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Old 30-11-2019   #1
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Ducato X250 dipped light failure

My vans ducato x250 dipped lights both come on then go off some time 30 secs others less headlights are fine. Has anyone had this problem fixed ? Or know of any relay locations as I think I can hear a clik when they go off
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Old 30-11-2019   #2
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Re: Ducato X250 dipped light failure

I'd suggest you download the "Fiat Ducato 1st_X250_Training Manual.pdf" from the download section on the forum, link here:

https://www.fiatforum.com/downloads....downloadid=478

Page 120 onwards shows that the LH/RH dipped beams are separately fused, but appear to be controlled by a single "contactor" (I'm reading relay) at T01 in the underdash fuse/relay box.
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Old 02-12-2019   #3
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Well already had the download so checked relay today and found all to be ok ?
Until I started the engine then no dipped lights working
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Old 02-12-2019   #4
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Re: Ducato X250 dipped light failure

Can you confirm that with the ignition ON that the dipped beams work ok but go out if the engine is started as that is how I understand your last post?

I have attached the dipped beam operation and wiring information. The relay within the dash fuse box is energised from a negative going signal, i.e battery 0V, from the Body Computer so that is where to start. Is the relay getting the signal? If you remove the relay and short out pins 30 to 87 and put it back in do the lights remain ON?
Attached Files
File Type: pdf dipped headlights.pdf (326.4 KB, 32 views)
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Last edited by rayc; 02-12-2019 at 21:23.
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Old 02-12-2019   #5
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Re: Ducato X250 dipped light failure

Quote Originally Posted by rayc View Post
Can you confirm that with the ignition ON that the dipped beams work ok but go out if the engine is started as that is how I understand your last post?
Yes thats exactly what happens I'll do as you suggest as soon as I can and report back Thanks for your input
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Old 15-12-2019   #6
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Quote Originally Posted by rayc View Post
Can you confirm that with the ignition ON that the dipped beams work ok but go out if the engine is started as that is how I understand your last post?

I have attached the dipped beam operation and wiring information. The relay within the dash fuse box is energised from a negative going signal, i.e battery 0V, from the Body Computer so that is where to start. Is the relay getting the signal? If you remove the relay and short out pins 30 to 87 and put it back in do the lights remain ON?
Ok tried that and dipped lights came on when I replaced relay with ign off and stayed on with engine running
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Last edited by witzend; 15-12-2019 at 18:16.
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Old 15-12-2019   #7
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Re: Ducato X250 dipped light failure

Quote Originally Posted by witzend View Post
Ok tried that and dipped lights came on when I replaced relay with ign off and stayed on with engine running
Then remove the link across the relay and monitor pin 86 with the negative lead of a multimeter set to measure DC volts with the positive lead connected to battery positive. You can connect it to the relay with a thin wire to allow the relay to be reseated.

Pin 86 should be driven negative from the Body Control Module when the dipped beam is ON. What does the meter show a) when ignition is on with dipped beam selected and engine not running? What happens when the engine is started?

It can be helpful when doing this sort of testing to have an extension socket with test contacts that allows the relay to be extended out of the socket whilst testing. An example of a kit that does this is the Lilse 56810 relay test Set. Most auto electricians build their own by butchering a relay and soldering extension wires and a relay holder to the butchered relay base.
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Last edited by rayc; 15-12-2019 at 19:34.
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Old 16-12-2019   #8
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Re: Ducato X250 dipped light failure

Quote Originally Posted by rayc View Post
Then remove the link across the relay and monitor pin 86 with the negative lead of a multimeter set to measure DC volts .
86 has no reading at all
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Old 16-12-2019   #9
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Re: Ducato X250 dipped light failure

Pin 86 is the 'driver' contact of the relay and is taken to battery negative by the Body Computer when the dipped beams are selected. A multimeter set to DC volts with the positive lead connected to battery positive should read the battery voltage when the negative lead is connected to pin 86 and dipped beams are selected with ignition ON.
From you fault description that the dipped beams work with ignition ON but engine not running, pin 86 must be going negative for the relay to operate.

An auto electrician should be easily able to determine the problem with the circuit I provided. Something must be happening when the engine is started that interferes with the relay operation.

What happens if you connect pin 86 to battery negative with the ignition ON but lamps NOT switched ON?
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Last edited by rayc; 16-12-2019 at 17:33.
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Old 16-12-2019   #10
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Quote Originally Posted by rayc View Post
What happens if you connect pin 86 to battery negative with the ignition ON but lamps NOT switched ON?
Reads 12v
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Old 16-12-2019   #11
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Quote Originally Posted by witzend View Post
Reads 12v
Yes and I assume the relay oerates and dipped beam is on?
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Old 16-12-2019   #12
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Quote Originally Posted by rayc View Post
Yes and I assume the relay oerates and dipped beam is on?
Relay wasn,t replaced no lights came on
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Old 16-12-2019   #13
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Quote Originally Posted by witzend View Post
Relay wasn,t replaced no lights came on
If you want to carry on give me a pm with email address
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Old 17-12-2019   #14
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Re: Ducato X250 dipped light failure

Quote Originally Posted by rayc View Post
If you want to carry on give me a pm with email address
PM sent I think ?
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Old 17-12-2019   #15
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Re: Ducato X250 dipped light failure

Quote Originally Posted by witzend View Post
PM sent I think ?
Not received yet
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