faulty bulb failure warning

[peeps1972]

Hi.first time post.
My vito displays the orange bulb fault on the dash.but all bulbs are working.
The fault turns on my main beam lights and darkens my dash display.
I can turn the lights off by turning the light switch to sidelights but still have no dash lights?? Any ideas?

 

[grumpyoldgit]

The warning light could be caused by a bulb which is about to fail. The system works on measuring resistance and is very sensitive.

If you mean the dash lights dim when turning the headlights on, I would say that this is probably normal as if like most Mercs it has a daylight sensor which controls the lights when on the automatic setting and maybe other settings. You will probably find that they behave differently in daylight compared to darkness. I've noticed mine dim while driving as dusk draws in.

Again with the switch turned to sidelights, it will depend on whether the key is in the ignition and daylight or darkness as the whether the dashboard lights illuminate or not. (No need for dash illumination if the vehicle is parked up briefly with the sidelights left on or having them on in daylight while driving).

 

[peeps1972]

Thanks for the reply.my problem got resolved today, it was a faulty light switch. The orange bulb lightbis out and dash lights now work fine.