Durametric and Alarm system: Follow up question

[cbonilla]

Follow up question. Is it possible, in the absence of the official Porsche tool, to diagnose which circuit is not showing as closed using a multimeter? Time consuming, I know, but if its not too time consuming its probably less time than a dealer visit just for this. Are there any circuits which have shown themselves as more likely to be problematic

 

Thanks again

[Loren]

The Porsche testers will tell you precisely where the fault is down to zone level.

So it is up to the technician to investigate whether it is a switch or sensor issue or a wiring issue.

In my experience -- unless some after market equipment was added the causes are most often the switch or sensor in the faulting zone. Usually a relatively easy fix.

[cbonilla]

I agree, the fault is likely in the switch or sensor (I assume that when you say "sensor" you're referring to the motion sensor at the top of the windshield?). When I have a moment I'll start checking the different possibilities. Are these typically separate switches/sensors or are they incorporated into a larger mechanism.

 

Can you point me to a wiring diagram for the different switches?

 

CB

[Loren]

They all report back to the central locking/alarm control unit.

We will not publish the alarm diagram here for security reasons.

[cbonilla]

Thanks, I understand your reluctance to publish a wiring diagram for the alarm system. 

 

Without violating that, can you educate me on how the (for example) the front hood lock works. I assume there is a (pair ?) of wire sending the lock/unlock function (presumably from the central locking system/alarm. Is there a second set of wires telling the alarm module that the trunk is open(ed)?

 

In other words is it a simple circuit for lock and status? Or a complex circuit like a LAN?

 

CB

[Loren]

Remember there is a control box with ECU and circuitry to control alarm functions, door locks, and certain lighting.

So alarm sensors and switches are going to signal the ECU are going and change of state.

 

(click to enlarge)

[cbonilla]

Thanks Loren. I'll see if I can figure out that wiring diagram and decide whether to proceed. I don't want to just randomly change parts

In your experience are any of the switches more likely to fail than others?

Carlos

[Loren]

No not really. You need to know the alarm fault codes to pin down the problem zone.

[cbonilla]

Thanks again for the education

 

Carlos