Audi A6 C5 - Red exclamation mark in brackets on FIS, I need a schematic

Hello

In an act of desperation, because I can't solve the problem, I turn to you because I already have a problem in the car.

I have an Audi A6 C5 after a lift, after turning the key and waiting a moment, a red exclamation mark appears in brackets by 3 beeps. Same as start the car - then right away. An exclamation mark may also appear while driving at different times.


Looking for a wiring diagram for something related to this exclamation mark, e.g. brake and assist system. Because it is a lifted car, for example, the diagram from C5 does not suit me anymore.

Regarding the exclamation point:
- the brake fluid level sensor is functional (it is the same with the plug unfastened)
- wear of bricks after lifts is signaled by an orange indicator
- the computer does not show any errors, I can connect to the ABS and read the speeds from the wheels, etc.
- the greater the frost and the colder the engine, the longer the exclamation mark is displayed while driving. For example, today, at about 8 degrees plus and a warm engine, the exclamation mark flashes after firing for about 15 seconds, in frosts after the night for about a minute.
- the computer shows the correct voltage on the ABS pump, there are no drops.

First of all, replace the burned out bulb, and secondly, connect the VCDS

Buddy, about the light bulb, I know it. Replaced.
I wrote that the computer did not show errors. I have used a few including VAC-Com.
This is precisely the problem that the computer is not logging anything.

bald_man wrote:

- the brake fluid level sensor is functional (it is the same with the plug unfastened)

Now go to the car and add the brake fluid.

The fluid was topped up, pulled out because it was too much.
With the plug unplugged, it is supposed to act as if it was in a state all the time. When it is closed, it is as if it was empty. When I call it, it always warns you about the lack of fluid.

This cable connects to ground. In the plug at the reservoir - brown mass, gray with yellow goes to the blue plug at the meter pin 29. The connection is also on the left post. The plug seems to be purple in color. Pin 10.

I was checking these cables.
I unplugged the plug from the tank and checked if it had a passage between the cables. When the meter was connected, there was a gentle transition to one side, like a diode. After unplugging the meter, there is no passage in the cables, i.e. they do not short-circuit.

Surprisingly, I did not find this cable in the post. Strange as if it fell directly into the blue plug in the meter. My hands are dropping already, what could it be.

And you can't unplug the same cables, unfortunately because they are in plugs with others, so some other things would also stop working. Unless there is moisture on these cables and circuses somewhere. I checked the plugs next to the post in perfect condition, unfastened and plugged in, no water. I isolated the wiper wheel and there is no insulation damage, they fall into a thick beam.
There is one more thing to disconnect the plug from the meter and call the meter whether there is a mass on this pin, on what returns from the brake fluid sensor and touch the cable.

If you failed to locate the faults, check the cushions under the engine, there was a sensor in the C5 after the lift ...

Despite many fights, I was unable to locate. I undressed the ABS, checked the connections, checked the voltage on the ABS controller, put the old battery and nothing.

It is supposed to be a sensor in the pillow or from some element and located right next to the pillow. What is this sensor supposed to indicate? Let me know how to check it ??

Yes, the sensor is in the pillow, its purpose is to inform you about the wear of the pillow ...
The easiest way is to check the cushions "mechanically", lift the car on a lift and see if it is damaged, probably every mechanic will do it ... I will only add that I had the same symptoms as yours, starting the engine and an exclamation mark on FIS, and the same when driving around corners when I hit a hole in the road.

Mieczu wrote:

Yes, the sensor is in the pillow, its purpose is to inform you about the wear of the pillow ...

You are the favorite for the Crap of the Month award.

Quote:

Mieczu wrote:
Yes, the sensor is in the pillow, its purpose is to inform you about the wear of the pillow ...


You are the favorite for the Crap of the Month award.

Since you are such a "genius" then maybe you will develop silly ones for us and not just brag?

From what it seems to me, it is not the sensor, but the entrance to the heater, which changes the temperature, causing the pillow to harden or soften. Interesting gadget.

There is a solenoid valve in the engine cushion to harden it, no vibration sensor or anything like that

And something like this could be detected by electronics that the solenoid valve does not work ??

Well, by the way, I will pick up the car and look at this plug and whether there is any voltage on the cables.

In the event of a valve failure, there will be an engine controller error: 17996-engine mount solenoid valves (N144 / N145) pen circuit p1588-35-10
But it does not cause the message to be displayed on fis

Has the problem been resolved?
I have the same case ... (A6 C5 1.9 TDI Multitronic 2004)

Hello

I have a similar problem, the display shows only a red exclamation mark and beeps 3 times. I noticed that there was no coolant in the tank (it was for a minute), it turned out that there was a broken connection, which caused a leak from the system. After replacing the stub pipe, new fluid was poured over it and now it is between min and max. For several days the message was not displayed, now when I start the car I get the above-mentioned message. As a rule, it happens when the engine is cold (the fluid level in the tank does not change all the time is at the same level). The level of other fluids is between min and max. Please help.

Battery strong? I had a case where there was too much voltage drop during the start-up and the fis was going crazy as well.

Regards

And I recommend checking your abs because they fall like flies. If there is no communication with the abs, the exclamation mark lights up on the fiche.

Hello

I fully charged the battery and then tried to start the engine, it started without any problems, nothing appeared on the display. By the way, I was checking the battery, it turned out that it is efficient about 30%. I have a battery with a capacity of 74 AH, you will have to prepare for replacement, the question is how to buy because from what I read, the battery should be selected according to the power of the alternator (the problem is that there is no nameplate).

To make it more interesting, the exclamation mark stopped appearing about 2 months ago.
Today I started replacing the bearing and pads.
On one side, the bricks had worn plates, and on the other side, bare plates and torn cables.
So it is possible that my facelift Audi signals the pads also in red.

The adventure turned out to be also when I started to replace the bearing and it turned out that it only comes with the hub as in newer models. And the car on the lift was waiting for the bearing with the hub.

I had the same symptoms - an exclamation mark, three beeps, periodically while driving, later it was displayed constantly. Diagnosis on the computer - no communication with the ABS controller. The controller was taken out and reconditioned to this plant: https://elektrobip.pl/. It came back after a few days and the fault is gone.

But you had a bug on your computer and there is nothing here, ABS is working fine. The car runs so far as far as I know and nothing else happened. So I had a cold February counter.