can a bad microswitch blow a fuse ?

[eddieedmo]

Had a look at problem of tailgate lock not operating.Checked fuse 1 and had blown , replaced and tested sunroof all ok then tried lock and nothing and fuse had blown again.( same fuse for sunroof and tailgate lock but not for tailgate release switch in car ).So the issue is with the tailgate lock.My question is can a bad microswitch blow a fuse? or is it more likely a short in the wiring ?
Got some cup1 wheels fitted with m & s tyres on rear for winter so some success today , took for a run and they feel ok.

Nick []

 

[JamesO]

Do you mean the hatch operates from the front ok but when the key is used it blows the fuse?

 

[eddieedmo]

yes thats it.

Nick

 

[JamesO]

So not the motor then, I'd have to look at the diagrams and I don't have them with me. I guess its feasible that the switch is causing the issue. Pretty cheap to replace.

 

[eddieedmo]

the motor works fine from the switch by the drivers right leg.Strange that the actual key lock is fused seperately , infact there is no reference where the inside switch by the drivers right leg is fused maybe it isn't fused for a safety reason ?Maybe because it is a late S2 they were changing electrics for 968 but not updated fuse info ? pure speculation.
Will take the microswitch out and test/check.

Nick []

 

[zcacogp]

That sounds like a very odd set-up; having two different fuses for the same operation depending upon where it is activated from. I have my boot switch connected up to the alarm, so you can open the boot from the key fob, and I recall that the switching is done by a falling-edge trigger on a relay; you connect a connection to ground briefly, which activates a relay which causes the tailgate release motor system to revolve once. Given this set-up, I'm not sure how it could be fused separately to be activated from different points.

However, back to your original question, the microswitch will probably be a single-pole normally-open thing, and is unlikely to cause the symptoms you describe when it fails. But the problem can't be that hard to trace; a systematic poking around with a multimeter and a small screwdriver and you'll find the problem.

Best of luck with it.


Oli.

 

[eddieedmo]

Thats right Oli my tailgate lock is linked to the alarm system and that is working fine.The fusing for the interior tailgate release switch is a strange one , I can't find any reference anywhere to its fusing.
I will update when I find the problem
Thanks

Nick []

 

[Lowtimer]

ORIGINAL: zcacogp
That sounds like a very odd set-up; having two different fuses for the same operation depending upon where it is activated from.

Amen to that. On my car, both switches for the hatch lock depend on the same fuse, which is the same one as the sunroof works off. Fuse in - all three items work. Fuse out - none of them work.