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Home >> Cadillac >> 2001 >> DeVille Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> Body Control Modules >> System Tests >> Test B: Scan Tool Does Not Communicate With Class 2 Device >> Circuit Description
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Circuit Description

Modules are connected along class 2 serial data line monitor serial data communications during normal vehicle operation. Operating information and commands are exchanged between modules. Connecting scan tool to Data Link Connector (DLC) allows communication with modules for diagnostics. Regular Production Option (RPO) codes are used to define between vehicle options and testing procedures. See REGULAR PRODUCTION OPTION CODES  under DESCRIPTION for location and definitions of RPO codes.

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