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Help with electrical problems

I changed my driver side window regulator yesterday. I did not have any major issue installing the unit. I made sure that the window was operating properly before fully assembling the door panel.

An hour or so after finishing the project I tried to start the car but only heard clicking from the starter. I also noticed that all the interior lights were on and the window now will not go up all the way; it stops at the level that it normally drops to when you first move the door handle. The window also would not automatically go up or down. I know this normally happens after the battery is disconnected but it took 5 or six time operating the window manually before started to work properly vs. 2 or 3 times for the passenger side. Once the window went all the way up while the door was open but then immediately went back to the normal position.

I place a charger on the battery to get it started and went out for a ride figuring that the system needed to be reset because the battery was disconnected during the install and to also recharge battery. The interior lights stayed on the entire time.

I disconnect the battery, thoroughly cleaned all the contact points and fully charge the battery hoping that a weak battery was the problem. Not.

I connect my Durametric reader and received the code P1602 which I believe is from disconnecting the battery. I also received the alarm fault codes:

23 W lead

Status: not present Frequency: counter: 1

25 W lead

Status: not present Frequency: counter: 3

Anyone have similar issues?

I’m going to get a new battery a relatively cheap diagnostic expense.

Had battery tested; it was good. It’s only 3 years old.

Other strange related issues:

Interior lock switch doesn’t lock the doors and neither does the key fob.

I then locked the door manually and the window went up fully.

I then press the button on the key and I heard the locks engage, the headlights flashed and the interior lights went off.

I then pressed key fob button again the doors unlock and the window goes down slightly and stays there. If I press the button again the doors don’t lock and the horn beeps.

I then started the car and press the lock button and the doors locked. If I press the button again the car unlocks and the light in the button goes off but if I press it again nothing happens.

Edited by Lee Quave
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  • Admin

Fault code 23 -- W lead (DME - immobilizer), short circuit to B+

Possible cause of fault

- Short circuit to voltage in the communication lead between the alarm system control module and the DME control module

Fault code 25 -- No pin 86 S recognized

Possible cause of fault

- Pin 86 S is not detected when terminal 15 is switched on

- Fuse E1 faulty

- Short circuit to ground/open circuit in wiring between the alarm system control module and the ignition lock

- Ignition lock faulty

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Thanks Loren,

Everything was working fine before I replace the window regulator with the exception that the window would drop down when first pulling on the door handle. I disconnected the battery first and I didn’t have any problems with the removal or installation of the regulator or the door panel.

Everything is still works but, not normal

For example:

The window goes all the way up when the door is locked with the key and goes down when unlocked with the key and will go back up after getting into the car and closing the door but if I go to open the door again it will go down as normal but it will not go up again. The horn beeps once when I lock the door with the key.

If I press the button on the key the horn beeps once and nothing happens but if I lock the door with the key first and then press the button I can hear the locks engage, the interior lights turn off and the alarm indicator light flashes as normal. If I don’t press the button the interior lights stay on.

After locking the door with the key and then setting the alarm with the key fob button if I press the button again the doors unlock and the driver side window goes down a little and stays down.

I tried disconnecting the battery and removing fuses B8 and C3 hoping that it needs a reset to no avail.

Maybe it can be fixed with the Porsche PST2 or PIWIS tool?

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Did you check fuse E1?

Yes I did after your post. The fuse is good.

I’m going to remove the door panel again and check all the wires I can see for damage. If I don’t find anything it’s off to the dealer.

I will post the finding either way.

Loren, thanks for your help.

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  • 4 weeks later...
Yes, my guess is that something got pinched.

I replace the door micro switch (part # 99661312300) which is directly behind the door handle and now everything is working as it should.

I’m not sure what the purpose of the switch is however everything also worked after I unplugged the switch as suggested by bcr4d but I replaced it anyway since I need to repaint the inside door handle.

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