Hill descent control (green)

Illuminates continuously when HDC is selected and HDC operating conditions are met - i.e. vehicle speed below 30 mph (50 km/h). If the lamp flashes, HDC has been selected, but the operating condi ...

Cruise control (green)

Illuminates when cruise control is active.   ...

See also:

Traffic Options (US and Canada)
Read the following Options descriptions to understand how the XM NavTraffic™ operates. ...

Safety Belt Extender
If the vehicle's safety belt will fasten around you, you should use it. But if a safety belt is not long enough, your dealer will order you an extender. When you go in to order it, take the hea ...

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 v ...