Warning lights and buzzer absent post dash refitting

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frog
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Warning lights and buzzer absent post dash refitting

Post by frog » Tue Apr 22, 2014 11:14 am

Okay what did I forget (or break)?

Background: I've just had the dash out of the white one to do some welding and swap it into my black one.
Dash is back in the white one now, but I have no warning lights (stop or oil pressure) or warning buzzer when ignition is on or anytime. Everything else is working. Everything is reconnected I think!

Brake lights aren't working at the moment, but that could well be unrelated..

Any ideas?
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Re: Warning lights and buzzer absent post dash refitting

Post by frog » Wed Apr 23, 2014 2:35 am

So it's started working again today first thing. Nothing has changed so I have no idea what's caused it. Hopefully it won't be an ongoing thing!
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Re: Warning lights and buzzer absent post dash refitting

Post by Defender110 » Wed Apr 23, 2014 8:34 am

I would say it has to be an earthing problem to affect all?
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Re: Warning lights and buzzer absent post dash refitting

Post by mat_fenwick » Wed Apr 23, 2014 9:28 am

That was my first thought too, but the oil pressure light is earthed via the pressure switch on the block. Without studying a wiring diagram I can't think of a common factor, although possibly an ignition switched relay on the fuse box?
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Re: Warning lights and buzzer absent post dash refitting

Post by frog » Wed Apr 23, 2014 9:36 am

Yeah, they're off again. I will let you folks know when I sort it. Off to study a wiring diagram (may as well try to read a book in latin!).
Hopefully I'm lot leading you down the garden path with the oil pressure light. It certainly doesn't come on with the ignition, and it does in my working 16 valve.
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Re: Warning lights and buzzer absent post dash refitting

Post by mat_fenwick » Wed Apr 23, 2014 10:19 am

Hmmm, I'm wondering if it's more than one problem. Certainly on UK models the lights-on warning is independent of the ignition so a failure of an ignition switched circuit would not affect it. Warning lights aren't fed by a relay (just the cooling fan) as I first wondered. Can't remember whether brake lights are on a permanent live supply.

All the red warning lights (apart from handbrake & alternator) are wired to come on with low oil pressure as a test function before the engine is started, so a break in the earth side of that circuit (i.e. from the bulb to the pressure switch) could cause most of your symptoms.
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Re: Warning lights and buzzer absent post dash refitting

Post by frog » Wed Apr 23, 2014 10:22 am

Thanks for your thoughts Mat, I will have a play about over the next week and report back.

The brake lights may never have worked, we have just bought this car in the last fortnight as a non-runner.
It's running now, only since we repaired where rats had eaten through parts of the engine loom..
But the warning lights were working pre dash removal and re-fitting so I think it's my fettling thats done it rather than the rodents.

Cheers,
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Re: Warning lights and buzzer absent post dash refitting

Post by electrokid » Wed Apr 23, 2014 9:04 pm

Possibly one of the multi-way connectors to the instrument panel not seated properly / offset slightly, or dislodged when re-fitting.
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Re: Warning lights and buzzer absent post dash refitting

Post by David » Wed Apr 23, 2014 11:10 pm

The red warning lights go though a brown connector behind the glovebox it has about 7 wires in it (roughly, can't remember exactly how many). If that was unplugged then they wouldn't work. But what warning buzzer isn't working? The only one I know of is the one for the headlights.

Are the brake lights plugged in at the pedal?
The brake lights normally work off live 2 in the ignition, & all the warning lights work off live 1 & the ignition itself is live 3. Just out of curiosity: are your electric windows, green dash illimination, map reading lights, wipers & indicators working? if so L2 is getting power (there is more on that circuit but can't think what right now). Is the heater working & do the clocks go up in the instrument panel? if so L1 is getting power.

If the above checks show some of the mentioned things working & the mentioned plugs are connected then then it could be a broken earth somewhere. If not then it could be your ignition switch or a broken live, or even a blown fuse or 2.
You will probably have to get the meter out & check everything anyway.

Hope that helps.
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Re: Warning lights and buzzer absent post dash refitting

Post by frog » Thu Apr 24, 2014 12:14 pm

Okay, took some photos of the cars together last night as seen in the Gallery section and got the rear brake lights working by fettling around at the actual lights.

The warning light buzzer is the same (but separate) as the buzzer that alarms for the headlamps, it is also located in the same place. I have the next few days solid at work so I will investigate after then. I think it is likely to be a bad earth as others have mentioned or I have missed reconnecting an earth all together.

Thanks for all the suggestions so far. I will check that brown connector behind the glovebox, all the fuses are intact. I have sprayed electrical clean and lube on the connectors at the back of the instrument panel.

Time will tell, thanks for all the pointers!
1989 Citroën BX 16v
1993 Citroën BX 16v project