Wiring boot release to after market alarm w202 facelift
It’s a bit difficult without pictures, my understanding of the boot lock is that when you slam the boot shut, the boot is locked and the only way to open it (apart from key blade) is with the switch on the console or the button on the fob, when the switch or the fob button is used it triggers the vacuum pump to run and releases the boot latch, I don’t think there is an electric motor involved? that’s why we need pictures.
So, if you cant tap into the console switch then you could tap into the electrical connections that go into the vacuum pump, the vacuum pump is probably the correct place that the aftermarket alarm boot release wire should be connected.
If my assumptions, above, are correct then you should hear the vacuum pump run when you unlock the boot?
The two wires you mention at the boot lock are probably just to tell the Red light in the console switch that the boot is open or rather, that the boot lock mechanism is in the unlocked position.
Dec
So, if you cant tap into the console switch then you could tap into the electrical connections that go into the vacuum pump, the vacuum pump is probably the correct place that the aftermarket alarm boot release wire should be connected.
If my assumptions, above, are correct then you should hear the vacuum pump run when you unlock the boot?
The two wires you mention at the boot lock are probably just to tell the Red light in the console switch that the boot is open or rather, that the boot lock mechanism is in the unlocked position.
Dec
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That clarify that then, when you slam the boot shut the boot is locked and the boot latch is “cocked” and ready to be triggered by the vacuum actuator in the boot lock, so, when you press the boot release switch/fob you run the pump, that’s where your wire belongs, it has to be taped/spliced onto one of the vacuum pump wires… the one you must have missed, mind you , the boot would have to be shut and probably the aftermarket alarm would need to be armed in order to find the correct wire.
Is there an online wiring diagram/installation manual for the aftermarket alarm?
Dec
Is there an online wiring diagram/installation manual for the aftermarket alarm?
Dec
These diagrams aren’t all that reliable, the closest is 1997, Pneumatic pump… http://www.autolib.diakom.ru/CAR/Mercedes-Benz/1997/C280/SYSTEM WIRING DIAGRAMS/6173.pdf ... maybe BRN/WHT ???
Dec
Dec
I think the above should be VIO (Violet) and not BRN/WHT??
Also… http://www.autolib.diakom.ru/CAR/Mercedes-Benz/1997/C280/SYSTEM WIRING DIAGRAMS/6158.pdf
Dec
Also… http://www.autolib.diakom.ru/CAR/Mercedes-Benz/1997/C280/SYSTEM WIRING DIAGRAMS/6158.pdf
Dec
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Hi,
Boot mounted IR recieved was on the real early early pre-facelift 202 instead of the door mounted item.
Boot mounted IR recieved was on the real early early pre-facelift 202 instead of the door mounted item.
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If indeed the PSE pump runs to release the boot, then you will have go through each of the cables to the PSE pump in turn to see which one is live or gets earthed out when you activate the boot release switch or button on the fob.
I have had a go with a multi meter and with a prope but couldn't find the wire on the PSE. When i used the mutli meter each was showing a slight change in voltage once i pressed the button on the key fob. And when i use the probe to check if there is any change in current positive or negative but nothing changes?
If the boot lid was open when you were doing that then the circuit you are trying to find may have been dead and the Red light on the console switch may have been on, what I mean is that the car knows the boot is open and so doesn’t respond to your request to open via the console switch or remote fob.
How many buttons are on the Mercedes remote, lock, unlock and boot open?
Dec
How many buttons are on the Mercedes remote, lock, unlock and boot open?
Dec
So the pump runs for 2 or 3 seconds and blows air into the boot lock actuator and unlocks the boot… which is already unlocked and open, you still have to find which wire was responsible for that action, is there a Violet wire going to the pump? Violet is mentioned in both diagrams.
Big diagram… REMOTE TRUNK RELEAS SWITCH VIO (Violet) goes to pump.
Small diagram… REMOTE TRUNK RELEAS SWITCH VIO (Violet) goes to pump.
Dec
Edit, I know those diagrams may not be accurate in relation to your car, but that’s all you have to go on at the moment.
Big diagram… REMOTE TRUNK RELEAS SWITCH VIO (Violet) goes to pump.
Small diagram… REMOTE TRUNK RELEAS SWITCH VIO (Violet) goes to pump.
Dec
Edit, I know those diagrams may not be accurate in relation to your car, but that’s all you have to go on at the moment.
Last edited:
- Joined
- Nov 27, 2004
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- 65 Plate E350 CDI Convertible, 2006 CLS 55 AMG, 1997 C230K, 1999 C43/55 AMG
Hi,
I will admit I have always believed the boot release was electrically operated, with the central locking on vacuum as it is in the prefacelift cars, and when you disconnected a plug on the boot catch this seemed to be the case, as I can,t think why there would cables to the boot catch unless it was for a release solenoid. But I tried the fob and there is a noise from the catch and from behind the boot panelling but it is only for a brief moment and to say it is the pump running I couldn't say.
Writing this has made me think about it in a different way, I,m wondering as the boot locks/unlocks with the locking but doesn't completely open yet when the boot release operates when the car is locked it must unlock the boot (pump operates vacuum locking solenoid), then I reckon an electrical solenoid is used to release and open the boot.
The noise behind the panneling in the boot I reckon is the pump operating the central locking on the boot only to unlock it and the clicking in the catch an electrical solenoid to open the boot up, this solenoid would also provide feedback for the switch light.
This is only a speculation but it makes a lot of sense, in which case you would have to wire up the aftermarket alarm to both points.
To be honest I don,t see any advantage of having both systems operating the boot release, it won,t make it any more reliable (opening the boot) because the main components of the release system are still being used by both systems.
If I have time over the next few days/weekend I,ll have a look at mine.
I will admit I have always believed the boot release was electrically operated, with the central locking on vacuum as it is in the prefacelift cars, and when you disconnected a plug on the boot catch this seemed to be the case, as I can,t think why there would cables to the boot catch unless it was for a release solenoid. But I tried the fob and there is a noise from the catch and from behind the boot panelling but it is only for a brief moment and to say it is the pump running I couldn't say.
Writing this has made me think about it in a different way, I,m wondering as the boot locks/unlocks with the locking but doesn't completely open yet when the boot release operates when the car is locked it must unlock the boot (pump operates vacuum locking solenoid), then I reckon an electrical solenoid is used to release and open the boot.
The noise behind the panneling in the boot I reckon is the pump operating the central locking on the boot only to unlock it and the clicking in the catch an electrical solenoid to open the boot up, this solenoid would also provide feedback for the switch light.
This is only a speculation but it makes a lot of sense, in which case you would have to wire up the aftermarket alarm to both points.
To be honest I don,t see any advantage of having both systems operating the boot release, it won,t make it any more reliable (opening the boot) because the main components of the release system are still being used by both systems.
If I have time over the next few days/weekend I,ll have a look at mine.
- Joined
- Nov 27, 2004
- Messages
- 4,800
- Location
- Southampton
- Car
- 65 Plate E350 CDI Convertible, 2006 CLS 55 AMG, 1997 C230K, 1999 C43/55 AMG
Hi,
I will admit I have always believed the boot release was electrically operated, with the central locking on vacuum as it is in the prefacelift cars, and when you disconnected a plug on the boot catch this seemed to be the case, as I can,t think why there would cables to the boot catch unless it was for a release solenoid. But I tried the fob and there is a noise from the catch and from behind the boot panelling but it is only for a brief moment and to say it is the pump running I couldn't say.
Writing this has made me think about it in a different way, I,m wondering as the boot locks/unlocks with the locking but doesn't completely open yet when the boot release operates when the car is locked it must unlock the boot (pump operates vacuum locking solenoid), then I reckon an electrical solenoid is used to release and open the boot.
The noise behind the panneling in the boot I reckon is the pump operating the central locking on the boot only to unlock it and the clicking in the catch an electrical solenoid to open the boot up, this solenoid would also provide feedback for the switch light.
This is only a speculation but it makes a lot of sense, in which case you would have to wire up the aftermarket alarm to both points.
To be honest I don,t see any advantage of having both systems operating the boot release, it won,t make it any more reliable (opening the boot) because the main components of the release system are still being used by both systems.
If I have time over the next few days/weekend I,ll have a look at mine.
I will admit I have always believed the boot release was electrically operated, with the central locking on vacuum as it is in the prefacelift cars, and when you disconnected a plug on the boot catch this seemed to be the case, as I can,t think why there would cables to the boot catch unless it was for a release solenoid. But I tried the fob and there is a noise from the catch and from behind the boot panelling but it is only for a brief moment and to say it is the pump running I couldn't say.
Writing this has made me think about it in a different way, I,m wondering as the boot locks/unlocks with the locking but doesn't completely open yet when the boot release operates when the car is locked it must unlock the boot (pump operates vacuum locking solenoid), then I reckon an electrical solenoid is used to release and open the boot.
The noise behind the panneling in the boot I reckon is the pump operating the central locking on the boot only to unlock it and the clicking in the catch an electrical solenoid to open the boot up, this solenoid would also provide feedback for the switch light.
This is only a speculation but it makes a lot of sense, in which case you would have to wire up the aftermarket alarm to both points.
To be honest I don,t see any advantage of having both systems operating the boot release, it won,t make it any more reliable (opening the boot) because the main components of the release system are still being used by both systems.
If I have time over the next few days/weekend I,ll have a look at mine.
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