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)

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Fuel Level Sensing

The BCM performs the following functions:
^ Calculates the fuel level
^ Sends a serial data message to the instrument cluster indicating the fuel level

The fuel level is calculated as a ratiometric reading between the fuel level sensor and an Ignition 1 reference voltage. By using this method, changes in system voltage will have no effect on the fuel level. The BCM sends changes in fuel level information to the instrument cluster over the SPI serial data bus.