'99 Dispatch: Can't change blower fan speed. Where does this wire go?

[kenbw2]

I suddenly lost the ability to control the blower's speed and have taken a look at the wires to see what's going on.

The fan is working, albeit on very low. If I remove the fuse it shuts off entirely. It is receiving the 14V feed.

I followed the wire from the fan speed control in the centre panel and found it's loose. It has 0-8V depending on what the selected fan speed is. I assume a passenger has accidentally pulled it out.

Where does it belong?

[Romzi]

I don't know your exact vecihle, but i assume there is control electronic module for blower where red and black wire is seen.
So your lost wire should go somewhere into the round box in the middle of your picture.

[xantia_v6]

Where the thick brown and blue wires appear to attach to the blower unit is actually a 4 pin plug, which should also carry the control signal.

The pictures here: http://www.citroenthai.org/diy/blower.html may be useful. (although you plug looks a bit different).

[kenbw2]

Hmm, so it's either the green or the black. I'd bet on the green but I don't fancy the gamble.

Does anyone have a similar one that can tell me what you see on yours?

[xantia_v6]

The circuit diagram of the speed control module (located in the blower housing) van be seen at: viewtopic.php?t=32797

You will see that the speed control is on pin 3, between Ground on pin 2 and the +12V on pin 4. Pin 1 is a temperature sensor which may not be used on some vehicles.


At 3 minutes and 3 seconds into this clip you can see the 4 pin connector with the plug removed, but this guy's camera work is so bad that you don't get and in-focus shot of the plug with the wires (you can almost see it at 1:51).

,

[kenbw2]

After seeing the schematics and details posted here I decided to check where the rogue wire goes on my 806 and Synergie. Unfortunately they have the neat plugs shown on the Thai site, so no help there.

Armed with the explanation here that one of the contacts is null, I figured it shouldn't destroy anything if I get it wrong. So i stuck the wire into the green socket, but nothing. Then jammed it in the black one, and suddenly the blower fired up. All fixed!

Thanks folks.

[Hell Razor5543]

Great news