Страница 1 мировой engineering стандарты общая спецификация

B1.2 Theft Deterrent EEPROM Access. 
Implementation of this device control allows a tool user to
read/modify EEPROM variables within the vehicle theft deterrent controller. This device control requires that
the theft deterrent controller be unlocked (reference security access service $27) at the time of the request for
activation of this device control. Upon receipt of a valid request for this device control, the device will start a 10
minute timer. When the 10 minute timer is expired, the device can read/modify EEPROM variables within the
theft deterrent controller using the diagnostic services $3B and $1A. A TesterPresent message is required to
keep this device control active.
If the device is secure at the time a request for this device control is received, the device shall reject the
request with a $7F $AE $31 response.
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GM WORLDWIDE ENGINEERING STANDARDS
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If a TesterPresent timeout occurs while this device control is active, the device shall terminate this device
control but no negative response is sent. The device will however send the unsolicited mode $20 response
message when the timeout occurs.
B2 CPID $FD
Table B2: Corporate CPID $FD Definition
Control
Byte #
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
1
Disable All
System
Outputs
1 = ENABLE
0 = DISABLE
ECU Reset
1 = ENABLE
0 = DISABLE
Learned
Source ID
Reset
1 = ENABLE
0 = DISABLE
2
3
4

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February 2010
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