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joristz750
Newbie


Joined: 30 Nov 2018
Posts: 2



PostPosted: Fri Nov 30, 2018 5:23 pm    Post subject: 991 brake light switch Reply with quote

hello,
I am new here. Live in Belgium an I have a 991 S.
after 92000 km, I have my first issue with my car. The brake light switch was not working properly and I got the warning that the PSM was put out of order. ( also start/stop) My Porsche Centre cleaned the switch ( don't know how) and the system worked again. Now, after 10 months, again the same problem. My local Porsche mechanic changed the switch with a new one. After 1 month, the same problem… I am getting nervous about this and I wonder if there might be another cause then the switch itself. Is this problem familiar to someone? Many thanks for your input. Cheers Joris.
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7004
Location: Brighton


PostPosted: Fri Nov 30, 2018 6:28 pm    Post subject: Reply with quote

Difficult to give you an answer but i will say .. is there any chance you rest your foot under the pedal when driving .. is it possible you have in some way pulled the pedal upwards basically .

The switch is an air gap sensor .. magnetic i belive .. there is no rod touching the pedal and as such the distance between the sensor and the pedal needs to be exact .

Thats about all i can say as everything else means inspecting the car and looking at fault codes .
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joristz750
Newbie


Joined: 30 Nov 2018
Posts: 2



PostPosted: Sat Dec 01, 2018 2:38 pm    Post subject: Reply with quote

Hello
indeed, it is a "hall" sensor ( magnet).
Point is that I have the car for 5 years now, and never had a problem before. In one year time, I had 3 issues with this switch. And the reading of the computer tells ... the switch has a fault.


the switch costs 32 euro, so it's nothing much about.
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7004
Location: Brighton


PostPosted: Sat Dec 01, 2018 4:43 pm    Post subject: Reply with quote

The lack of moving parts should mean this part lasts for a long time .. the only problem i have ever come across with these is when the gap is altered.


I am however starting to wonder about a wiring fault , i dont have the topoligy at home (list of the control units and what sensors go where ) but i would expect the signal would goto the steering column CU and then a can/Lin bus message to the PSM.

It would be worth checking actual values and maybe a pin out of the wiring to check for resistance if this fault continues .
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