completely flummoxed

[markyboy]

hi all I'm a newby to the site and have a problem . I have a 206 1.4 look and for some reson it wont work . the car was running but the exhaust was gone . it was parked up for maby 4 days till I got a new one which I put on and now it wont start . my mate has done some checks on it and it seems only one side of the fuse box is working , so I changed that but its still the same . turn on the key and the wipers , radio , heaters don't work also it does not bleep when the door is opened but it does lock / open the doors with the remote key . did a bsi reset but its still the same . had it on a snap-on diagnostic but its showing no faults , my mate who works with cars is (as I am ) at a total loss . please , please help ?????

[IanL]

Have you checked all the underbonnet fuses and superfuses, as well as those in the cabin?

[markyboy]

yes I went through them all as did my mate that's how I found only one side of the fuse box was working

[IanL]

Which fuse box - under-bonnet or cabin??

And which half? You need to give as much detail as possible.

Quote the last eight digits of the VIN - then we can pull up the details and circuits of your car.

[markyboy]

both fuse boxes were checked . as you look down at the fuse box under the bonnet it would be the left , the side closest to the battery ... 47765212.. vin . my mate did a Citroen with the same fuse box with water damage which he says is a common problem with them and on the 206 that's why I replaced the under bonnet fuse box . I did think it was the key as the battery was flat but I was using it a week or so before this using the door lock but maby the battery was not flat , flat if you get my meaning . put a new battery in and it locks/unlocks the car fine

[Capncol]

If it says eco mode in your centre binnicle, it would explain lack of radio, wipers etc:
If you fitted a complete exhaust, check you haven't knocked a wire off somewhere.

[Slo]

I would say its in eco mode too especially if youve had the ignition on for 20 minutes or so at some point trying to start it as the car will disable almost everything from working to preserve its battery power giving the impression its developed a fault but its quite normal.

[IanL]

Does the engine crank (turn when the starter is operated)?

What is the battery voltage with the ignition off?

Have you tried charging the battery?

[markyboy]

Yes it says eco mode on dash but I knewe that was to save the battery . Fully charged battery (12.5) checked under the car , no wires off . I've just checked the fuse again . Under dash fine however the ones under the bonnet like I said only one side working BUT the side that's working I've got a simple light tester on NEGATIVE side of battery and touch the fuse ....positive . If I put the tester on the POSITIVE side of the battery the left hand fuses are showing as a earth . Don't think that's right is it ???

[markyboy]

Also yes the engine turns over very well just will not fire

[iooiuk]

Also yes the engine turns over very well just will not fire

What is the V's when cranking over?

Seems odd that there is only power to one side of the fuse box.

Given you have changed the old one. Any chance you can meter the connections to see if they are all OK. If not that will give you a hint as to where the issue (knackered connection is)

I would have thought that the fuse box would have only one live feed, but than again it is a french car....

[IanL]

It looks like it is not a live feed that is missing, but that the fuses which are dead are fed by relays in the fusebox. The relays are driven by a large chip in the box which gets inputs (I think) from the 10-pin connector on the top of the box. Check this connector for mould, dirt, etc. Use a spray of contact cleaner (not WD40).

Just to make sure, please say the fuse numbers which are dead (not the values).

[markyboy]

fuses ...15,2,9,10,11,12 ..... I checked all the plugs because ive had scruffy contacts on other stuff ....its a 57 plate car I forgot to mention just in case that has any relevance ?

[IanL]

That confirms that the fuses which are dead are fed by relays which are controlled by the "brain" in the fusebox, and that is controlled by digital signals from the BSI.

As you have already changed the fusebox, either the wiring which carries those signals from the BSI is defective, or the problem lies in the BSI. I think you need to get Peugeot Planet diagnostic system onto the car - if the problem does lie in the multiplexing, that will be necessary to make progress.

[IanL]

Something to try - to check whether the problem is in the ignition key unit. The unit has three switches - the starter (that's ok because the starter works) and two which power the BSI. One of those powers the brake lights - so do those work when the ignition is on? The other powers the door locks, so we know that is ok.

If the brake lights don't work, put the BSI to sleep. (All doors shut, everything switched off and wait 3 minutes) Then (without opening a door) unplug the two pin connector near Fuse 22. Now switch the ignition to ON, and check that both pins in the connector (not the BSI) have +12V. If not, the problem is probably in the switch unit.

Switch OFF the ignition and replace the connector. Wait 10 seconds. Switch the sidelights on and off. You can now open the doors. You have now done a BSI reboot, so if both the pins had power, maybe the reboot has cleared the problem. If not, it looks like the BSI, or wiring.