Instrument Dimmer

Fuse 16 (C0589) also provides a feed to the following on RO wires:

The instrument pack (C0233). The rear fog lamp switch (C0064). The radio remote display/clock (C0241). The rear screen washer switch (C0073). The rear screen wiper switch (C0079).

All the above are earthed on B wires.

Instrument Dimmer

The instrument dimmer is a rotary potentiometer mounted on the fascia below the instrument pack. When the lighting switch is turned to the side or headlamp position, current flows across the switch (C0041) to fuse C (C1875) on an RW wire. Fuse C (C1875) is connected to the instrument dimmer (C0201) by an RB wire. The dimmer (C0201) provides a feed to all the switches and controls mentioned previously on RO wires.

The switch (C0201) also contains a tell-tale LED, which is earthed on a B wire.