Date: Tue, 07 Oct 2003 11:34:13 GMT
From: KeithG <noonenopsamhlink.net>
Subject: Re: 9000 courtesy light


Malcolm wrote: > On Sun, 5 Oct 2003 15:56:21 +1000, "pmg" <pmgnopsamytogroup.com.au> > wrote: > >>But the>diagram also shows the door courtesy light as being a >>simple circuit using>the switch to earth the circuit. So this is just >>a little weird!! > > > If the door light is controlled directly from the door switch, what is > the "clicking you hear when you operate the swithch manually? > Despite what the wiring diagram shows, it sounds like a rewlay pulling > in but the circuit is not being closed. > > It would not be the first time that a production change was made and > the specs caught up later. > > There is more to "Pragmatism" than William James explained. > > >>. When I press the switch on the hinge side door sill I hear a "click" >>coming from behindthe fusebox console under the dash, suggesting that >>someting is working (a relay?,a switch?). The globe and fuse are ok and if >>I earth out the black wire on the light the lamp comes on, the other wire to the light is permanently live. >>The switch on the door sill has two wires. One is live, the other not. >>I can't work out how this works!! (It's obviously not simply a switch that >>creates a circuit and lights the lamp) > > > It sure sounds like the light is connected to ground (earth--This is > a very bad bit of engineering--switching the ground(earth) side of any > load) by a relay which is operated by the circuit completed by the > door switch. > > Malcolm > Actually, it is not so bad... If it grounds instead of completing the circuit, you can use this event to key other items such as an alarm... The relay you hear clicking is probably the one for the power seat. There are 2 things activated by the door switch. One allows the seat to be adjusted when the door is opened and the other grounds the dome light circuit to trigger it. When it looses a ground, it tells it to fade out unless the ignition is switched on, in which case it goes out immediately. Try pulling the switch in the car. I think there are 2 circuits on the switch, but am not sure. Try replacing the switch. These are not the most robust. I think they cost 15.00 or so at saabsite.com. KeithG

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