Need some help here.

'94 GTS and the central locking does not work. Hit the button, no clicky, no locky.

Done so far.

Found a broken wire in the loom of the drivers door. Fixed wire.

Pulled Central unit and tested with known good one. No fixed. I tested for power to the unit and there was no joy there also so the hunt for fuses commences and no avail on this. Nothing in the CE, nothing tucked behind, above, under, or inside the CE that would have fuses for this unit. I do know on earlier models that there are two fuses for the locking system that have an amperage .400 (tiny fuse) and Rog thinks he has them on his '93GTS, as do I in my '88. This is an alarm car. The key does not close all windows/sunroof when held in locking position.

Now the question, where the hell are they? Looking at the 94 diagram didn't tell me anything so I'm hoping that one of you guys can lead me to an answer. I'm going blind looking at a the books AND the PFD files of the wiring diagrams.

I'm wondering if the alarm system has been bypassed and this causes the entire system to not work. If so, where do I start?

 

I think I just answered my own question when I posted that. As I thought it through in posting, it dawned on me that those small fuses wouldn't be present in a car equipped with the Porsche alarm system, since they are all integrated.

Therefor I need to trouble shoot the alarm system and go from there.

 

Yes - under the passenger seat...

Can you be more specific about what doesn't work...

Alan

 

Alan,
Nothing works and we do not have power to the module under the seat.
Tomorrow Sean is going to pull the seat so we can check it out.

Do you know when the cars stopped the 2x .4ma fuses behind the CP?

Thanks,
Roger

 

Not sure about the power to the module under the seat, I do know there is no power going to the locking button on the center console.

 

88 was the last year for the 2 fuses. Check fuse 17. Do your hazards work ? There are several wires that come from bus 15 and bus 30 in ce panel to alarm control unit. Is the central locking the only thing that's not working ?

 

The option to roll up the windows from outside the car, key in the door, is inop. (never tried the alarm) That was the owners 1st indication that something is wrong, I noticed the, in car locking was out, so have been trouble shooting from there. I went the wrong route and was looking for those twin .400's and didn't see them anywhere. Didn't dawn on me until posting the 1st post that it was all interconnected.

All CE fuses are in good working order.

Going to yank the passenger seat and see what's connected, if anything. If that's the case, cool. I'll update as I find out more tomorrow.

 

There is also a fuse on the control unit.

 

Yup, it's fine. Leads me to think the control unit under the seat is the next step. It's just a matter of tracing it down.

Thanks buddy.

 

On mine the alarm/lock/interior light control unit under the pass seat has an auto reset circuit breaket - not a fuse.

If either plug is pulled pretty much all functions are disabled (possibly due to previous alarm issues?).

Alan

 

Got to the unit today and found the 15amp fuse was blown. So I put in a new one. POP, it blew.

So I read up on the diagrams and the only thing we have not been able to check so far, is the passenger door wiring harness. I'll get to that tomorrow.

So my question of the day is, what would be the cause of this fuse blowing in the alarm control unit? I figure a short, but kinda need Alans expertise on this.

Thanks buddy.

 

What wire did you fix in the door ?

 

One of the hundred that were in there. Didn't trace it back to it's roots but it did cross my mind tonight that I needed to find out where it goes. Gray w/ green stripe.

 

The other night you said the fuse in the unit was good. The only gr/gn wire I can find in the door so far is for the mirror. You will have to locate the short. Unles it is easily found, you might have to disconnect induvidual circuits to isolate. Do you have a short finder ?

 

Sean I would suggest that you check the harness as it comes out of the sheath and into the inside of the door, I just finished working on S4 and the harness was rubbed in such a way that atlkeast 4 of the wires had gotten bare spots, so I cut the harness sheath back a bit and wrapped the wires and then rewrapped the harness with some vulcanising tapea. Also i reposisioned the harness inside the door This was the driverside door. I would also remove the console covers and see if possibly one of the wires may have gotten pinched in a stereo install, and the hatch connection for a shorted wire