Interior lights Stay On-1999 c2 cab

[dcdrechsel]

I am stumped -the interior lights do not go off .The alarm unit is apparently functioning correctly -no beeps on locking .The windows drop when the doors are opened and raise when doors are closed -which suggests that the right signals are being sent to the alarm unit .

Looking at the wiring diagrams -the interior lights are controlled via the alarm unit and I have no clue on the logic used .There are no fault codes being triggered .Does anyone have any ideas ?

It's not the dome light switch -already checked that .

[Loren]

How long do they stay on?

Normal is up to a minute or two.

[JFP in PA]

I am stumped -the interior lights do not go off .The alarm unit is apparently functioning correctly -no beeps on locking .The windows drop when the doors are opened and raise when doors are closed -which suggests that the right signals are being sent to the alarm unit .

Looking at the wiring diagrams -the interior lights are controlled via the alarm unit and I have no clue on the logic used .There are no fault codes being triggered .Does anyone have any ideas ?

It's not the dome light switch -already checked that .

 

If they are staying on longer than Loren pointed out, one common culprit has been a bad ignition switch (electrical section), which is a simple and cheap DIY.

[dcdrechsel]

I pulled the bulbs after 1 hour (tried multiple sessions to make sure it wasn't a fluke ) . .Ignition switch was replaced last year -I haven't noticed any other flaky electrical issues to suggest the switch again .

[JFP in PA]

I pulled the bulbs after 1 hour (tried multiple sessions to make sure it wasn't a fluke ) . .Ignition switch was replaced last year -I haven't noticed any other flaky electrical issues to suggest the switch again .

 

Have you scanned the car with a Porsche specific tool?

[dcdrechsel]

Yes-Durametric -no codes .Unfortunately Durametric pulled the input signals code due to unreliable data which makes it nearly impossible to figure out if it's ; a bad relay , a bad input or a code issue ..

[JFP in PA]

Yes-Durametric -no codes .Unfortunately Durametric pulled the input signals code due to unreliable data which makes it nearly impossible to figure out if it's ; a bad relay , a bad input or a code issue ..

 

Can you elaborate on your comments?  I'm not exactly sure I understand what you are referring to here.

[dcdrechsel]

Sure -in addition to the trouble codes the alarm unit can be scanned for the status of the individual micro switches.Example door closed -door contact micro switch open .Door open -door contact microswitch closed .Great capability except not working right .

[JFP in PA]

Sure -in addition to the trouble codes the alarm unit can be scanned for the status of the individual micro switches.Example door closed -door contact micro switch open .Door open -door contact microswitch closed .Great capability except not working right .

 

Ah!  OK, that was going to be my next question, so unfortunately we have drawn a blank there.  Because of the number of possible individual switches involved, it is going to be cumbersome, to say the least, to test each one manually, as you would have to tear the car apart to do so.  Is there anyone else near you with a PIWS/PST II, Durametric, or Autologic system you could use to retest?

[dcdrechsel]

I was going to start calling around to find an Autologic shop .The local BMW shop has Autologic but only for BMW's -he didn't know anyone who had a Porsche capability .I live in New Hope, PA so there must be one someplace .The dealer is not an option .

My fear is that if Durametric isn't working nothing else will either .Code is Code .

The other thing is that with the alarm and windows working correctly it could be a circuit in the unit itself .If I disconnect the battery and reconnect the lights are out until I open the door .That part works it's the lights out that doesn't .