General Specification Electrical Function gmw3110 General Motors Local Area Network Enhanced Diagnostic Test Mode Specification

5.1 Interaction between Diagnostics and Node Management. 
Each time a wake-up occurs (independent of 
the wake-up mechanism), a node shall transition to a communications state where it can receive, process, and 
respond to any diagnostic message. 
Note:
Reference the wake-up requirements section of this specification for information relative to the maximum 
time allowed after a wake-up until the node is capable of receiving, processing and responding to diagnostic 
messages. 
A node shall remain capable of receiving, processing, and responding to diagnostic messages for a minimum 
of 8 s following the wake-up. 
Note:
This assumes the node is powered at the time of wake-up and does not lose power during the 8 s 
interval. 
Once diagnostic communication has started (i.e., at least one diagnostic message has been received, or is in 
the process of being received within the first 8 s following a wake-up), the node shall remain capable of 
receiving, processing, and responding to diagnostic messages for a minimum of 8 s following the completion of 
the last diagnostic service. 
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 40 of 336 
Note:
This assumes that the node remains powered. Refer to paragraph 5.2.4 for requirements on how to 
determine when a diagnostic service is completed. A node which is in the process of receiving a multi-frame 
diagnostic message shall be capable of receiving the complete message without the possibility of remoting off. 
This can be accomplished via the use of the network layer service primitives which provide first frame 
indications, error indications, and an indication of the reception of a complete message. 
If Diagnostic Mode is activated during the course of diagnostic communication, a node shall be capable of 
receiving, processing and responding to diagnostic messages for a minimum of 8 s following the termination of 
Diagnostic Mode. 
Note:
Reference the Terms and Definitions section of this specification for a detailed definition of diagnostic 
mode. 
A GMLAN node that does not support VNMFs shall be capable of receiving, processing, and responding to 
diagnostic messages any time that the node would otherwise be communications capable. If diagnostic 
functionality is required at a time when a node would not otherwise be communicating (and can be designed 
such that diagnostic communications can take place), then the circumstances under which diagnostics can be 
performed shall be documented in a CTS, SSTS or applicable diagnostic specification referenced by a CTS or 
SSTS.