TrailBlazer 2WD L6-4.2L VIN S (2003)
Door Switch: Description and Operation
DOOR AJAR SWITCHES
The CTD system uses the rear door ajar switches in the door lock assemblies as one method to activate the alarm. The body control module (BCM)
monitors rear door ajar switches via a discrete input from each rear passenger door ajar switch, if the BCM receives a ground signal from a rear
passenger door ajar switch when the CTD system is armed, the BCM activates the alarm.
The CTD system uses the LH front door ajar switch as one method to activate the alarm. The driver door module (DDM) monitors the LH door ajar
switch via a discreet input from the door ajar switch, if the DDM receives a ground signal from the LH door ajar switch when the CTD system is armed
the message is communicated through the serial data circuit to the BCM and the alarm is activated.
The CTD system uses the RH front door ajar switch as one method to activate the alarm. The passenger door module (PDM) monitors the RH door ajar
switch via a discreet input from the door ajar switch, if the PDM receives a ground signal from the RH door ajar switch when the CTD system is armed
the message is communicated through the serial data circuit to the BCM and the alarm is activated.
The CTD system uses the rear compartment liftgate/liftglass ajar switchs as one method to activate the alarm. The liftgate module (LGM) monitors the
liftgate and liftglass ajar switch via a discreet input from the ajar switch, if the LGM receives a ground signal from the liftgate or liftglass ajar switch
when the CTD system is armed the message is communicated through the serial data circuit to the BCM and the alarm is activated.
