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Which wires give constant, ignition and ground on a 2012 Chevrolet Express / GMC Savana?
On a 2012 Chevrolet Express / GMC Savana, take constant power from the Red/White wire at the body fuse block connector X1, pin G4, ignition from the Brown wire at the body fuse block connector X1, pin D5, and ground to clean, bare body metal. Meter every wire first.
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 truck in front of you.
This page covers the 2012 Chevrolet Express and GMC Savana, cargo, passenger and cutaway. The Express and Savana share the same wiring.
We did not find a separate 2012 source. GM's 2011 and 2013 manuals on either side match, so their colors are used here. Our own team has not yet metered these on a 2012 van, and each row says so.
OBD-II portUnder the driver dash
Best power spotFuse block under driver seat
System voltage12V
Ignition typeKey
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Where do I get constant, ignition and ground on a 2012 Chevrolet Express / GMC Savana?
Take constant, ignition and ground from the same area. On 2008 to 2015 vans, GM's own manual gives the power wires at the body fuse block under the driver seat, and ignition and accessory are at the ignition switch.
Option 1 GM wiring
Body fuse block under the driver seat
GM's light gray 56-way connector X1 on the body fuse block, under the driver seat. GM puts the main power feed at the side of this block.
Constant
Red/White
Body fuse block connector X1, pin G4Battery feed (circuit 340). GM's upfitter electrical manual for full-size vans, 2011 and 2013.
Ignition
Brown
Body fuse block connector X1, pin D5Ignition (circuit 141). GM also lists fuse HVAC1 F14 (20A) as an ignition point.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post.
The 2013 to 2014 Savana sheet also lists four Red/White 10A constants on the BCM black plug, pins 1 to 4, and a Red/Black 125A main feed at this fuse box.
Option 2 Ignition switch
Ignition switch, black 6-pin
Steering column. Key start.
Constant
Not on this plug
Use the fuse block (Option 1)The ignition switch plug has no constant listed.
Ignition
Pink
Ignition switch black 6-pin plug, pin 2Hot in run and start. From the iDatalink guide for 2008 to 2014 vans.
Ground
Body ground
Body metal under the dashClean, bare metal only. Never the battery negative post.
Accessory
Brown
Ignition switch black 6-pin plug, pin 3Hot in accessory and run.
Pin 5 (Pink) is the Passlock signal. Do not use it for power.
Power wires from GM's upfitter electrical manual for full-size vans (2011 and 2013, fetched twice), the iDatalink guide for 2008 to 2014 vans, and a 2013 Savana sheet on the12volt.
What are the turn signal, reverse and light wires on a 2012 Chevrolet Express / GMC Savana?
Circuit
Wire color
Location and what it does
Left turnPositive +Not yet checked
Yellow (rear)
Body fuse block connector X1, pin C1Left rear turn (circuit 618). GM's upfitter electrical manual for full-size vans. Front turn wires were not found.
Body fuse block connector X1, pin B4 (front park lamps); pin A5 (park lamp control)Brown is circuit 2309, Dark Blue circuit 45.
HeadlightNot foundNot yet checked
Not found
Not foundWe found no headlight wire for 2008 to 2015.
ReversePolarity: meter itNot yet checked
Dark Blue (relay)
Light Green (cutaway)
Body fuse block X1, pin K8 (backup relay); pin J5 on cutawaysDark Blue is the backup relay circuit 38; Light Green (circuit 1624) is the backup wire on cutaways and trailer-ready vans.
Dome lightPolarity: meter itNot yet checked
Gray/Black
Body fuse block X1, pin K7Courtesy lamp (circuit 690), on vans with the YF2 or YF7 upfit package only.
Each chip shows the main insulation color with its stripe. Each source is named on its row.
Where are the brake, door, speed and CAN wires on a 2012 Chevrolet Express / GMC Savana?
Circuit
Wire color
Location and what it does
BrakePolarity: meter itNot yet checked
Light Blue (body side)
Cutaway rear lighting connector X405 (black 10-way), pin CCenter high stop lamp, cutaways only (circuit 1320; the chassis side is White). A brake wire for cargo and passenger vans was not found.
Driver doorNegative -Not yet checked
Tan
Gray/Black (ajar)
Driver door connector X500 (black 40-way), pin A1 (open) and B3 (ajar)Door switch circuits 126 and 745. GM's upfitter electrical manual for full-size vans.
Passenger doorNegative -Not yet checked
Tan/White (ajar)
Light Green (open)
Passenger door connector X600 (gray 22-way), pin A8 (ajar) and B8 (open)Circuits 746 and 1177.
Lock / unlockNegative -Not yet checked
Pink/Black (lock)
Orange/Black (unlock)
Driver door connector X500, pin B2 (lock switch), pin B1 (unlock switch)Lock switch circuits 780 and 781. The same colors appear on the 2016 BCM.
In parkPolarity: meter itNot yet checked
Tan/White
Steering column connector X200, pin D4Park/neutral (circuit 816). GM says it goes to battery voltage with the ignition on and the van in park.
Parking brakeNot foundNot yet checked
Not found
Not foundWe found no parking brake wire for 2008 to 2015.
Vehicle speedNot foundNot yet checked
Not found
Not foundWe found no speed or tach wire for 2008 to 2015.
CAN busDataNot yet checked
Dark Green (GMLAN)
Steering column connector X200, pin E13; also Green on the PK3 black 5-pin, pin 4GM's single-wire low-speed data (circuit 5060). Never cut or splice it.
Sources: GM's upfitter electrical manual for full-size vans for 2011 and 2013 (OEM), the iDatalink install guide for 2008 to 2014 vans, and a 2013 to 2014 Savana sheet on the12volt. Front turns, headlight, parking brake, hazard, speed and tach were not found for 2008 to 2015.
Which years share wiring with the 2012 Chevrolet Express / GMC Savana?
This page2012Carried from GM manuals for 2011 and 2013.
Same wiring2008, 2009, 2010, 2011, 2013, 2014 and 2015GM's 2011 and 2013 manuals print the same colors, and the iDatalink guide covers 2008 to 2014 on one page.
Not this page2007 and older, 2016 and newerOlder vans use a different BCM layout, and 2016 and newer vans have a sheet of their own. Those years have their own pages.
Where are the fuse boxes and ground points on a 2012 Chevrolet Express / GMC Savana?
Under the driver seatBody fuse blockThe body fuse block sits under the driver seat, with the main power feed at its side.
Under the hoodUnderhood fuse blockWe did not find a fuse map we trust for this van. Check the lid.
Ground pointsClean body metalWe did not find a published ground point. Use clean, bare body metal, never the battery negative post.
Our team has not yet checked the fuse boxes on a van.
Where is the OBD-II port on a 2012 Chevrolet Express / GMC Savana?
OBD II
Diagnostic portOBD-II port: under the driver dashPlug-in GPS trackers and OBD harnesses connect here. Check the port before you plan the install.
Common questions about 2012 Chevrolet Express / GMC Savana wiring
What wire is constant power on a 2012 Chevrolet Express / GMC Savana?
Red/White at the body fuse block connector X1, pin G4. Battery feed (circuit 340). Meter it before you tap it.
What wire is ignition on a 2012 Chevrolet Express / GMC Savana?
Brown at the body fuse block connector X1, pin D5. Ignition (circuit 141). Meter it before you tap it.
Where is the reverse wire on a 2012 Chevrolet Express / GMC Savana?
Dark Blue (relay) and Light Green (cutaway) at the body fuse block X1, pin K8 (backup relay); pin J5 on cutaways. Dark Blue is the backup relay circuit 38; Light Green (circuit 1624) is the backup wire on cutaways and trailer-ready vans. Meter it before you tap it.
Where is the brake wire on a 2012 Chevrolet Express / GMC Savana?
Light Blue (body side) at the cutaway rear lighting connector X405 (black 10-way), pin C. Center high stop lamp, cutaways only (circuit 1320; the chassis side is White). Meter it before you tap it.
Where is the CAN bus on a 2012 Chevrolet Express / GMC Savana?
Dark Green (GMLAN) at the steering column connector X200, pin E13; also Green on the PK3 black 5-pin, pin 4. GM's single-wire low-speed data (circuit 5060).
Which years share wiring with the 2012 Chevrolet Express / GMC Savana?
2008, 2009, 2010, 2011, 2013, 2014 and 2015. GM's 2011 and 2013 manuals print the same colors, and the iDatalink guide covers 2008 to 2014 on one page.
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