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

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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 41 of 336 
Figure 10: GMLAN Node Communication States - COMM_KERNEL_ACTIVE 
5.2.1 Communications Initialization (COMM_INIT) State. 
This is an initialization state in which serial 
communications are not possible for diagnostics or normal communications. In this state a device initializes its 
CAN hardware and software variables used for communication. A node enters this state from either the 
ECU_READY or ECU_IN_STANDBY states if either of the following occurs: 
1. Node control logic evaluates a local input and determines that communications with other nodes are 
required. 
2. A bus wake-up is received. The wake-up may have been generated by a node on the vehicle or by an 
off-board tester. 
A node enters this state from the COMM_ACTIVE state upon termination of the Normal Comm Halted handler 
service, and a node also enters this state following the completion of a software reset. 
See GMW3104 and the GMLAN Handler specification (GMW3107) for more detail. 
5.2.2 Communications Enabled (COMM_ENABLED) State. 
The state of a node where all communication 
capabilities have been established. In the Communication Enabled state a node is capable of receiving and 
processing Virtual Network Management Frames (VNMF) (see GMW3104 for more information on VNMF) and 
receiving bus wake-ups. Diagnostic messages cannot be sent or received by a node in this state. See the 
COMM_ACTIVE state description section for further definition of diagnostic messages. 
A node remains in the