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Home >> Buick >> 2003 >> LeSabre Custom, 4T65E/MN3 >> Repair and Diagnosis >> External Pages >> Different car >> Section 1284 (Data Link Communication System) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Class 2 Device >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. Connecting a scan tool to the data link connector (DLC) allows communication with the modules for diagnostic purposes.

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