Another 'Dash Lights On with No Key in' Problem (but no BSI)

[Pix]

Hi there,

Does anyone have a fuse box diagram and/or wiring diagram for a 1999 Berlingo diesel?

Went out to the van a few days ago and found all the dash lights on and the 'bee-boo-bee-boo' warning buzzer going without the key in, including the immobiliser warning light. Put the key in and the immobiliser light stayed on - couldn't start the engine.

Eventually got the engine started by taking the battery lead off/putting it back on a few times to get rid of the immobiliser light. After starting, all the dash lights went out (as normal) and the fuel and temp guages worked fine. Turned the ignition off (took key out) and the engine kept running. Pressing the footbrake (with the key out) stopped the engine. Selecting reverse also stops the engine (with key out) but sidelights, wipers, indicators etc on/off won't stop the engine.

Normally this might be a BSI problem, but there's no BSI in these vehicles - Haynes and the local Citroen dealer say BSI's were only fitted after 2001.

So looks like a problem with current backflow through another circuit feeding the ignition. Have checked all the main earthing points - both rear light earths, both 'A" pillar earths, O/side front inner wing and the 3 earths behind the fuse box in the engine compartment - and all are bright and clear (cleaned them up anyway). Have also unplugged both rear lights. Dash lights still stay on. Citroen dealer said to check for blown rear bulbs, but no bulbs are blown.

So took each fuse out one at a time until the dash lights went out - removing fuse 25 solved the problem.

Haynes (1996 - 2005) Berlingo wiring diagrams don't seem to cover the '99 Berlingo - it shows BSI fuses and wiring - the nearest is the Peugeot wiring diagrams which says fuse 25 is for interior lights, clock and air conditioning engine control unit (the van doesn't have aircon). The owner's handbook that came with the van shows (quote):

'According to model or country'
Fuse 25 - Control unit for coolant temperature / post cooling fan unit / injection ECU memory / diesel transponder - front/rear interior lighting - radio memory - clock

With fuse 25 out, the interior lights are dead, and the clock only works when the ignition is turned on with the key - which is odd, since if it's fed by that fuse (only) the clock shouldn't work at all.

With the interior lights disconnected (also the temp sensor on the rad unplugged) but speedo/clock unit connected, there's 16 ohms between the fuse feed (non-battery side) and earth. With the clock/speedo unit also disconnected (it's the 5 connector type, btw) the resistance to earth on the circuit increases to 1.6K ohms - but the 'bee-boo' warning buzzer still sounds when the fuse is put back in (with key out) so I'm assuming the clock/speedo unit isn't the (only?) problem.

Running out of ideas here, there has to be something else on that circuit (or a wiring fault somewhere) - has anyone got a fuse diagram (ie. what's on fuse 25) and/or wiring diagram for the 1999 Berlingo diesel so I can do some tracing?

I've had this van since it was 3 years old and never had any problems with the electrics before.

The info on the drivers 'A' pillar label is:

68239
10731
EWPA

I can email the VIN if that helps.

Thanks for any help or suggestions.