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

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Principles of Operation

PRINCIPLES OF OPERATION

The DSM is on the universal asynchronous receiver-transmitter (UART)-based protocol (UBP) communication network. The DSM controls the positioning and programming of the driver seat, the memory pedals and the memory exterior mirrors using hardwired circuits for all of the functions. The DSM is located under the driver seat.