Section 25 (Remote Keyless Entry Systems): Operation
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2000 GMC Yukon XL, 2000 GMC Yukon, 2000 GMC Sierra, 2000 Chevrolet Tahoe, and 2000 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.
When UNLOCK button is depressed once, only driver door is unlocked. Parking lights will flash and interior lights will turn on for 40 seconds. When UNLOCK button is depressed a second time within 5 seconds, remaining doors including liftgate or cargo doors on utility vehicles (if equipped) are unlocked.
When LOCK button is depressed, all doors and liftgate or cargo doors on utility vehicles (if equipped) lock. When LOCK button is depressed twice, horn sounds to verify that doors locked.
When button with horn symbol is pressed, horns sounds and head lights and park lights will flash for up to 30 seconds. Pressing horn button again or starting vehicle will turn horn and lights off.