class 2 data)
OBD-II port, pin 2Single wire GM data. Never cut it or use it for power.
DoorsNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Parking brakeNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Vehicle speedNot foundNot yet checked
Not found
Not foundWe found no source for this wire.
Source: Fortin's install guide for the 2005 to 2009 LaCrosse with a key (guide 93271). Wires marked Not found were not in the guide.
Where are the fuse boxes and ground points on a 2009 Buick LaCrosse?
Left of the columnBCM plugs C1 and C2Constant, ignition, accessory, brake.
Interior fuse panelFuse tapBackup ignition.
Ground pointsBare body metalNever the battery negative post.
Locations from Fortin's install guide.
Where is the OBD-II port on a 2009 Buick LaCrosse?
OBD II
Diagnostic portOBD-II port: under the dash, driver sidePlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Which years share wiring with the 2009 Buick LaCrosse?
This page2009Buick LaCrosse with a key.
Same wiring2005, 2006, 2007, 2008Fortin uses the same guide for these years.
Newer LaCrosse2011 to 2016New body. Different guide. 2010 is not covered yet.
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This page covers the 2009 Buick LaCrosse sedan with a key start. In Canada this car was sold as the Buick Allure.
The wire colors come from Fortin's install guide, read wire by wire. Our own team has not yet metered these on a 2009 LaCrosse.
Written by API Signal, fleet GPS and camera installers for 35+ years across Georgia, South Carolina and North Carolina, installing every major telematics and camera brand. Every wire on this page lists its source.
Test every wire with a meter before you tap it
No wiring information is ever guaranteed. Colors and locations change with trim, options and build date, and the manufacturer can change them in the middle of a model year. We share this as a starting point for installers, and you are responsible for confirming every connection on the vehicle in front of you.
Common questions about 2009 Buick LaCrosse wiring
What wire is constant power on a 2009 Buick LaCrosse?
Orange at the BCM plug C1, black 52-pin, left of the steering column, pin 52. 12V battery feed. Meter it before you tap it.
What wire is ignition on a 2009 Buick LaCrosse?
Pink at the BCM plug C1, black 52-pin, left of the steering column, pin 22. Hot with the key in run. Meter it before you tap it.
Where is the brake wire on a 2009 Buick LaCrosse?
White (positive +) at the BCM plug C2, black 52-pin, left of the steering column, pin 30. Positive with the pedal down. Meter it before you tap it.
Which years share wiring with the 2009 Buick LaCrosse?
2005, 2006, 2007, 2008. Fortin uses the same guide for these years.
Help build this page
Had the panels off on one of these? Show the next installer what you found.
No one has sent photos for the 2009 Buick LaCrosse yet, so yours could be the first. Every photo, wire color and tip we use goes on this page with your name on it, and it saves the next installer time under the dash.
1. Snap it
The plugs, tap points, fuse boxes and ground points. Phone photos are fine.
2. Send it
Tap "Add yours" at the top of this page. Your tip and your photos go in the same box.
3. See your name on it
We check every tip, then post it here "Compliments of" you, by name.
Compliments of
The installers who helped build this page.
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Founding contributor spot: openThe first installer to confirm a wire or send photos for the 2009 Buick LaCrosse gets their name here, and it stays here.
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Every tip we use gets a creditThe wire you checked is marked "Checked on a vehicle, compliments of" you.
Want to be famous?
Your name, right on this page, for everyone who uses it to see. Add your tip and your photos in one box.
