Date: Tue, 7 Oct 2003 20:44:38 +0200 From: "MH" <nomailnopsamhere.no> Subject: Re: 9000 courtesy light
> 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!! Then if the switch connects the 'live' wire to ground there would be a = short circuit and some fuse should blow... Does the switch connect the = two wires or does it connect them both to ground? (The ground contact of = the switch may not be easily visible). The 'live' side of the switch is connected to the coil of the relay = (contact 85) The relay coil gets its power on contact 86, the light is = in a circuit with relay contacts 30/51 and 87 - yes? How did you measure the 'live' side of the switch? With a voltmeter or a = check light? If you used a voltmeter, then what you are measuring on the door switch = may not really be 'live' but the 12 V on the 'hot' side of the relay, = through its coil.=20 Since the voltmeter has a very high internal resistance it does not draw = a high current through the relay coil so there is no voltage drop over = it and the meter shows 12 V. The current through the coil and the meter = is not enough to make the relay work. If you connect the 'live' switch = wire to ground the relay should click 'on'. What happens If you use a test light between the 'live' door contact and = ground? If the contact is really 'live', the test light should come on = bright. ------------------------------------------- MH '72 97 '77 96 '78 95 '79 96 http://go.to/saab96 "pmg" <pmgnopsamytogroup.com.au> schreef in bericht = news:3f7fb287$0$10595$afc38c87nopsam.optusnet.com.au... > No, not the dome light. I have a wiring diagram here and it shows the = dome > light as being connected to the switch via a time delay relay. But = the >=20 > Pete >=20 > "Malcolm" <mwm1XXXnopsamedu> wrote in message > news:b3bvnvk5661umdmq8gsjkfamfe31cv89drnopsamcom... > > On Sun, 5 Oct 2003 10:02:47 +1000, "pmg" <pmgnopsamytogroup.com.au> > > wrote: > > > > >1995 9000 Aero. > > >The drivers door courtesy light (the light in the door itself) has > stopped > > >working when the door opens. The passengers side is ok. When I = press the > > >switch on the hinge side door sill I hear a "click" coming from = behind > the > > >fusebox console under the dash, suggesting that someting is working = (a > relay > > >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) > > >Anybody help me out here with how the system works or what is = likely to > be > > >wrong? > > > > > >Pete > > > > > This is definitely not the dome light that is giving you trouble. If > > this is so, then you have a bad relay which is "pulling-in" but not > > closing the circircuit. This is not an uncommon failure. > > > > Have you determined which relay is"clicking" and if so have you = tried > > shorting around it. If this works, replace the relay. > > > > Malcolm >=20 >=20
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