K Yukon/Denali 4WD V8-5.7L VIN R (2000)
Alarm Module: Description and Operation
The EVO/Passlock (TM) module contains the theft deterrent system logic. The EVO/Passlock (TM) module reads the passlock (TM) data from the
passlock (TM) sensor. If the passlock (TM) data is correct, the EVO/Passlock (TM) module will pass theft. The EVO/Passlock (TM) module will then
transmit the code password to the VCM/PCM.
During the tamper mode the vehicle may start. The vehicle will quickly stall. If the EVO/Passlock (TM) module receives the wrong passlock (TM) data,
the VTD will immediately go into the tamper mode. The tamper mode will lock-out the vehicle fuel injectors for 10 minutes. The SECURITY indicator
will flash while the VTD is in the tamper mode.
If the passlock sensor sends a correct password to the EVO/Passlock module when the ignition is in the ON position, the EVO/Passlock module will send
a fuel enable signal to the VCM/PCM. The VCM/PCM will not disable the fuel due to any EVO/Passlock module message for the remainder of the
ignition cycle.
