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, press
, and an Advisor can run a check.
Connections
OnStar Additional InformationFront Side Door Wiring Harness Replacement
Preliminary Procedure
Remove the front side door inner panel trim. Refer to Front Side Door Trim
Replacement.
Front Side Door Wiring Harness
Warning: Unless directed otherwise, the ignition and start switch must be
in the OFF or LOCK position, and all electrical
loads must be OFF before ...
Hill and Mountain Roads
Driving on steep hills or through mountains is different than driving on flat
or rolling terrain. Tips for driving in these conditions include:
• Keep the vehicle serviced and in good shape.
• Check all fluid levels and brakes, tires, cooling system, and transmission.
• Shift to a lower g ...
Engine Coolant
The cooling system in the vehicle is filled with DEX-COOL engine coolant. This
coolant is designed to remain in the vehicle for 5 years or 240 000 km (150,000
mi), whichever occurs first.
The following explains the cooling system and how to check and add coolant when
it is low. If there is a ...