Operation CHARM: Car repair manuals for everyone.

Information Bus




Data Communication Schematics

Low Speed Bus (1 of 3)





Low Speed Bus (2of 3)





Low Speed Bus (3 of 3)





High Speed Bus (1 of 6) (except MEX or HP2)





High Speed Bus (2 of 6) (except MEX or HP2)





High Speed Bus (3 of 6) (Diesel)





High Speed Bus (4 of 6) (MEX)





High Speed Bus (5 of 6) (HP2)





High Speed Bus (6 of 6) (HP2)





HTE GMLAN (LGH or LML)





Serial Data Communication Enable





Accessory Wakeup and Local Interconnect Network (LIN)





Powertrain Expansion Bus (HP2)





Serial Data Gateway (SDG) Module (HP2)