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
Information Bus: Description and Operation
There are two
data lines that can be accessed with a scan tool. The UART data line (800 CKT) allows the scan tool (when connected),
Powertrain Control Module,
(PCM) Instrument Cluster
(I/P), Diagnostic Energy Reserve Module
(DERM), and the Electronic Brake Control Module
(EBCM) to communicate via
serial data. The OBDII data line (1807 CKT) allows a scan tool to directly access the Powertrain Control Module to read emissions related information. A scan tool can gain access to both data lines through the Data Link Connector
(DLC). System operations can then be monitored or controlled for diagnostic purposes.