Doing this- can cause issues on these modern cars.
* unplugged battery while running to test alternator and it works, car doesn't die.
The Body Control Module (BCM) may be damaged if the module is supplied with battery power when the ground path is removed on some vehicles. The negative battery cable should be removed first before removing a BCM ground on 2006-2008 Monte Carlo; 2006-2011 Lucerne, DTS; 2006-2012 Impala; 2007-2009 SRX, Equinox, Torrent; 2007-2010 OUTLOOK; 2007-2012 Enclave, Acadia, Silverado, Sierra, Avalanche, Suburban, Tahoe, Yukon, Yukon XL, Escalade; 2008-2010 VUE, H2; 2008-2012 CTS, Express, Savana and Traverse models.
When the BCM is powered up (key in the Accessory or Run position) with the ground ring terminal removed or loose, the BCM will attempt to find a different ground path to the vehicle. This different ground path attempt may cause internal damage to the BCM.
The following systems controlled by the BCM may be inoperative or work intermittently because of an internally damaged BCM caused by a lifted BCM ground:
•Interior lighting (will remain on or will not work)
•Exterior lighting (will remain on or will not work)
•Remote Keyless Entry
•Power windows and mirrors
•Remote vehicle start
Refer to Bulletin #07-08-47-004D for additional information. Models listed in the bulletin and not referenced above have the BCM ground wires going directly from the BCM to the ground ring terminal.
2010 FWD LT1-Gold Mist Metallic- seats 8.
Build Date- July 31, 2009-2nd day of Spring Hill 2010 production.
2013 Equinox 3.6L - 88,000
2010 Traverse 3.6L- 153,000
2003 Trailblazer 4.2L- 181,500