hi guys.i have a problem with my interior lights.when the switch is in the position when the doors supposed to turn it on and off,it stays on with closed doors

im a bit confused since i could not find any switch which the door press when i close it ,like on other cars.does it operated by the micro switch inside the central lock mechanism in the door ?

by the way when i open the drivers side door im hearing the fuel pump kicks in and also when the headlights turned on,it beeps when i open the drivers side door so the switch must be good

what am i missing here?

thanks

Yes the interior light switch is a microswitch on the drivers door lock module inside the door. If those other functions are working though, it might be the relay in the convenience unit  Onboard Supply Control Unit (J519) which  controls the light.

 

 

 

 

Edited 13 November, 20205 yr by TMB

thanks.what and where is that unit?also do you have wiring diagram too?

and one more thing:if i left the lights on and open just the front passenger side door,does it have to beep?or just with the drivers side door?

Only beeps with the drivers door.

 

Here's a video....

 

 

 

There is an interior light wiring diagram in amongst these...

 

http://inhouse.uw.hu/elektronika/Skoda_Fabia_Praktik_1.9_SDi_2006_wiring.pdf

1 hour ago, Alext said:

thanks.what and where is that unit?

 

Sorry, just realised you were asking where the convenience unit Onboard Supply Control Unit (J519) is. It's under the dash above the accelerator pedal. However, if the relay is faulty if can't be replaced unless you open the module and solder a new one in. Not an easy job at all. You can replace the whole unit but they have to be coded to the car as far as I know.

Edited 13 November, 20205 yr by TMB

thanks for the diagram.mine is a bme 1.2l engine but the diagram seems identical.as far as i get it by the diagram the number 10 unit (electrical system control unit) must be the one youre talking about as convinience unit

if i get it right that unit must disconnect ground to the interior lights when the door closed

to proceed further i need a diagram from the internals of that unit to determine where is the fault.do you have this too?

 

Edited 13 November, 20205 yr by Alext

2 minutes ago, Alext said:

to proceed further i need a diagram from the internals of that unit to determine where is the fault.do you have this too?

 

Unfortunately I don't. Someone else may be able to help though.

I think I was mistaken about the convenience unit. I think the relay is actually inside the Onboard Supply Control Unit (J519) above the accelerator pedal. That is a different module to the convenience unit.

thanks.hopefully wino shows up and tells the answer

by the way im wondering what if the front passenger side door micro switch is bad?it can cause the lights to stay on too,right?

but how to test it? at the drivers side its easy with the headlight switch or by the sound of the fuel pump but what about the other doors?

also does the 2 rear side doors have to switch the interior lights or just the front doors? (my car just have front interior lights,no rear)

 

5 minutes ago, Alext said:

by the way im wondering what if the front passenger side door micro switch is bad?it can cause the lights to stay on too,right?

but how to test it? at the drivers side its easy with the headlight switch or by the

 

Hmmm, I guess you coud pull off the plugs in the rubber door bellows and see if the light goes out.

7 minutes ago, Alext said:

also does the 2 rear side doors have to switch the interior lights or just the front doors? (my car just have front interior lights,no rear)

 

Mine's only a base model Fabia but the back doors do work the interior light.

umm.i think the door switch has to be pushed in (closed) when the door is closed,that way the lights turn off

now if i disconnect the plugs i just open the circuit so thats the opposite of what i want

Edited 13 November, 20205 yr by Alext

im checking the diagram you have sent and my guess is that i have to measure somehow the other three doors door switch first before i suspect a fault in the convinience modul.hopefully just one of the door switches are worn so that keeps the lights on

now my problem is that on the diagram the door lock units has five switches inside but the diagram wont tell which is which

do you have any idea?

4 minutes ago, Alext said:

 

now my problem is that on the diagram the door lock units has five switches inside but the diagram wont tell which is which

do you have any idea?

 

Yes, the interior light microswitches are on the outside of the lock module. They are held on with a metal clip. All other microswitches are inside the unit.

Edited 13 November, 20205 yr by TMB

i know where the switch is phisically

what i need to know is which switch is it on the wiring diagram (the lock module seems to have 4 more internal switches too) and the diagram wont tell which is which

if i know which is the door switch from the 5 on the diagram,that way i can trace it back by the wire color then i can measure it at the door bellow plugs without the need to take apart 3 doors

 

Don't know. The diagram is not detailed enough.

Edited 13 November, 20205 yr by TMB

1 hour ago, Alext said:

umm.i think the door switch has to be pushed in (closed) when the door is closed,that way the lights turn off

now if i disconnect the plugs i just open the circuit so thats the opposite of what i want

 

Nah, it works the other way around. The switch is not being pushed when the door is closed. When the door is opened the switch is pushed by the lock cam and the circuit is closed.

Edited 14 November, 20205 yr by TMB

Door contact switches are the lowest of the 5 shown in those front lock internal circuits, and the lowest of the three in the rear door ones.

The front ones' wires pass through pin 2 of the brown 6-way connectors at the A pillars on their way to J519

The rears wire through pin 3 of the blue 6-way connectors at the B pillars.

 

 

I doubt you'll find circuits published of what goes on within the J519 unit. I have some I can look at, but I'd guess the wires go to digital input circuits with pull-up resistors, so their state changes from high to low when a door is opened and the wires get earthed.  

 

Interior light relay sticking on due to contact wear is possible I guess, as Lee suggested.

Coding of J519 is straightforward with VCDS, just read the code number of the old one and input it into the replacement. Very expensive new though. Slight gamble secondhand, but can be found pretty cheap (<£20 with patience).

Edited 14 November, 20205 yr by Wino

thanks.first of all i would like to check all door switch before moving to the relay in the convinience module

as far as i see,the lowest switches on the diagram(door switches) connects the brown ground wire to the j519 unit by the brown/yellow wires.right?

sooo im a bit confused here since lee told that the switches in the door are open when the door is closed.can you confirm this?

so if thats true,the j519 unit only turn on the interior lights when one of the doors open-so one of the switch closed,so it gets the ground via the door switch?

that way i can check every door by disconnecting the wires at the door bellow?

will it work? i think theres one connector with multiple wires together in the bellow so disconnecting all may affect other things too

Edited 14 November, 20205 yr by Alext

When the door is closed, the switch does not conduct (as shown in the circuit picture). When the door is opened, the switch does conduct, grounding the wire.  I think this is the same as what Lee said, when he said the circuit is closed, I believe he means the switch conducts. This is standard description in English, open circuit means no conduction, closed circuit means conducting.  Sounds confusing doesn't it!

 

I doubt if there is a direct connection between the door switch inputs and the grounding of the interior light, I think there will be a microcontroller in between, interpreting relevant inputs and deciding on correct outputs (which will include grounding the interior light wire).

 

 

 

 

i see.so the switch in the door closed when the door is open,ok

of course there is not a direct connection between the switch and the interior lights,theres this j519 untit between,thats clear

the question is how to check if every doors switch is working correctly?

does disconnecting the connector at the door bellow can be a way to check it?

or do i have to check the brown/yellow wire (without disconnecting the connector) to ground at the door bellow  with opened door?

Edited 14 November, 20205 yr by Alext

If you have VCDS you can look in Measuring Blocks of Central Electronics what status J519 thinks each door has (open/closed).

 

If you don't, then disconnecting each door, one by one, should tell you if there is a door giving a false indication of 'open'. The connectors involved are as I described before. 6 way brown ones at front doors, blue at rears. 

thanks,ill give it a try

i dont have vcds

4 hours ago, Wino said:

I think this is the same as what Lee said, when he said the circuit is closed, I believe he means the switch conducts.

 

Yep