GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 TrailBlazer - 4WD 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 Immobilizer Schematics
Figure 1:

Passlock Sensor - w/o BAE
Object Number: 1923798 Size: FS
Master Electrical Component List
Immobilizer Description and Operation North America, except Canada
Control Module References
Theft Deterrent Control Module, Alarm, and Hood Ajar Switch - UA2/BAE
Figure 2:

Theft Deterrent Control Module, Alarm, and Hood Ajar Switch - UA2/BAE
Object Number: 1923791 Size: FS
Master Electrical Component List
Immobilizer Description and Operation Canada, Europe, Middle East, and Asia
Control Module References
Intrusion and Indication Sensor Signals - UA2/BAE
Passlock Sensor - w/o BAE
Figure 3:

Intrusion and Indication Sensor Signals - UA2/BAE
Object Number: 1923795 Size: FS
Master Electrical Component List
Immobilizer Description and Operation Canada, Europe, Middle East, and Asia
Control Module References
Theft Deterrent Control Module, Alarm, and Hood Ajar Switch - UA2/BAE