Brake lights not working

[BENC911]

Hello, is been a while!

I have been trying to see why my break lights are not working. I have checked ALL fuses and the lightbulbs but they DONT WORK!

I am not sure if a relay is bad or what, but is kicking my XXX

 

Any help will be appreciated!

[JFP in PA]

1 hour ago, BENC911 said:

Hello, is been a while!

I have been trying to see why my break lights are not working. I have checked ALL fuses and the lightbulbs but they DONT WORK!

I am not sure if a relay is bad or what, but is kicking my XXX

 

Any help will be appreciated!

 

Check the switches on the brake peddle, one is for cruise, the other is for the lights.

[BENC911]

Purchased the new switch from pelican, put it on and nothing still KO

you guys have like a cabling diagram to see if the cable from there to the back broke somewhere

i see lots of cables under the passenger seat but not sure what they are for

jiggle a few to see if it helped but nothing

 

actually i just realized that the switch hits the clutch not the breaks what an idiot, however in all photos i search they call this the break light switch anyway i attached a photo but that hits the clutch

 

so it still may be the switch but i cannot find it! Ill search more in google

Edited September 27, 2019 by BENC911

[JFP in PA]

The clutch switch is for the cruise control system.

[BENC911]

Ok, so i replaced the right one now and nothing....... SHXT i hate this. Could this be a relay problem?

 

what are those cables under the passenger seat for?

Edited September 27, 2019 by BENC911

[JFP in PA]

1 hour ago, BENC911 said:

Ok, so i replaced the right one now and nothing....... SHXT i hate this. Could this be a relay problem?

 

what are those cables under the passenger seat for?

 

The immobilizer system.   You need to stop parts swapping and start basic diagnostics; start by checking the pedal switch wires to see if you have both power and ground.  Then check the harness for continuity to the brake lights themselves, and the tail light grounds.

[BENC911]

9 hours ago, BENC911 said:

Purchased the new switch from pelican, put it on and nothing still KO

you guys have like a cabling diagram to see if the cable from there to the back broke somewhere

i see lots of cables under the passenger seat but not sure what they are for

jiggle a few to see if it helped but nothing

Good idea, the back lights work is just the breaks lights that don’t. The cables from the switch are 3: green/black a red/black and a yellow/black.

There is power

 

when i touch a pair and the car is running I see 14V, a different pair I see 10.3V and then last pair like 3.7V

 Did more testing and tested the switch next with ohm meter, three of the prongs have continuity one doesn’t , however when we press the one that did not get it. So i think the switch is good also

Edited September 27, 2019 by BENC911

[BENC911]

Should the instrument computer say that the break lights are NOT working?  Just wondering......

[BENC911]

HELP

 

Took it to the shop and they are telling me it is the “computer” ?  What is that?  Are they trying to scam me?

[JFP in PA]

1 hour ago, BENC911 said:

HELP

 

Took it to the shop and they are telling me it is the “computer” ?  What is that?  Are they trying to scam me?

 

Which computer?

[BENC911]

That is what he told me, sorry we downloaded the diagrams and we could not find the problem, we think is the computer of the car? I thought you guys knew!

[BENC911]

I have been searching the internet and I guess they meant the ECU / DME 997618607?

 

Also what is 991 618 145?

Edited October 2, 2019 by BENC911

[JFP in PA]

1 hour ago, BENC911 said:

That is what he told me, sorry we downloaded the diagrams and we could not find the problem, we think is the computer of the car? I thought you guys knew!

 

The car actually has several different "computers" that control different functions.  The DME should not impact brake light functions, but the ABS/PSM unit might.

 

The 991 618 145 is the electronic parking brake control unit.

 

[BENC911]

Thanks for all your help, I hope we are getting close, do u have that Part # for the ABS/PSM unit?

[JFP in PA]

10 minutes ago, BENC911 said:

Thanks for all your help, I hope we are getting close, do u have that Part # for the ABS/ PSM unit?

 

I don't offhand, but board sponsor Sunset Porsche's part website will.

[BENC911]

i will call them, thanks for intro!

 

I did a durametric test late yesterday and tells me the gateway is "bad".... 997 610 107 04, will ask them about that as well.

[BENC911]

well the problem is fixed thanks for all your ideas and direction. as i started looking for some of these parts, one of them was "below" the drivers seat, Body Control Module Rear or something. Anyway I guess that moving seat back/forward "broke" a couple of cables!  Connected them and did a reset in durametric and break light WORKS!!

 

will be moving to the next problem but this one is fixed!