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8.8.3 Positive Response Message Definition. 
Table 103 indicates the separate message structures for the
positive responses relating to the requestSeed and sendKey request levels.
Table 103: SecurityAccess Positive Response
Data Byte
Parameter Name
Cvt Hex Value Mnemonic
#1
Security Access Positive Response Service Id
M
67
SIDPR
#2
RespLevel = [
requestSeed
sendKey ]
M
xx
xx + 1
RPLEV_
RSD
SK
#3
#4
SecuritySeed = [
HighByte
LowByte ]
M
4
0000 thru
FFFE
SS_
HB
LB

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Where:
M
4 
= Mandatory if request level is requestSeed. Not present if request level is sendKey.
8.8.3.1 Positive Response Message Data Parameter Definition (Table 104).
Table 104: Response Message Data Parameter Definition
Definition
RespLevel
This byte is an echo of the sub-parameter from the request message.
SecuritySeed (high and low bytes)
The seed parameter is a data value sent by the ECU and is used by the tester when calculating the key
needed to access security. The SecuritySeed data bytes are only present in the response message if the
request message was sent with the sub-parameter set to requestSeed.
8.8.4 Supported Negative Response Codes. 
The following negative response codes shall be implemented
for this service. The circumstances under which each response code would occur are documented in
Table 105.