Faulty brake light switch F (Solution)

Hello, tinkerers,

I have a blinking indicator light and also a clear error message, and I'm looking for some tips on how to fix/repair it.

Error Code:
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1 DTCs Found:
00741 - Brake Pedal Position Monitor
27-00 - Implausible Signal

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Log with VagCom, Group 6 MSG + my comments

Brake Pedal
F/F47/F36

0 0 1 Unlocked brake
0 1 1 Brake applied
0 0 1 Unlocked brake
0 1 1 Brake applied
0 0 1 Unlocked brake

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From the texts kindly provided by Michael II:

Error Code: 741

Brake Pedal Monitoring - Unplausible Signal

Possible Causes:
Brake light switch (F) is faulty
Brake Pedal Switch (F47) - Defective

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Since F47 apparently shifts perfectly with the brake/no brake function, as indicated by the above log, it seems likely that the brake light switch "F" is not functioning correctly.

Now my question: Where can I find this switch/contact "F", and how can I bypass the displayed error if this switch is defective? I was thinking of something like replacing the feedback signal from F with the signal from F47. But that would destroy the redundancy of the system. Maybe F is also just easy to fix?

I am very grateful for all the tips!

Best regards,
Georg

Normally, both switches are found above the brake pedal. As far as I know, one switches on when closing and one when opening. (I think you understand what I mean, even with the awkward wording).

hi,
The switch shouldn't cost the world; it's just a small plastic piece. Maybe it's just misaligned/the screw is loose?

Hi, Marcus

Hello everyone!

Thank you for the quick responses.
Fortunately, the error was much easier to find. Unfortunately, I (once again) was too stupid to carefully analyze the error messages of the STG.

I thought that the brake lights were working. At least, when I looked in the rearview mirror, they were red when I braked. However, that was only the LED strip. Both brake lights (right, left) were burnt out. A visual inspection of the lights, carried out in the light of a flashlight in the evening, also did not show that they were burnt out. This just came up while manually pressing the pedal with a piece of wood.

Since switch F obviously only checks the voltage of the two 12V lamps, this has led to the aforementioned error message. It's also completely implausible that no pressure is measured at the rear when the front brake pedal is pressed

One should therefore add the error text to the knowledge base in the following way:

Error Code: 741

Brake Pedal Monitoring - Unplausible Signal

Possible Causes:
Brake light switch (F) is faulty
Brake Pedal Switch (F47) - Defective
BOTH HEADLIGHTS DEFECT

Replaced both lamps and now everything is working, including. Tempomat also again

Let's make it amazing and have a wonderful Christmas.

Georg