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

Can Communication System Description

CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application.It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability.Modern vehicles are equipped with many electronic control units and each control unit shares information and links with other control units during operation (not independent).In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.Each control unit transmits/receives data but selectively reads required data only.

CAN Communications Unit For AWD Models:


















Input/Output Signal Chart Part 1:




Input/Output Signal Chart Part 2:




Type 17/Type 18/Type 19/Type 20/Type 21/Type 22/Type 23/Type 24











Input/Output Signal Chart Part 1:







Type 25/Type 26/Type 27/Type 28/Type 29/Type 30/Type 31/Type 32