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Topic: Interior Light (Read 1375 times) |
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Paulus
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Big and Ugly....DON'T MESS!!!
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Interior Light
« on: Apr 1st, 2006, 9:59pm » |
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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?
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Simmo
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I'm an OAP !
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Re: Interior Light
« Reply #1 on: Apr 1st, 2006, 10:33pm » |
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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.
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Paulus
Full Member
Big and Ugly....DON'T MESS!!!
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Re: Interior Light
« Reply #2 on: Apr 1st, 2006, 10:42pm » |
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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?
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Paulus
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Re: Interior Light
« Reply #3 on: Apr 2nd, 2006, 7:34pm » |
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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.
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Interior Light
« Reply #4 on: Apr 2nd, 2006, 11:23pm » |
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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?
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sector-9
Senior Member
No scorpio anymore
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Re: Interior Light
« Reply #5 on: Apr 2nd, 2006, 11:46pm » |
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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
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Paulus
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Re: Interior Light
« Reply #6 on: Apr 3rd, 2006, 7:11am » |
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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.
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Jim
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1996 2.3 115k and rising
Posts: 121
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Re: Interior Light
« Reply #7 on: Apr 3rd, 2006, 9:08am » |
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I think the 12 second version was on the old sierra, so it is probably a replacement.
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Jim
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Interior Light
« Reply #8 on: Apr 4th, 2006, 9:46am » |
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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.
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Paulus
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Big and Ugly....DON'T MESS!!!
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Re: Interior Light
« Reply #9 on: Apr 5th, 2006, 11:10am » |
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Still no closer to resolving my problem.
Any more suggestions?
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Paulus
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Big and Ugly....DON'T MESS!!!
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Re: Interior Light
« Reply #10 on: Apr 6th, 2006, 12:38pm » |
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CAN ANYONE HELP ME
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Kjetil S
Senior Member
2001 BMW 520iat
Posts: 1419
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Re: Interior Light
« Reply #11 on: Apr 6th, 2006, 3:23pm » |
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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.
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Interior Light
« Reply #12 on: Apr 6th, 2006, 8:05pm » |
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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.
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mr._floppy
Junior Member
Posts: 100
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Re: Interior Light
« Reply #13 on: Apr 6th, 2006, 8:30pm » |
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Does it ( the interior light ) go out when you start the engine, and go on when you stop the engine ?
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Paulus
Full Member
Big and Ugly....DON'T MESS!!!
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Re: Interior Light
« Reply #14 on: Apr 7th, 2006, 5:58am » |
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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)
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sector-9
Senior Member
No scorpio anymore
Posts: 1069
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Re: Interior Light
« Reply #15 on: Apr 7th, 2006, 7:05pm » |
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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
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Paulus
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Re: Interior Light
« Reply #16 on: Apr 14th, 2006, 4:42pm » |
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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.
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sector-9
Senior Member
No scorpio anymore
Posts: 1069
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Re: Interior Light
« Reply #17 on: Apr 15th, 2006, 9:15pm » |
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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
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: Interior Light
« Reply #18 on: Apr 15th, 2006, 10:40pm » |
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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?
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Paul B
Senior Member
'98 24V Ultima saloon
Posts: 2442
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Re: Interior Light
« Reply #19 on: Apr 16th, 2006, 8:45am » |
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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.
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