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That's how my car works. When I had a drain, my windows would still go down after the car was shut off and the door had been opened. After I replaced the switches, I no longer had a drain and my windows no longer go down after the door has been opened.
“There is a TSB from Porsche on reducing current draw. On non cabriolet models you remove the bulb in the clockfor the cab. top warning light. I think it is labeled bulb #2 but you can shine a light through the back after the bulbis out and see if you got the right one. I forget how many milliamps this reduces current draw.”
That's how my car works. When I had a drain, my windows would still go down after the car was shut off and the door had been opened. After I replaced the switches, I no longer had a drain and my windows no longer go down after the door has been opened.
Lots of threads on this:
Hi
Definitively a feature. I looked at my car manual (c2 90 // manual in german), windows can be operated with key out and door open. Playing with the switch the window relay activates with the lights
I looked at my car manual (c2 90 // manual in german), windows can be operated with key out and door open. Playing with the switch the window relay activates with the lights
Was your 964 originally delivered as a Japanese spec? The door wiring for the window switches is different for those models.
Interesting, mine is UK delivered 1990 C2 and owned for 18 years. Mine works as bricem13's.
Key out, door open, windows up and down, interior light on. Same for driver and passenger side as the relay is energised.
Key out, door closed, windows won't work as the relay is not energised.
Key to first position, windows work door open or closed.
This makes sense to me as you would not want the relay to be energised with the key out and the door closed or that would probably drain the battery.
The door switch is either open or closed so if it was bad i.e. switch contact closed (making the circuit) then the interior light would be on all the time. If it was contantly open then the interior light would never come on.
I see (and thought) this is a good feature as otherwise you would always have to turn the ignition on to open or close the windows.
Looking at the 90 wiring diagram it looks like it is working as it should or am I missing something?
Maybe it is an early feature and the later models were wired differently.
PS my last battery lasted 10 years so no too bad in my opinion
I think max battery discharge while off should be less than 100mA. If you have more than that there's probably a short to ground or malfunctioning electrical component (as many have already stated). Last resort, you can find some battery with over-discharge prevention.
07-20-2018, 06:27 PM
