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 X: No Communication With The Restraints Control Module

X1:






X1 - X3:






X3 - X4:






X5 - X6:






Normal Operation
The scan tool communicates with the Restraints Control Module (RCM) monitors through the data link connector pin 7,70 (LB/WH).

Possible Causes
A no communication with the RCM fault can be caused by:
^ Wiring, terminals, or connectors.
^ A faulty Data Link Connector (DLC).
^ RCM is faulted.