Heater controls and instrument cluster illumination

malcolm lee

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Aug 24, 2019
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Your Mercedes
190E 1988 2.3 16v
190E 2.3 16v 1987 - no heater controls or instrument cluster illumination
The center of the heater knobs are lit via a tube and the knob surrounds via bulbs connected in series. Also appears the fibre optic lighting wires not working.I have checked the dimmer potentiometer as OK but according to the wiring diag. the grey/blue wire to the knob surround bulbs appears to connect to various items like heated seat switch and relays, ECU even hazard light switch. I may be using wrong diagram but fuse is OK and all bulbs were changed. Grateful for any assistance.

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