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 logical successor to CHARM, I recommend you try it!

Link: lemon-manuals.la

Electrical Diagrams




Data Communication Schematics

Low Speed GMLAN





Mid Speed GMLAN





High Speed GMLAN





Linear Interconnect Network (LIN)





Chassis Expansion Bus





Communication and Enable Wake-up Circuits