GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Tahoe - 4WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Theft Deterrent System Component Views
Figure 1:

Electronic Variable Orifice (EVO)/Passlock™ Module
Object Number: 277987 Size: MF
(1)EVO/Passlock™ Module
Figure 2:

Passlock Sensor
Object Number: 394392 Size: SH
(1)Passlock™ Lock Cylinder and Key Insert
(2)Passlock™ Sensor and Ignition Switch Location