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

COMM_ KERNEL_ACTIVE
COMM_ENABLED
COMM_ACTIVE
B
U
S_
O
FF
_MO
N
IT
O
R
_A
C
TI
VE
[APPL_VN_ACTIVATION_ARRAY != 0 or
REMOTE_VN_ACTIVATION_ARRAY != 0]
 /
COMM_SHUTDOWN_STATUS := Disabled
COMM_ENABLED_TIMER = 0 and
[DLL_RESET_REQD = False ] / 
Generate
 REQ_COMM_SHUTDOWN_CONFIRM;
COMM_SHUTDOWN_STATUS := Enabled;
COMM_ENABLED_TIMER := 8 sec
NORM
_CO
M
M
_HAL
T_M
ONI
TOR_
ACTI
VE
VN
MF
_MO
N
IT
O
R
_A
C
TI
VE
AP
PL
_HI
_S
PD_RE
Q_
M
ONI
TOR_
ACTI
VE
COMM_ENABLED_TIMER = 0 and 
[DLL_RESET_REQD = True] /
BUS_OFF_TIMER := 0;
COMM_ENABLED_TIMER := 1 sec
COMMUNICATION_START_UP_LOGIC
--``,,``````,``,,``,,,`,`,`,,-`-`,,`,,`,`,,`---
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GM WORLDWIDE ENGINEERING STANDARDS 
GMW3110 
© Copyright 2010 General Motors All Rights Reserved 
February 2010 
Page 42 of 336 
5.2.3.1 Initially Active Diagnostic VN. 
GMW3104 defines initially active VNs as Virtual Networks which are 
automatically activated any time a bus wake-up is received. Initially active VNs remain active for a minimum of 
8 s following the wake-up, or 8 s after the transmission/reception of a VNMF with the bit set in the VNMF 
corresponding to the initially active VN. 
GMW3104 defines an initially active diagnostic VN. When the initially active diagnostic VN is active, the 
communications kernel enables the use of all diagnostic CAN Identifiers. 
Diagnostic CAN Identifiers include the following: 
1. A node
’s predefined diagnostic point-to-point request CAN Identifier (physical request CAN Identifier). 
2. The 
AllNodes
request CAN Identifier (functional request CAN Identifier) with a valid extended address 
(functional system address). See the section in this specification on diagnostic CAN Identifiers for more 
information on the 
All Nodes
request CAN Identifier and the use of extended addresses. 
3. A node
’s reserved SPS_PrimeReq CAN Identifier (this CAN Identifier is only valid for a SPS_TYPE_C 
ECU during a programming event. See the programming section of this specification for more details on 
the use of this type of CAN Identifier). 
4. A valid OBD/EOBD request CAN Identifier.