Date: Wed, 23 Jun 2004 07:07:55 GMT From: Paul Halliday <pjghnospamyonder.co.uk> Subject: Re: Anyone seen brother Grunff lately?
in article 2jrq7pF138erlU1nospamberlin.de, Grunff at grunffnospam.com wrote on 22/06/2004 23:32: > Paul Halliday wrote: > >> What I found was that the two wires switch polarity depending upon the >> direction of the switch near the handbrake. That would appear to be a relay >> that does that. > > Why a relay? I've yet to see a 900 which uses relays. The later ones > which have 'one touch' down have a relay built into the switch pack. But > no separate relays. Okay. I do have the one touch down on the driver's side and when that function engages, I hear a click under the rear seat. Upon investigation, there are two relays there. In the Haynes wiring diagram, under "later 900 models", I can find the relay but the diagrams do not show the operation of the switch itself. One of the relays under the rear seat is the same layout and would appear to pertain to this function. >> Going back to basics, if I spike the other wire and connect >> that to ground I can get the window to move in one direction. That would >> suggest a bad ground - either at the relay or the switch itself. The relay >> is a little too complicated to my simple understanding ... And I went >> through a few fuses testing some theories about the ground at that point. > > Ok, so far so good, you diagnosis is spot on. Having established that the motor is functional, next step is to find the ground and trace from there. First to the switch and the from the switch to the motor, whichever route that takes. I'll pop the switch out tonight and have another go with the multimeter. >> According to the wiring diagram, there are three grounds. One must be >> permanent and the other two depending on the polarity, presumably. So, it >> must be the switch that is switching polarity, rather than the relay. I must >> say, since I've got the window up I've not looked at it again. I'll do some >> tests on the switch - I had hoped it was an easy "oh yeah, just re-do the >> ground here" kind of thing ... Grrr! As you say, I'm not keen to start >> pulling the car apart without asking a few people first :) > > I reckon the incoming ground on the switch is bad. Have you tries > swapping the switches? The switches would appear to push into the connectors only one way - I'll certainly have a go though. If that's the case, where is the ground point? I've pulled the switch panel out and removed the rear ashtray, but the looms seem to run off somewhere that I can't immediately see. Hmm. More investigations ... Thanks pal. Paul