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



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B1.1 Theft Deterrent Relearn. 
A scan tool implementation of this device control allows the user to request 
that the Powertrain or Engine Control Module (PCM/ECM) relearn the new password from the vehicle theft 
deterrent controller. Upon receipt of this device control, the PCM/ECM shall verify that none of the device 
control limits are exceeded and begin a ten minute timer. The scan tool is not required to remain connected for 
the next ten minutes. Therefore, the PCM software shall not expect a Mode $3E message to be sent every P3
C
ms. The PCM/ECM must remain powered (ignition must not be cycled to OFF) for the next ten minutes. When 
the ten minutes have expired, the PCM/ECM will be armed to learn the new password on the next powerup. 
This device control will only be allowed if all the following are TRUE: 
1. PCM/ECM is unsecured (unlocked) or reject with ($7F $AE $31) message. 
2. Engine is not running or reject with ($7F $AE $E3 $FE $01); $FE $01 is the limit exceeded. 
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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