Überwachung Kühlmittelstand realisierbar ?

Zitat von Endurance

I can tell you, that a low level came also during engine run on my MK I.

Confirmed.

MK1 and MK2 had purely analogue technique here. These level sensors were always "hot" with ignition switched on. They were directly wired to the display unit (auxiliary driver information module). This unit only made the time delay against erratic signals and then triggered the signalling bulb. That's it.

With the MK4 and above, the level switch is another input signal to the digital processor inside the BCM. All is software here. It needs to be tested if the mentioned input pin is already supportet by the software or not.

Zitat von Endurance

Coolant level OK => Circuit is closed

Coolant level too low => Circuit is opened

So if everything is fine, the circuit is closed.

So it can not be a signal to put the above mentioned pin 13 on ground. Or it is inverted somehow.

But that's exactly how it works. Sensors with electronic reading are always pinned to ground.

The BCM does not put high energy voltage out to the sensor, what would result in a shortage to ground if sensor is closed. The BCM only measures the resistor value (Ohm) to ground level using a very low-energized testing current like every common available multitester.

And with the switching method "all is well = circuit closed / something is wrong = circuit open", the extra benefit is that a broken cable also would trigger "something is wrong" and not leave the driver in false security that "all is well".

Maybe that function has to be enabled in the CCC to work. If disabled, the open pin 13 is simply ignored by the software then.

You must not fear to break anything. Car electronics is resiliant against faults of many kinds by desing. Just pull it to GND (chassis/earth) with ignition on an see if there is any change in the cluster. If not, check CCC settings (but i can't remember seeing something like this).

Zitat von Go4IT

by desing

=by design

Ich habe heute mein BCM getausch (RDKS Nachrüstung). Nun ist ein ...XB BCM verbaut, das hat die vollständige Ausstattung. Dabei habe ich auch ein Kabel in den Stecker A (grün) des BCM an Pos 13 gesteckt. Leider ohne Erfolg. Der Pin ist im BCM scheinbar nicht beschaltet. Ich habe die Leitung zur Sicherheit über einen 1kOhm sowohl nach Masse als auch nach 12V gezogen. Am Pin lag dann die volle 12V bzw Masse an. Das deutet darauf hin das der Pin offen ist.

Im Plan von apollogary steht zwar als Bezeichnung C13, das kann aber nicht stimmen. Am Stecker C ist der Innenkabelbaum, der Motorraumkabelbaum ist Stecker A.

In dem Plan sind auch die Anschlüsse TPMS LF (Front links) auf der C1-33/34 und RF auf C1-21/22 verzeichnet, in Wirklichkeit liegt LF auf A21/22 und RF auf A33/34. Es sind also nicht nur die Steckerbezeichnungen verschieden, auch sind die TPMS Antennen seitenverkehrt angeschlossen. Der Plan passt leider nicht zu den Europäischen Fahrzeugen.

Man müsste zunächst mal die im IPC gespeicherten Grafiken untersuchen ob es da überhaupt ein Icon für eine solche Anzeige geben würde.

Im IPC Testmodus gibt es kein Icon für den Kühlwasserstand. Da sind zwar welche dabei die ich noch nie im Echtbetrieb gesehen habe, aber keins für Kühlmittelstand. Das muss aber sicher nichts heißen, Vom Convers Mode her wissen wir ja das da noch einiges "schlummert"

Zitat von Go4IT

You would first have to examine the graphics stored in the IPC to see whether there would even be an icon for such a display.

I imagine it would be a message, like the low washer fluid level warning message, rather than an icon in IPC. And it is way above my knowledge how that message is constructed and sent/displayed.

Regardless, it doesn't look like it is possible. Sorry to get hopes up.

Everything is possible, it's just a matter of efforts. As Motral added some new tricks to IPC software, i guess it could also be done with this. There are a lot of unused pins in the IPC plug and it's very likely that one of them leads to an input of the microcontroller, an input which is not used for Mondeo. A programmer could pick this, create a custom handler and message for this.

Anyone know anything about Motral lately?