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:
Compass Calibration Procedure
1. Before calibrating the compass, make sure the compass zone is set to the variance zone in which the vehicle is located.
See “Compass Variance (Zone) Procedure” earlier in this section.
Do not ...
Rear Window Wiper/Washer
The rear wiper and rear wash button is located on the instrument panel below the climate control system.
(Rear Wiper): Press to turn the rear wiper on and off. The wiper speed cannot be changed.
( ...
Electric Trailer Brake Control Wiring Provisions
These wiring provisions for an electric trailer brake controller are included with the vehicle as part of the trailer wiring package.
The instrument panel contains blunt cut wires behind the steering ...