Diagnosing your Chevrolet SSR requires the right tools and knowledge, especially when it comes to network communication. For owners of the Chevy SSR, particularly models from 2003 to 2006, understanding how to use a Bosch Gm Scan Tool, like the Tech2, is crucial for effective vehicle maintenance and repair. This guide clarifies the nuances of using your Bosch GM scan tool with different SSR model years, focusing on the CANdi adapter and Class 2 network systems.
For owners of the 2005 and 2006 Chevrolet SSR models, it’s important to note the necessity of the CANdi (Controller Area Network diagnostic interface) adapter when using a Bosch GM scan tool. These models utilize a CAN network for communication between the Engine Control Module (ECM) and Transmission Control Module (TCM). To effectively communicate with these modules using your Bosch GM scan tool, the CANdi adapter must be connected. A flashing LED on the CANdi adapter indicates successful communication with the CAN modules, while a solid LED signals a lack of communication.
The “comb,” technically known as a jumper or shunt, is relevant for Class 2 network modules, primarily in earlier models and for certain systems in later models. A Bosch GM scan tool communicates with all modules on the Class 2 network through terminal #2 of the DLC (Data Link Connector). This communication line is also linked to the Remote Keyless Entry module. While it might seem possible to communicate with the keyless entry module via this connection, its active status display may only be momentary, appearing right after keyfob use before reverting to an inactive state. Critically, the key fob’s functionality relies on signals transmitted from the keyless module to the Body Control Module (BCM) via the Class 2 network. If the comb is removed, disrupting the Class 2 network, signals from the keyless module cannot reach the BCM, thus preventing door locks and cargo cover operation through the key fob. Furthermore, removing the comb will impede communication with other modules that operate on the Class 2 network, as they will be isolated from the Bosch GM scan tool.
For 2005 and 2006 SSR models, the situation is slightly different. While the principles regarding Class 2 network modules remain consistent, the ECM and TCM communicate with the Bosch GM scan tool through the CAN network. These CAN modules connect to the scan tool via pins 6 and 14 of the DLC connector. Consequently, even with the comb removed on a 2005 or 2006 SSR, communication with the ECM and TCM is still possible using a Bosch GM scan tool equipped with a CANdi adapter. However, communication with other modules, which remain on the Class 2 network, will be affected in the same way as described for earlier models when the comb is removed.
It’s also worth noting that the diagnostic system test, a feature often available on Bosch GM scan tools, might not be an option for 2005 and 2006 models. This is because the diagnostic circuit check is primarily designed for Class 2 network information, and GM might have phased out this selection in newer models. However, it has been confirmed that the diagnostic circuit check selection is indeed available on 2005 models, clarifying earlier uncertainties.
Therefore, if you are experiencing communication issues with your Bosch GM scan tool on your Chevy SSR, especially a 2005 or 2006 model, ensure that you are using the CANdi adapter. If you’ve identified a communication problem, double-check the CANdi adapter connection to establish proper communication with all modules. Keep in mind that functions like message monitoring and DTC (Diagnostic Trouble Code) checks are tailored for the Class 2 network and might not display ECM and TCM information on your 2005 SSR model, as these modules operate on the CAN network. Understanding these network distinctions is key to effectively using your Bosch GM scan tool for comprehensive Chevrolet SSR diagnostics.
