The Suburban full size sport utility comes standard with daytime running lights, four wheel anti-lock brakes and a PassLock Theft-Deterrent System. The PassLock Theft-Deterrent System disables the vehicle from being started for 10 minutes if the correct key is not used. The Suburban is available in half-ton and three-quarter ton versions in either 2WD or 4WD. The Suburban is the only vehicle in its class to offer an optional diesel engine. Also available is the optional Homelink Transmitter. The standard Push Button Electronic Active Transfer Case is available in the 4WD models and will automatically engage 4WD when needed. It will revert back to 2WD for better economy when the extra traction is no longer needed.