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Home >> Saturn >> 2002 >> L200 Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 277 (Data Link Communications) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Keyword Data Line >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Saturn LW300, 2003 Saturn LW200, 2003 Saturn L300, and 2003 Saturn L200. However, it is still accessible from the selected car via links, so may be relevant.

The keyword protocol utilizes a single wire bi-directional data line between the modules and the scan tool. The message structure is a request and response arrangement. Keyword serial data is used for scan tool diagnostics only. The modules do not exchange data on this circuit.

The following modules are connected to the keyword serial data circuit:

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