GM Service Manual Online
For 1990-2009 cars only

Tahoe Police Package and Special Service Package

The following exterior lighting features apply to vehicles first sold in the United States. The DRL and AHS must always remain fully functional for vehicles first sold in Canada.

Your vehicle is equipped with Daytime Running Lamps (DRL) and an Automated Headlamp System (AHS). The DRL and AHS can be turned off with the headlamp switch when the transmission is in PARK (P) and the engine is at idle.

Your vehicle may have been built with SEO 9G8, DRL and AHS disable. This feature turns off DRL and AHS and requires manual control of the exterior lighting. See your dealer to restore the DRL and AHS to normal operation.