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

Electrical Diagrams




Data Communication Schematics

Data Link Connector Power, Ground, and Low Speed GMLAN






Mid Speed GMLAN (KTA, UBT or UPH)






High Speed GMLAN (1 of 2)






High Speed GMLAN (2 of 2)






Chassis High Speed GMLAN






Communication Enable






Linear Interconnect Network (LIN) 1, 2, 3 and 4 Busses






Linear Interconnect Network (LIN) 6, 7, 8, 9, 10 and 11 Busses