The exterior lamps turn off about 10 minutes after the ignition is turned off, if the parking lamps or headlamps have been manually left on. This protects against draining the battery. To restart the 10-minute timer, turn the exterior lamp control to the off position and then back to the parking lamp or headlamp position.
To keep the lamps on for more than 10 minutes, the ignition must be on or in ACC/ACCESSORY.
Battery Power Protection#03-06-03-003C: ACDelco Replacement Battery Warranty Procedures - (Apr 15, 2013) Low Voltage Battery
Subject:ACDelco® Replacement Battery Warranty ProceduresModels: 2014 and Prior GM Passenger Cars and TrucksAttention: “GM of Canada” and “IPC” Service Agents are not authorized to utilize this servicebulletin.This bulletin is being revised to add the 2010-2014 model years, update the Atte ...