W166 2014 bulb failure warning with led's on caravan

Corkyball

New Member
Joined
Jun 8, 2017
Messages
2
Car
Ml350 bluetec 4matic
Hi guys can anybody offer advice on how to stop bulb failure message on command when caravan connected, van has led lights all lights working ok
 

Trickythemerc

MB Enthusiast
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Feb 1, 2015
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1,330
Location
South Manchester
Car
CLK 220 CDI Sport 2009
Bulb failure systems don't like LEDs due to the lack of resistance, you may need a special wiring rig for the caravan lights to fool the bulb failure system into thinking the van has normal wire wound bulbs.
 

350_Coupe

Active Member
Joined
Oct 31, 2010
Messages
783
Location
Oxfordshire
Car
2005 C350 Coupe SE
or do as we have been doing on the car itself, and swap bulbs for CANBUS compliant ones

is it all of the bulbs that are triggering it, or just some ?
 

Martyn_n

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Joined
Nov 27, 2010
Messages
625
Location
Leicester
Car
W124 E320, W163 ML270 & W166 ML350
Is it a Swift group caravan? If so you can get a kit from Sargent that fixes this known issue.
 
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Corkyball

New Member
Joined
Jun 8, 2017
Messages
2
Car
Ml350 bluetec 4matic
Hi tricky, i am aware about leds offering no resistance, on my earlier ml270 the indicators wouldnt flash at correct speed untill i fitted a special box to my caravan, however you would think it would work on my later 350 but it wont
 

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