INTERIOR ILLUMINATION
DESCRIPTION
General
Instruments, controls and switch graphics are automatically illuminated when the side lamps or headlamps are switched on. The brightness of the instrument pack illumination can be adjusted using an instrument illumination dimmer.
OPERATION
Power supplies
Fusible link 1 (C0570) in the under bonnet fuse box supplies a permanent feed to the lighting switch (C0041) on a N wire.
General
When the lighting switch is in the side lamps or headlamps position, a feed is connected from the lighting switch (C0041) to fuse 8 (C0582) of the passenger compartment fuse box on a R wire. Fuse 8 (C0581 and C0590) feeds all of the interior illumination bulbs/ LED’s and the instrument illumination dimmer (C0201) on RB wires. On EM-CVT models, the RB wire for the remote Steptronic switches terminates at the rotary coupler (C0082); G wires then supply the feed from the rotary coupler (C1254) to the up Steptronic remote switch (C1664) and down Steptronic remote switch (C1665). The illumination bulbs/ LED’s are connected to earth as follows:
l The rear fog guard lamp switch (C0064) on LHD models/ transmission mode switch (C0985) on Japan EM-CVT models, automatic gearbox selector indicator lamp (C0245), RH window switch (C0081) and LH window switch (C0321) are earthed on B wires connected to an earth point (C0557).
l The up Steptronic remote switch (C1664), down Steptronic remote switch (C1665), heated rear screen switch (C0072), rear fog guard lamp switch (C0064) on RHD models, oil temperature gauge (C0344), analogue clock (C0232) and hazard warning switch (C0096) are earthed on B wires connected to an earth point (C0564) via the passenger compartment fuse box (C0584 and C0583).
l The radio/cassette player (C0098)/ CD player (C1353) is earthed on a B wire connected to an earth point (C0563).
l The instrument pack (C0233) is earthed on a RW wire connected to the instrument illumination dimmer (C0201), then a B wire from the instrument illumination dimmer (C0201) to an earth point (C0564) via the passenger compartment fuse box (C0590
and C0583).
l The A/C switch pack (C0275), fresh/ recirculated air switch (C0750) and heater control illumination (C0051) are earthed on B wires connected to an earth header (C0017).

Except for the instrument pack, the interior illumination bulbs/ LED’s illuminate at a fixed
brightness level. The brightness level of the instrument pack illumination is dependant on
the setting of the instrument illumination dimmer. Turning the thumbwheel of the instrument
illumination dimmer alters the resistance of the instrument pack’s earth path and hence
brightness level of the illumination bulbs.

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© 2005 -2008 Dieter Koennecke