Diagnostics
OnStar Vehicle Diagnostics will perform a vehicle check every month. It will check the engine, transmission, antilock brakes, and major vehicle systems. It also checks the tire pressures, if the vehicle is equipped with the Tire Pressure Monitoring System. If a diagnostics check is needed between e-mails, push 
, and an Advisor can run a check.
See also:
Weight of the Trailer Tongue
The tongue load (A) of any trailer is an important weight to measure because
it affects the total gross weight of the vehicle. The Gross Vehicle Weight (GVW)
includes the curb weight of the vehicl ...
Cruise Control
ON/OFF CRUISE : Press to turn the
cruise control system on and off.
CANCEL : Press to disengage cruise
control without erasing the set speed from memory.
RES/+: Move the thumbwheel up to make ...
When to Inspect the Engine Air Cleaner/Filter
Inspect or replace the air cleaner/ filter at the scheduled maintenance intervals.
See Maintenance Schedule on page 11‑3 for more information. If driving in dusty/dirty
conditions, inspect t ...