Door/hatch CLOSED sensing circuit
07-08-2016, 02:41 PM
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Door/hatch CLOSED sensing circuit
1983 US Spec
There is a pin switch in each door jamb, and a similar switch at the bottom of the rear hatch latch catch. These switches apparently serve to turn ON the interior lights, and perhaps in 928s with an alarm they trigger an alert.
On my car, add-on automation hardware senses that circuit to activate a "door open" warning. The OEM interior lights do NOT come on when the door opens, and the aftermarket automation brain DOES think a door is open. Apparently a short...
Can anyone provide the door/hatch switch circuit? And where in the car does the wiring from those switches connect to power, to the wiring to the lights?
Thanks!
There is a pin switch in each door jamb, and a similar switch at the bottom of the rear hatch latch catch. These switches apparently serve to turn ON the interior lights, and perhaps in 928s with an alarm they trigger an alert.
On my car, add-on automation hardware senses that circuit to activate a "door open" warning. The OEM interior lights do NOT come on when the door opens, and the aftermarket automation brain DOES think a door is open. Apparently a short...
Can anyone provide the door/hatch switch circuit? And where in the car does the wiring from those switches connect to power, to the wiring to the lights?
Thanks!
07-08-2016, 04:00 PM
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07-08-2016, 04:32 PM
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this?www.ligeti.com/928/
Those references begin with 1984 - my car is a 1983. Are they the same?
07-09-2016, 12:36 PM
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<i> Can anyone provide the door/hatch switch circuit? And where in the car does the wiring from those switches connect to power, to the wiring to the lights?</i>
This sentence leads me to ASSUME that you believe the door and hatch pins switch power.
They don't.
They switch the EARTH side of the interior light circuits - battery voltage is applied to the lights all the time, but there is no return path (and thus no current flow and the lights stay off) until the pin switches make contact or the switch on the light is moved..
Apologies if you already knew this.
This sentence leads me to ASSUME that you believe the door and hatch pins switch power.
They don't.
They switch the EARTH side of the interior light circuits - battery voltage is applied to the lights all the time, but there is no return path (and thus no current flow and the lights stay off) until the pin switches make contact or the switch on the light is moved..
Apologies if you already knew this.
07-09-2016, 01:18 PM
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Right. I saw the explanation (by Alan?) some time ago, and understood that it's earth that's switched.
That means there is probably an OPEN in one of the three sensing paths. Perhaps the circuit is fused. I hope to track it down today.
Thanks!
That means there is probably an OPEN in one of the three sensing paths. Perhaps the circuit is fused. I hope to track it down today.
Thanks!
07-09-2016, 02:28 PM
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All the switching for interior lights is on the ground side - the Brown/White wires are switched grounds.
All the interior light fixtures (bulb connection) get constant power - from where varies by year. On an '83 the source is fuse # 23.
If you monitor the Brown/White wire it will be at battery potential if the lights are off and ~Gnd when the interior lights are on. Any of the door pin switches or the hatch switch will cause all the lights to come on (in door switched mode).
Porsche stock alarms of that vintage do not monitor the door/hatch pin switches - they monitor the locks directly - they alert on unlock (and not disarm) - not when opening the doors.
Alan
All the interior light fixtures (bulb connection) get constant power - from where varies by year. On an '83 the source is fuse # 23.
If you monitor the Brown/White wire it will be at battery potential if the lights are off and ~Gnd when the interior lights are on. Any of the door pin switches or the hatch switch will cause all the lights to come on (in door switched mode).
Porsche stock alarms of that vintage do not monitor the door/hatch pin switches - they monitor the locks directly - they alert on unlock (and not disarm) - not when opening the doors.
Alan