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

Test A

PINPOINT TEST A: NO COMMUNICATION WITH THE DRIVER SEAT MODULE (DSM)


Test A1:






Test A2-A3:






Normal Operation
The DSM is powered by battery voltage from circuit 29-AH80 (OG/WH) and 30-AH80 (RD) and is supplied ground on circuit 31-AH80 (BK) and 91-AH80 (BN/WH).

Possible Causes
No communication with the driver seat module can be caused by:
- fuse(s).
- wiring, terminals, or connectors.
- a faulty DSM.