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

System Functions

System Functions
The MRS4RD control unit has to perform the following functions:
^ Crash detection and calculation of deployment timing
^ Activation of deployment output stages
^ Documentation of time sequence of actuator deployment
^ Predrive check
^ Cyclic monitoring
^ Indication of system readiness
^ Indication and storage of faults
^ Output of fault data (diagnosis)
^ Output of crash signal for other members of the communication network
^ Activation of the warning lamp if the passenger airbag is deactivated