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> Rear Boot light sensor
duemila
post 12th February 2018 12:37
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Does anyone know where the rear boot light sensor is exactly, my car thinks the boot is open, and the light stays on permanently in the boot, which happened to drain and kill a very good battery that I've had in the car for 10 years, for now I've disconnected the bulb, Any advice appreciated,
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shpuncik
post 12th February 2018 19:55
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QUOTE(duemila @ 12th February 2018 14:37) *
Does anyone know where the rear boot light sensor is exactly, my car thinks the boot is open, and the light stays on permanently in the boot, which happened to drain and kill a very good battery that I've had in the car for 10 years, for now I've disconnected the bulb, Any advice appreciated,


there's micro switch in lock or near it in boot lid.
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dante giacosa
post 12th February 2018 21:09
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Hey Valdas-

you took the words right out of my mouth!

I've been thinking about that recently myself- as I've always marvelled at how it 'knows' the boot is open, just from the press of the release switch in the front. So it had to be the lock.

(rather than a hyper-sensitive tilt switch!)
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shpuncik
post 12th February 2018 21:50
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hi Jim

it's simple microswitch - similar to the one in the picture. it was a while ago when I was looking into mine so just don't remember whether it is directly in boot lock or mounted somewhere on it.



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dante giacosa
post 12th February 2018 22:23
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Something very similar to that was in the release 'tabs' of the tailgate(s) of my Audi A3 (8L). They failed on both examples that I had actually.

Interesting- I has always imagined them to be on the lower part of the mating boot-edge; but of course; that is just a 'strike-plate' isn't it. The mechanism is in the boot lid itself.

I've never been in there actually. I hope its all alright in there!
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shpuncik
post 12th February 2018 22:52
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biggest pain in the a**e would be removing inner lower boot lid trim and not breaking tabs holding it - more than 90% I'm certain they'll brake biggrin.gif
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dante giacosa
post 13th February 2018 09:55
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yes- I'm in touch with that emotion
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VROOM
post 13th February 2018 20:25
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I had the same problem recently. You can see the small switch in the tailgate lock without taking the hatch trim off. I sprayed it with wd40 and prodded it a bit. Seems OK now.
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bernois01
post 15th November 2020 23:07
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Hello,

I also have a faulty microswitch and i want to buy a new one but i don't know the specifications or reference or manufacturer. The microswitch in my 145 is exactly like this one
Attached Image


thanks for your help
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dante giacosa
post 16th November 2020 22:50
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Hey Bernois;

sorry- I can't answer that.

There are two options;

1. source another from a scrapped car

2. trawl through RS and identify the nearest example

https://uk.rs-online.com/web/c/switches/mic...ions=4294864096

This post has been edited by dante giacosa: 16th November 2020 22:51
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bernois01
post 17th November 2020 02:55
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QUOTE(dante giacosa @ 16th November 2020 23:50) *
Hey Bernois;

sorry- I can't answer that.

There are two options;

1. source another from a scrapped car

2. trawl through RS and identify the nearest example

https://uk.rs-online.com/web/c/switches/mic...ions=4294864096


Another from a scrapped car, difficult to find ... and generally not working.
Second option : without technical specifications i can't find it sad.gif

Do you have specifications for this microswitch ?
Thanks
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dante giacosa
post 17th November 2020 13:47
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QUOTE(bernois01 @ 17th November 2020 02:55) *
Another from a scrapped car, difficult to find ... and generally not working.
Second option : without technical specifications i can't find it sad.gif

Do you have specifications for this microswitch ?
Thanks


the spec isn't going to be that important, as the current for the boot-light is so low.

quite a lot of these seem to be 9.53mm mounting 'pitch' for the two holes. Can you measure between the centres of the metal studs which secure it. Does it look like it's riveted on...?
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bernois01
post 20th November 2020 21:18
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QUOTE(dante giacosa @ 17th November 2020 14:47) *
the spec isn't going to be that important, as the current for the boot-light is so low.

quite a lot of these seem to be 9.53mm mounting 'pitch' for the two holes. Can you measure between the centres of the metal studs which secure it. Does it look like it's riveted on...?


hey dante giacosa, yes it is riveted on but it is not a problem ; i only have to find the right microswitch.
Without spec it is very difficult. Do you thing it is a SPDT microswitch snap action ? 12 v dc ? A ?
the size of the microswitch is about 20 mm x 15 mm and it is prewired (2 wires)

on the microswitch, i see nothing else than "679", may be it is helpful for you ?

This post has been edited by bernois01: 20th November 2020 21:20
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dante giacosa
post 21st November 2020 11:20
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QUOTE(bernois01 @ 20th November 2020 21:18) *
hey dante giacosa, yes it is riveted on but it is not a problem ; i only have to find the right microswitch.
Without spec it is very difficult. Do you thing it is a SPDT microswitch snap action ? 12 v dc ? A ?
the size of the microswitch is about 20 mm x 15 mm and it is prewired (2 wires)

on the microswitch, i see nothing else than "679", may be it is helpful for you ?


The only info we need is to confirm the mounting pitch of the rivets

The action will be SPST, but other actions could used, with additional wiring ignored. I see the flying leads, yes...
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bernois01
post 21st November 2020 19:00
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QUOTE(dante giacosa @ 21st November 2020 12:20) *
The only info we need is to confirm the mounting pitch of the rivets

The action will be SPST, but other actions could used, with additional wiring ignored. I see the flying leads, yes...


ok thanks a lot.
Do you know where i can find a microswitch with same flat lever ? i have tried today (spent a lot of hours on internet) and can not find (the flat lever is broken on my microswitch)
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dante giacosa
post 22nd November 2020 01:11
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QUOTE(bernois01 @ 21st November 2020 19:00) *
ok thanks a lot.
Do you know where i can find a microswitch with same flat lever ? i have tried today (spent a lot of hours on internet) and can not find (the flat lever is broken on my microswitch)


I'm not sure I can bring much more to this party.

If you can confirm the pitch; I'll pick you a microswitch in minutes.
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bernois01
post 22nd November 2020 14:55
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QUOTE(dante giacosa @ 22nd November 2020 02:11) *
I'm not sure I can bring much more to this party.

If you can confirm the pitch; I'll pick you a microswitch in minutes.


i think it is a little less than 10mm... may be 9.53 ?
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dante giacosa
post 22nd November 2020 22:35
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😂 okay-

Leave it with me overnight...
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bernois01
post 22nd November 2020 23:17
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QUOTE(dante giacosa @ 22nd November 2020 23:35) *
😂 okay-

Leave it with me overnight...


smile.gif
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dante giacosa
post 23rd November 2020 21:40
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okay!

sorry about the delay there, Bernois- busy day at this end

If I was doing this; I would start with this

https://uk.rs-online.com/web/p/microswitches/6822130/


As I don't have a 145.gif myself, and run a 146.gif , I'm not uniquely placed to tell whether the overhanging-'tail' of your microswitch (as pictured on the left) is used to actuate the switch, from the sprung-arm behind it; or whether (as is more usually the case); the switch is actuated from in-front. By something not in the picture.

If it is in front; this switch will work.

The cables exit the rear of the package, as opposed to the side, but it doesn't look like that's a problem from the picture. There will only be two wires (despite the image) They will be black and blue.
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