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There are a stack of relays behind the glove box. If you remove the glove box you will see a screw at either end of the fuse box. Remove these and the whole fuse/relay panel pivots down revealing the relays. The ident for each relay is printed on the rear of the glovebox.
If you have a passenger airbox then I don't know how you get in to them. I have but I'll figure it out if and when I need to get at them.
 

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Discussion Starter · #7 ·
Thank you all for your help , but I think it must be a capacitor rather than a relay,its purpose is to give a limited amount of light
after closing the doors,i cannot see a relay fulfilling this function.
 

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Might be a capacitor on later models (I've had this conversation with John W before) but on my 1986 900T8v its a relay (which probably has a capacitor in it) that controls the interior light (under back seat). My 1990 9000Carlsson also has a relay which I think is where Derek said, behind glovebox.
 

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Yes, Adrian and I debated this almost a year ago. I bought an "Interior Light Delay Relay" for my 900s lpt. The fitting instructions for this Saab part described its suitability for the 99, 900 and I think 9000.

Despite being called an "Interior Light Delay Relay" I determined that it was more likely a capacitor. The unit itself was a black plastic cylinder about eight centimetres in length, 1 centimetre in diameter. Two leads came from it - one clipped onto a wire to the button on the door that controls the interior lights going on/off. The other was earthed to the body.

I still have the fitting leaflet if anyone needs it in PDF?

HTH
/john
 

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Hi Mike,
Which year is your 9000?
I'll try to look up the wiring diagram,as i'm friendly with a specialist who has the Saab workshop manuals.
A friend had a '89 CD that definately had a delay relay that plugged in behind the glovebox, but Saab change things year on year.
 

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There may well be a capacitor but there must certainly be a relay as well - it would need to be one hell of a capacitor to keep the interior lights on for 15 seconds. What I reckon it does is holds the relay on for that time (i.e. until it discharges) or until the ignition is switched on. It would cerainly be cheaper and simpler than an electronic timer. I don't know if this is the set up on my car and I don't intend pulling it to bits to find out.
 

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The gadget John W has is indeed just a capacitor. No relay is involved as the unit is simply wired across the switched side of the interior light door switch to ground. The discharge from the cap is enough to keep the lights on for about 10secs. You can see them gradually fade out as the cap discharges. There's probably a current limiting resistor in series with it I suppose, but it's too late to think or do sums on the matter!
 

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No matter what/how, if the purpose of the question is to get delayed your interior lighting, simply buy one of these little capacitors (with app. 8-10 sec. delay). Will cost you £ 2. As mentioned, simply loosen the door switch and connect the red wire to the right door-wire and the black wire to the screw that holds the switch, so it's grounded. Your all set to go and it works beautifully on my 9000 CS!

Cheers!
 
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