I've bought a used c4 VTS a while ago and interior lights(ones that light up when doors are opened, both front and back) don't work(although map lights and door lights(bottom) work).
Installations are fine, lamp housings are fine, but in the BSI where a 5A fuse should've been, I've found a 7.5A. I've put a 5A in, but lights still don't work.
Could the BSI be permanently damaged?
So the middle button on the roof lighting panel is in the middle setting?
If you post or PM your VIN I will have a look at the wiring diagram for you and see if it is another fuse. In the 2011 manual I have the interior lights are F4 and is 20 Amp and also operates the Trailer lighting if fitted. So your VIN would help confirm the right model.....
It's a 2006 VTS(2.0 180). Here's the VIN: VF7**************[VIN obfuscated, can be read by forum staff]
Fuse should be "F7", which should be 5A, but instead, 7.5A was in place.
Switch is in the middle, but even if it's on "ON" position, lights don't work. Door sill lights, glove box light, map light and boot light all work, just front and rear "main" lights don't work.
Tried with friend's light housing from 307, didn't work. Lights don't come on whether I use that switch, unlock the doors, open the doors...
While 7.5A was in place, I've measured voltage on the housing. When I switched lights on, it would drop from 12V to 5V.
Tried cleaning all connectors, new bulbs, BSI reset and nothing worked. Then I let it be and used the car without the light and a week ago I discovered that wrong fuse was in. Then I put a correct one but nothing changed. Didn't perform BSI reset and haven't measured voltage since then though.
Additionally, when I got the car, "customizeable button" on the steering wheel was set to "Interior lights" so footwell lights would come on when pressed. I guess someone wanted that function and tried to disable ceiling lights. All I'm wondering now is could've BSI been damaged by putting a 7.5A fuse instead of 5A.
No shouldn’t have damaged the BSI, but with that extra info I suspect someone has changed one of the configuration settings in the BSI. That’s the trouble with modifying settings that may not be applicable to a particular vehicle.
I doubt very much the fuse will have anything to do with it at this point, either there is a power supply or there isn’t. But the BSI does control the system, so I’ll have a look at the wiring diagram tomorrow for you.
Unfortunately not via DIY, there is no reset feature. The only way is to get the Citroen dealer to download the BSI software for you from their servers. Then they would need to go though manually to check the correct options are configured too. Somthey would charge you Diagnostic time and programming time to do this.
Let’s see if there is anything Imcan see tomorrow first, then that is an option you can consider if you decide to.
I’ve not driven one of those C4s for some time, but it seems that the button can be programmed for the night panel function, or other options. Have you tried to hold down the button to programme it by selecting another function from the display. I believe you have to scroll the display then, to select a desired option. I’m not saying this is normal for the interior lighting though, as that should be in regardless. I just thought it is something we can eliminate.
Ok, so looking at the wiring, I would check the earths. It looks like the earths (MC301 & MC302) from the front and central interior lights (3010 & 3030) and check the 40 pin white plug in the BSI that wires 300 & 301 go to.
I would also check to see that there is power going through the fuse F7.
Thanks Marc!
First od all, im not quite good at dealing with electricity. How do I check if there's power going through the fuse? And how to check grounds?
Also, there's a red relay hanging down when isolation above pedals is removed. Could it somehow impare behavior of interior lights?
Have a look at this video - it should have a continuity check on the multimeter - some give you an audible sound to tell you it is ok.
As for the earthing - trace the earthing points and make sure they are not corroded and have good contact with the car body. Any earths that are routed through the doors (via the tubing from the engine bay to the doors) are prone to stress breaks from opening and closing the doors all the time. You should be able to easily take off the protective tube and then have a close look at the wires to see if there are any obvious breaks.
Not sure what you mean by the wire above the pedal - a photo might help though.
Right, today was raining quite a bit so I didn't do much.
I've removed the fuse and map lights stopped working which would suggest that BSI is physically not damaged. Right?
Didn't do anything to wires, measured voltage, it was zero.
Here are two things bothering me around the BSI.
This is the free hanging relay:
And this is something that's unplugged, don't know what and can't see where it should be plugged in:
It is not uncommon for car manufacturers to only have a couple of wiring looms for a wide model range. For example, if you had a C5 LX it would not have the option for electric seats (and so would not have the loom that supports this), while the VTR model could have such seats (so the loom would be fitted regardless of what type of seating was installed). That unconnected plug could be for an optional extra not fitted to your particular car (although somebody could have had that extra fitted when they specced out their car from new). As a personal example I do have a C5 MkI VTR, and it originally had a standard rear view mirror with manual dim switch. However, the wiring was in place for an automatic rear view mirror (with light level sensing), so I bought such a mirror from a local scrap yard for a few pounds and fitted.
James ex BX 1.9
ex Xantia 2.0HDi SX
ex Xantia 2.0HDi LX
ex C5 2.0HDi VTR
ex C5 2.0HDi VTR
ex C5 2.2HDi VTX+
Yes, I am paranoid, but am I paranoid ENOUGH?
Out amongst the stars, looking for a world of my own!
