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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Speedometer

The OSS voltage pulses are sent to the ECM to determine vehicle speed. The ECM sends the vehicle speed information to the BCM over the CAN bus. The BCM averages the vehicle speed calculations over time then sends the information to the I/P cluster over the Class II link every 100 ms.