Audi A3 2005 BKD - Brake Lights Ignition Delay and Constant On Issue with KL15 Relay

Hello, the ignition of the stop lights is off, the knocks do not press the brake pedal. When the ignition is switched on, they burn constantly. I changed 3 stop sensors, I noticed that after switching on the ignition the lights come on only after about 1.5 seconds (only when the KL15 relay switches on), after removing its lights go out. They do not go out after removing the fuses on the steering wheel. Comfort module released?

Any mistakes? Perhaps the clutch sensor?

There is one error and it concerns the stop light sensor / the spiral from the candles blinks when the ignition is switched on. What does the clutch watch have to do with it?

They hang on one fuse.

Have you checked the sensor by the catalog as it should be? As far as I remember, there are 3 types.

Added after 50 [seconds]:

And check the rear lamps carefully under the water account and the bulbs fitted in it

The body is a 3-door hatchback, an additional alloy is also on fire and looking at the diagram, the wires are separated from the rest.

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They only have mass in common, but the pluses are separate.

Added after 5 [minutes]:

domex32 wrote:

Have you checked the sensor by the catalog as it should be? As far as I remember, there are 3 types.
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With the ignition off, the sensor is working properly.

Is the hook in the car?

The hook is gone.

Added after 2 [minutes]:

The stop comes on when voltage after ignition appears, I do not need to turn on the position lights. The rear wiper does not work in the car, I got to it and you can see large amounts of washer fluid that got on the rotor.

You need to determine whether the bordnetze exposes them or the lamps get electricity, e.g. from the windscreen wiper.

Check the wiring in the tailgate I once had such a case.

Bieda z nędzą wrote:

On my nose a 5A fuse was burnt in the box in the engine compartment, and burned by shorting the clutch sensor.

On Friday I will check and let you know, a very good idea!

Added after 30 [seconds]:

domex32 wrote:

They hang on one fuse.

Very important note.

The fuse from the clutch pedal sensor is all right.

So where do the lamps get electricity?

The lights go out when I disconnect in the fuse box:

F2 5A - Active steering controller;
F10 5A - MAIN RELAY 5A / Motor controller;
F12 5A - CENTRAL GATEWAY;
F28 40A - Relay 2 terminal 15 40A / Fuse box Interior;
Relay R1 458 - MAIN RELAY / Relay terminal supplied with 30;

F25 40A - the left brake light goes out - Left indicator / Parking lamp left / FOG LIGHT HEADLAMP left. / BODY CONTROLLER (BODY) / High beam bulb left. / Lion passing light bulb;

F26 40A - the right stop light goes out and the additional stop - Right indicator / Parking lamp right / FOG LIGHT REFLECTOR on the right / BODY CONTROLLER (BODY) / High beam bulb on the right / Low beam bulb on the right;

Added after 2 [minutes]:

domex32 wrote:

So where do the lamps get electricity?

It turns out that from the comfort module, while in the engine parameters I have the following:

Brake pedal - not depressed (changes to depressed as I depress the brake pedal);
Brake pedal / TEMPOMAT / - switched on (does not change after pressing the brake);
Clutch pedal - switched on (does not change after pressing the clutch);

If anything, not from the comfort module, but from bordnetz (central electrics module). You could look into it, maybe something will catch your eye.

domex32 wrote:

Have you checked the sensor by the catalog as it should be? As far as I remember, there are 3 types.

Check it out yet.

Can you define the moment when the failure occurred?

domex32 wrote:

If anything, not from the comfort module, but from bordnetz (central electrics module). You could look into it, maybe something will catch your eye.

domex32 wrote:

Have you checked the sensor by the catalog as it should be? As far as I remember, there are 3 types.

Check it out yet.

Can you define the moment when the failure occurred?

The one in the trunk on the right?


The client said it happened suddenly

It turned out that the fuse was burned the one that powers the clutch and alloy pedal but not 5A but 10A. Hence this mistake. Thank you all for valuable advice.

kubas10 wrote:

Thank you all for valuable advice.

In thanks, we use the "helped" button