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GM WORLDWIDE ENGINEERING STANDARDS
GMW3110
Table 99: Node Security Status
Manfacturers Enable Counter (MEC)
Vulnerability Flag
Security Status
$00
$FF
Unlocked (Unsecured) 
Note 1
$00
! = $FF
Locked (Secured)

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> $00
$FF
Unlocked (Unsecured) 
Note 1
> $00
! = $FF
Unlocked (Unsecured) 
Note 1
Note 1: 
Requests for secured services, paramaters, or functions are rejected ($7F $XX $31) if no request for seed.
8.8.2 Request Message Definition. 
Table 100 indicates the structures of the valid request messages for this
service.
Table 100: SecurityAccess Request Message
Data Byte
Parameter Name
Cvt Hex Value Mnemonic
#1
Security Access Request Service Id
M
27
SIDRQ
#2
sub-function = [
requestSeed
sendKey ]
M
1
xx
xx + 1
LEV_
RSD
SK
#3
#4
SecurityKey = [
HighByte
LowByte ]
M
2
yy
zz
SECKEY_
KEYHB
KEYLB
Where:
M
1
= The value represented by “xx” must be an odd number.
M
2
= Mandatory if request $Level is sendKey. Not present if request level is requestSeed
8.8.2.1 Request Message Sub-function Parameter $Level (LEV_) Definition. 
The sub-parameter used in
the request message of the SecurityAccess service indicates to the node the step in progress for this service.
The sub-parameters defined as valid for the request message of this service are indicated in Table 101.
The values of the parameter seed are not defined in this document except for the value $0000 which indicates
to the tester that the node is not locked, and $FFFF which shall not be used because this value may occur if
the Nodes memory has been erased.
The values of the parameter key are not defined in this document.
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