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

Determining Factory Backup Unlocking Code For Secured Radio

If the security function is activated and the radio is disconnected from battery power, the radio will display LOC. The radio will not operate until the correct code is entered. If the customer code is lost or unavailable, refer to the Dealer Communications System Bulletin regarding unlock procedures, or call Chevrolet Technical Assistance Center.