Module Substitution Deterrence w/UA2

Module substitution deterrence is on some EXPORT vehicles and is an internal function of the theft deterrent control module. Module substitution deterrence will disable starting of the vehicle when a loss of battery power has been restored. This can be do to, the vehicles battery becoming discharged or the battery power being removed from the vehicle theft deterrent (VTD) system. The theft deterrent control module performs one of the following functions:

IMPORTANT: If the ignition is cycled OFF before the VIN timer has timed out, on the next ignition cycle ON the timer will begin at the original programmed time.
• After a loss of battery power has been restored the theft deterrent control module will perform a check on the stored vehicle identification number (VIN). If the VIN is CORRECT, the theft deterrent control module will run the VIN timer for a programmable length of time, typically 10 minutes. If there is a loss of battery power and it is necessary to jump start the vehicle, refer to Jump Starting in Case of Emergency . Before attempting to start the vehicle the ignition must be in the ON position for the duration of the VIN timer, the security indicator will be ON steady. After the VIN timer has timed out, the security indicator will turn OFF. The vehicle can now be started.
• After a loss of battery power has been restored the theft deterrent control module will perform a check on the stored VIN. If the VIN is INCORRECT, the theft deterrent control module will send the fuel disable password to the engine control module (ECM) via the serial data circuit. The VTD system considers this to be a tamper and will not allow the vehicle to start. The VTD system will command the security indicator to flash.