K 1500 Suburban 4WD V8-5.3L VIN Z Flex Fuel (2003)
Ignition Switch Disarm Function
Perform the following steps in order to verify that the ignition disarm function operates:
1. Stay in the vehicle.
2. Place the system in the armed state.
3. Wait for the SECURITY telltale to turn off. The system is armed when the SECURITY telltale turns off.
4. Cycle the ignition switch from the LOCK position to the RUN position. Return the ignition switch to the LOCK position.
5. Open any door.
The system does not enter the alarm mode. The SECURITY telltale flashes. The flashing telltale indicates that the system has entered the ready-to-arm
state.
The Body Control Module (BCM) contains the theft deterrent system logic. The BCM reads the Passlock(TM) data from the Passlock(TM) sensor. If
the Passlock(TM) data is correct, the BCM will pass theft. The BCM will then transmit the fuel continue password to the VCM/PCM.
During the tamper mode the vehicle may start. The vehicle will then stall. If the BCM 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(TM) sensor sends a correct password to the BCM when the ignition is in the ON position, the BCM will send a fuel enable signal to
the VCM/PCM. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.
