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 
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Advisor can run a check.
See also:
How to Wear Safety Belts Properly
This section is only for people of adult size.
There are special things to know about safety belts and children. And there are
different rules for smaller children and infants. If a child will be r ...
Low-Beam Headlamps/Daytime Running Lamps (DRL), High-Beam Headlamps (Base)
1. From the back side of the headlamp assembly, remove the top cap to
replace the low-beam headlamp/DRL bulb.
2. From the back side of the headlamp assembly, remove the bottom cap to
repl ...
How to Check Automatic Transmission Fluid
Notice: Too much or too little fluid can damage the transmission. Too much can
mean that some of the fluid could come out and fall on hot engine parts or exhaust
system parts, starting a fire. Too ...