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Comfort Access- How does it work?
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01-28-2006, 12:48 PM | #1 |
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Comfort Access- How does it work?
How does it know you are the keyholder when you touch the handle? Is it possible for such a small device to send a signal through the body?
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01-28-2006, 01:33 PM | #2 |
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When I have comfort access on and am standing next to the door, my friend can go up to the door and unlock or lock it. It works in close proximity to the specific door.
With comfort access, the key fob also has buttons that function like the non-comfort access one. So you can still remotely open the doors and trunk with the key fob. If you are driving your car with the windows down, sunroof open and music playing, you can park, press the Stop button and the engine will shut off. The radio stays on. After you leave the car, tap the door handle and it will lock the doors and set the alarm. Hold it down longer and it retracts the mirrors (premium package). Keep holding it and the windows and sunroof close. |
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01-28-2006, 01:34 PM | #3 |
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No. My guess is that its some kind of sonar sensor that senses something in tha place or infrared sensors that sense the heat change. Then they try to see if the fob is within distance, then if it is, it opens the doors.
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01-28-2006, 01:36 PM | #4 | |
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01-28-2006, 01:37 PM | #5 |
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My hunch is that the sensors are not infrared or sonar, not light/heat or sound portions of the electromagnetic spectrum.
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01-28-2006, 01:38 PM | #6 | |
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01-28-2006, 02:08 PM | #7 |
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So, does it at least work to open all windows and sunroof if you hold down the "open" on the key fob?
Like on the e46.
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01-28-2006, 02:10 PM | #8 | |
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It sort of pisses me off when they remove these things. If you can open them remotely, why shouldn't you be able to close them? At least have the rain sensor shut the windows if it detects rain.
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01-28-2006, 02:12 PM | #9 | |
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01-28-2006, 02:17 PM | #10 | |
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Good to vent as you come upto the boiling E90 in the summer.
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01-28-2006, 03:17 PM | #11 |
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No, no infrared, no sonar
In the E90 there is a small shortrange transmitter in each front door and in the trunk lid When you pull a handle the transmitter sends out a request for a key ID The key on your pocket responds with its ID number whih is picked up by a antenna in the rear window. If the ID matches the dorr/trunk unlocks This all happens in less than 1 second The transmitter is very short range, so they key must be close enough to the door
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01-28-2006, 04:05 PM | #13 | |
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When I open the driver's side door with CA, the passenger cannot open the passenger door. The transmitter is very short-range and must be closer than that. If I'm a good boy scout and open the passenger side door first for my occupant (little old lady), the driver's side door unlocks simultaneously. Last edited by ksfrogman; 01-28-2006 at 04:23 PM.. |
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01-28-2006, 04:19 PM | #14 | |
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01-28-2006, 04:41 PM | #16 | |
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01-28-2006, 04:49 PM | #17 | |
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Poldim, sonar is a technique that uses sound propagation under water to navigate or to detect other watercraft. |
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01-28-2006, 04:51 PM | #18 | |
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01-28-2006, 05:00 PM | #19 | |
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Thats wrong simply for the fact that in order to activate my CA I have to slip my 4 fingers behind that handle, and while I havent touched the car, it already recognizes that I'm there, authenticates my key fob, and unlocks the car. I think its either done through eddy current sensors or capacitative sensors. These sensors work by creating an electromagnetic field and simultaniously senses changes in the field. As your hand is placed in the gap between the door handle and the door, the magnetic field changes and begins the authentication process. That would be my best guess.
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01-28-2006, 05:04 PM | #20 | |
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01-28-2006, 05:11 PM | #21 | |
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You are correct. I meant to say sonic motion sensor. Which is essentially sonar just does the same thing through air.
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01-28-2006, 05:20 PM | #22 | |
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Not sure if they allow hot linking:
LINK Quote:
Seems to support my logic since the door handle is $250 from a wholesale discounter.
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