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
Serial Data
The Catera uses International Standards Organization
(ISO) serial data and communicates with the scan tool on Data Link Connector
(DLC) pin-7. Most other GM OBD II vehicles use Class 2 serial data on DLC pin-2. Both the
Engine Control Module (ECM) and the Traction Control Module
(TCM) communicate with the scan tool by using the ISO serial data circuit.