GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Opel 🢒 2009 🢒 GT 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Interior Lights Dimming Schematics
Figure 1:

Dimmer Switch
Object Number: 2050066 Size: FS
Figure 2:

Lights
Object Number: 2050068 Size: FS