* Instrument Panel Dimmer: The brightness of the instrument cluster is controlled by a rotary dial or knob, typically located on the instrument panel itself, often near the steering column.
* Overhead Console Lights: If your Caravan has an overhead console with map lights, those lights usually have their own switch with varying levels of brightness, or they may simply have an on/off switch.
In short, you'll need to look for individual controls near the lights themselves, rather than a central dimmer switch.