Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Transitioning the Onstar Control Unit to Market Mode

Transitioning the OnStar Control Unit to Market Mode

1. Turn the ignition switch ON (II).
2. Press and release the OnStar emergency button.
3. Press and release the OnStar services button.
4. Press and release the call answer/call end button.
5. Press and release the voice activated keypad button.
6. The system should respond by saying "Pardon". You can let the system time out to the ready mode (it will say "Good-bye"), or press the call answer/call end button to return the system to the ready mode.