I got Mercedes A Class W168. Recently I got a weird problem, when I switch the key, only battery & SRS lamps lit at dashboard. Engine, headlamps, radio, horn, windows, power steering work. Wipers, signal lamps, interior & dash lamps, central locking are out of service, even when engine running.

Ceiling lamp turns on for a second then goes immediately.

What would be the problem? It doesn't seem like blown fuse problem to me.

  • since battery and srs lamps are working so it probably wire is lose somewhere and it just sparks enough to light the ceiling lamp i think you should go to the mechanic – Deiknymi Jul 24 '13 at 17:35
  • Which key are you "switching" to? or am I understanding what you wrote incorrectly? "when I switch the key" – cinelli Jul 27 '13 at 8:20

With the vehicle off and key out of the ignition locate the fuse box and remove fuse #30 (DAS transponder/RFL/Instrument cluster). Give it about 5-10 second before reinstalling it and then put the key in the ignition and see if everything works. It's possible that the DAS module had gotten a little confused at some point and had placed itself into a limp"-type mode. Pulling the fuse and then reinstalling it will kill the modules power and force a hard reset.

NOTE: If this fixes your issue and for some reason it happens again down the line, Then make sure to have it checked by a shop with MBZ equipment (Star Diagnostics).`

  • Yes that's what I did today, fuse #30 a 7.5A got a contact problem, I unplugged & re-plugged it and viola... Actually I did check all the fuses one by one while flashes on... – Nime Cloud Jul 28 '13 at 20:33
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    Glad you got it worked out. – cinelli Jul 28 '13 at 23:39

It doesn't seem like blown fuse problem to me.

Are you sure about fuses? Did you check all with a multimeter / ohmmeter?

  • questions should be left as comments not answers. – cinelli Jul 26 '13 at 5:00
  • No, I didn't think that multiple fuses can die at once... Dimmed ceiling lamp lits when turned on then goes off when lits at max. Need to read it's logs... – Nime Cloud Jul 26 '13 at 5:46

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