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        General >> Problems >> Interior Light
        
(Message started by: Paulus on Apr 1^st, 2006, 9:59pm)

Title: Interior Light
Post by Paulus on Apr 1^st, 2006, 9:59pm

My interior light (the one in the roof) only work when switched on. They don't work on the 20 sec timer position. All other lights are OK and the door switches are fine. No other electrical problems with the car.

Any suggestions?

Title: Re: Interior Light
Post by Simmo on Apr 1^st, 2006, 10:33pm

Try checking the battery saver relay R16 in the auxillary fusebox. Go to to 'fault finder' and see 'electrical concerns'. Here http://www.fordscorpio.co.uk/faultfinds.htm.

Title: Re: Interior Light
Post by Paulus on Apr 1^st, 2006, 10:42pm

I've done that. It clicked when I re-inserted it into the fusebox, so without actually ripping it apart, does it sound like it is working?

Title: Re: Interior Light
Post by Paulus on Apr 2^nd, 2006, 7:34pm

I've now tested the relay properly. It works fine.

Any other suggestions? I leave for work at 4:30am. It would be nice to see a few things.

Title: Re: Interior Light
Post by jonnycab on Apr 2^nd, 2006, 11:23pm

You've got a 20 second timer ?...... mines only 12.
Have you checked the switch contacts in the light itself. It was always a common problem on older Fords, so why no not newer ones?

Title: Re: Interior Light
Post by sector-9 on Apr 2^nd, 2006, 11:46pm

According to the wiring diagram, fuse F24, a relay and a 'link' are fitted to the large fusebox and power the interior light control circuit. There is also a central timer module but I think this is less likely to be the fault.

Not sure what number the relay is, or in which 'relay position' the link should be fitted - check the manual and make sure any relays and links shown are fitted in the correct places. Obviously you won't have relays for options which aren't fitted to your car, so not all the positions will be populated...

Darren

Title: Re: Interior Light
Post by Paulus on Apr 3^rd, 2006, 7:11am

I will do some more checking. It is Ultima spec, so it should do it. :-/

Jonnycab, I presume it's a 20 sec delay - that's what it says on the light.

Title: Re: Interior Light
Post by Jim on Apr 3^rd, 2006, 9:08am

I think the 12 second version was on the old sierra, so it is probably a replacement.

Title: Re: Interior Light
Post by jonnycab on Apr 4^th, 2006, 9:46am

Yea, mine was an old one that the previous owner had replaced for some reason. The rear light was also the same. I've just got a couple of proper ones (with map reading lights) from the breakers for a tenner.

Title: Re: Interior Light
Post by Paulus on Apr 5^th, 2006, 11:10am

Still no closer to resolving my problem.

Any more suggestions?

Title: Re: Interior Light
Post by Paulus on Apr 6^th, 2006, 12:38pm

CAN ANYONE HELP ME???

Title: Re: Interior Light
Post by Kjetil S on Apr 6^th, 2006, 3:23pm

Could try backtracing the wires with a multi meter, checking where the power stops (starting with the connection to the light itself). Sorry I can't help you more, but I don't know much about the wiring to the roof light.

Title: Re: Interior Light
Post by jonnycab on Apr 6^th, 2006, 8:05pm

Have you tried buying another light from the breakers (between £5 & £10) & putting it in to see if it works. It's a reasonably inexpensive way of ruling out the light itself & if it works, then hey.... you've got a working light.

Title: Re: Interior Light
Post by mr._floppy on Apr 6^th, 2006, 8:30pm

Does it ( the interior light ) go out when you start the engine, and go on when you stop the engine ?

Title: Re: Interior Light
Post by Paulus on Apr 7^th, 2006, 5:58am

Nope. The 20 sec feature has the same effect as pulling the plug. It only switches on when I the rocker switch in the "on" position.

I don't think that it is the light itself, because both front and rear units are functioning the same (or should I say not functioning as they should)

Title: Re: Interior Light
Post by sector-9 on Apr 7^th, 2006, 7:05pm

Have you tried checking the fuse & relay I mentioned? Also try bypassing the relay (i.e. manually bridge the contacts) to see if that brings on the light- if so you know it's a duff relay or in the circuit that switches it (such as the timer module). If still no light with the contacts bridged then you'll need to check the feed to the relay 'live' contact, and continuity between the ouput contact and the timed position of the interior light switch.

Two things will help you enormously here: a) being able to wield a multi-meter and b) being able to read and understand the wiring diagram. With both of those and some patience you'll either be able to find the exact location of the fault, or know enough to bypass it!

Darren

Title: Re: Interior Light
Post by Paulus on Apr 14^th, 2006, 4:42pm

OK.

Things tried so far....
1. Checked ALL fuses in fuse box - only one blown was for the heated screen.
2. Checked the realy by taking it out and putting 12v across the terminals and checking for a connection between the other two teminals...all is well.
3. Checked the voltage across the relay coil in the fuse box - there is a constant 12v even with the doors open or closed. It never seems to click off (is this normal?).
4. Checked voltage across the fuse - constant 12v (presumably this is supplied by the relay or vice-versa).
5. Tried another light - same result.
6. Checked the switches in the light units using a multimeter - all is well on both tested units.
7. Checked door switches - all is well.
8. Checked for power at light unit plug - 12v at "normal" supply and nothing on the 20 sec supply.

Without ripping the dash out to follow the wires, can anyone let me know where the connections along to cable route are so that I can check for dis-connected bits.

Other than that, anything else I can try?

Paul.

Title: Re: Interior Light
Post by sector-9 on Apr 15^th, 2006, 9:15pm

Well I'm out of ideas, but the central control module is above the engine ECU - both are behind the glovebox and can be unclipped and pulled out.

Darren

Title: Re: Interior Light
Post by jonnycab on Apr 15^th, 2006, 10:40pm

With no 12v supply to the 20 sec timer it is possible that the wire has been shorted/broken at some point. Have you done any interior work in the car at all recently?
If it's only the 20 sec timer that isn't working then the last thing I would consider would be a control module fault, especially as your puddle lights seem to work.
P.S. Sorry if this has been asked before, but you have checked the power saver fuse & relay?

Title: Re: Interior Light
Post by Paul B on Apr 16^th, 2006, 8:45am

There's a special procedure for testing the timer module. Trouble is, I can't remember how to do it now! :-[ Sorry but its been a while since doing it.
I'm sure a couple of the other old hands will know.

Title: Re: Interior Light
Post by meg on Apr 16^th, 2006, 9:24am

to check ctm,press heated rear wind switch turn on igntion,hold for approx 15 secs let go,chimes will let you know your in test mode,try opening door ,or any other switch that is controlled by ctm,if you get chimes would rule out ctm,exit turn off ignition.have you tried relay R5 in the central fuse box(says for heated rear screen)but works intrior lights,and have you taken out fuse no36 10amp aux f box,replace with a different fuse even if it looks ok,has worked before as paulB might remember.his where not working in june 2003 and we went all through circuits,and this was the problem.ps to paul your right it was 03,never had my specs on ;D

Title: Re: Interior Light
Post by Paul B on Apr 16^th, 2006, 9:32am

:) I do remember well, and these days fuse 36 would be my first port of call. Possibly replace even if it looks ok.

And that was the procedure I was talking about. Thanks for that :)
Hope it helps this time around too.

EDIT

Quote:

paulB might remember.his where not working in june 2005 and we went all through circuits,and this was the problem

I think it was a year or so earlier than that. You are an old hand aren't you? ;)