Odd beeping noise.

Fox · Unread post by **Fox** » 31 Dec 2002, 22:35

After I'd given up for the night after spending 2 hours removing the water from the rear passenger footwell, I decided to move the car.
Everything was fine but once I'd finished, I turned the engine off whilst the lights remained on. An odd audiable warning sound started to sound - like a very slow siren (deeeeee daaaaaah deeeeee daaaaah), but the sound wasn't exactly loud, it sounded a little weak.
When I turned the ignition completely, the noise stopped. When I turned it and the lights back on, the noise returned. After somew playing about, I discovered the noise only occours if:
a) The lights are on
b) The ignition is in the position where the battery light is the only light showing.
If I go to the final stage before ignition, the noise stops. If I turn the lights off, the noise stops. The 'lights on' warning you get when you open the door continues to operate as normal and sounds different to this noise.
I've NEVER heard this noise before, is it really supposed to happen, and if so, why did it not happen before?
1994 Citroen Xantia SX 1.9 Turbo Diesel
147,500 miles

wheeler · Unread post by **wheeler** » 31 Dec 2002, 22:53

sounds like some of that water has got into the alarm E.C.U. (black box under passangers seat) or the brown multiplug under the carpet in the passangers footwell

Dave Burns · Unread post by **Dave Burns** » 31 Dec 2002, 22:55

Lights on warning, should sound when lights are on, ignition off, door open.
Dave

Fox · Unread post by **Fox** » 31 Dec 2002, 23:06

It sounds different to the warning I get when I open the door and leave the lights on - indeed if I do that, I get the usual warning and this unusual one providing the ignition is in the middle position...
1994 Citroen Xantia SX 1.9 Turbo Diesel
147,500 miles

frankie · Unread post by **frankie** » 01 Jan 2003, 19:00

I reckon it might be the central locking control unit-a look on the wiring diagram confirms that the buzzer has a connection to this. Mine is doing the same and this coincided with a thorough car washing. The interior lights went haywire at the same time and these are controlled via the central locking ECU. I think this ECU is located inside the driver’s door. Playing with the connections and applying WD cured it temporarily. I hope the French managed to make a better job of the microprocessor controls in all of their nuclear power stations (there are rather a lot of them)– but then again, look what happened to Ariane 5, whoops.
CITRON (SIC) xantia TD 95

Fox · Unread post by **Fox** » 02 Jan 2003, 00:06

Oddly enough I've not had this noise since the time I mentioned, and I've used the car a few times since...
1994 Citroen Xantia SX 1.9 Turbo Diesel
147,500 miles