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Home >> Saturn >> 2003 >> Ion 1 Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 643 (Computer/Integrating Systems) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Class 2 Device >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2005 Saturn Ion Red Line, 2005 Saturn Ion 3, 2005 Saturn Ion 2, and 2005 Saturn Ion 1. 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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