See also:

Using the Re-dial Command
1. Press and hold for two seconds. The system responds with “Ready” followed by a tone. 2. After the tone, say “Re-dial”. The system responds with “Re-dial using <phone name>� ...

Add-on Electrical Equipment
The OnStar system is integrated into the electrical architecture of the vehicle. Do not add any electrical equipment. See Add-On Electrical Equipment. Added electrical equipment may interfer ...

Underbody Maintenance
Use plain water to flush dirt and debris from the vehicle's underbody. Your dealer or an underbody car washing system can do this. If not removed, rust and corrosion can develop. ...