Scan Tool Does Not Communicate with Class 2 Device. Chevrolet Captiva 2008

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2008 🢒 Captiva 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Scan Tool Does Not Communicate with Class 2 Device

Circuit Description

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.

Diagnostic Aids

The following conditions will cause a total loss of class 2 serial data communication:

•	A class 2 serial data circuit shorted to ground.

•	A class 2 serial data circuit shorted to voltage.

•	An internal condition within a module or connector on the class 2 serial data circuit, that causes a short to voltage or ground to the class 2 serial data circuit.