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Car Forum / Honda Cars / January 200501 Accord alarm/security, where to read wireless lock and unlock?
Hello, Does anyone know where I might be able to read the wireless FOB information? I'm basically looking to get indication when the keyless "lock" command is received, as is the keyless "unlock" command. I plan to run the signals into electronics for a project. If I were to simply grab the 12vdc going to the lights, that would be no good as it would be triggered at other times. Hopefully it can be had under the dash? Is there a module the controls the locks, and has separate inputs for lock and unlock and trunk from the wireless receiver? The more I think about it, a module to detect rain and roll up windows/shut sunroof would be handy also. TIY!!! > Hello, > [quoted text clipped - 13 lines] > The more I think about it, a module to detect rain and roll up > windows/shut sunroof would be handy also. I don't know the specifics of the 01 Accord, but in recent vintage Hondas the receiver is integrated with the door lock control module. Thus the lock and unlock signal pulses may not be easily accessible. You could read the door lock actuator wires instead. Each actuator has two wires (well, two wores that count, some times there are additional wires for switches inside the actuator), applying 12 V with one polarity unlocks, the other polarity locks. Tapping into these wires in the driver's door will work (any other door may not, since with the priority unlock feature it is possible to unlock the driver's door only, the remaining actuators will not se any action). In the old days, the actuator wires were accessible under the dash as well, on the '01 the signals may (and I don't know if this is the case) be multiplexed onto a bus going into the door, and thus hard to access. Typically both actuator wires are grounded at rest, and lock and unlock is done with a positive pulse on one lead or the other. Pulse length is usually on the order of 0.5 - 1.0 seconds. You could tap into the wires directly, or you could use two polarized opto-couplers, one in each direction. There is a Haynes manual for the 98 - 02 Accord (#42014). They usually have decent wiring diagrams. I have found Haynes manuals at several public libraries. >> Hello, >> [quoted text clipped - 33 lines] > directly, or you could use two polarized opto-couplers, one in each > direction. Actually, unless things have changed recently, Honda lock wires are ground activated. Meaning that they lock (or unlock) when ground is applied to the control wires. IIRC, they are light-blue and white and located behind the drivers kick panel. > >> Hello, > >> [quoted text clipped - 38 lines] > control wires. IIRC, they are light-blue and white and located behind the > drivers kick panel. Yes, the control wires are ground activated, but the control wires are not the ones driving the actuators. The actuators are driven with 12 Volts, negative one side positive the other for lock, reversed for unlock. >> Actually, unless things have changed recently, Honda lock wires are >> ground [quoted text clipped - 8 lines] > Volts, negative one side positive the other for lock, reversed for > unlock. And for what he's looking, in my opinion, that is over complicated. The OP just wants a "signal", one for lock and one for unlock. The control wires do just that, already separated by function (lock/unlock) and are low amperage, perfect for connecting directly to a logic circuit for activation detection. That's why almost all car alarm manufacturers go for these wires and not directly to the actuator wires. > >> Actually, unless things have changed recently, Honda lock wires are > >> ground [quoted text clipped - 15 lines] > detection. That's why almost all car alarm manufacturers go for these wires > and not directly to the actuator wires. Absolutely, the signal wires are the easiest to use, if they are available. With the remote receiver built into the door lock control module, the signal wires may not be available externally. If you gave specific information to the contrary, the OP would probably be happy to hear it. The actuator wires not difficult to use. In most cars, with the system at rest, both wires are grounded (not left open). The functions are separated, a positive pulse on one wire means lock, a positive pulse on the other means unlock. If the OP wants info from the remote control only, sensing the actuator wires will not work. Sensing the actuator wires, you will get the same lock and unlock signals no matter what caused the lock or unlock (key, manual switch, remote control etc.). The current flow in the wires is of no consequence. If there are 25 Amps or 5 milliamps, the logic circuit would still just sense a 12V signal. Much thanks everyone for the info. I could probably use use an optoisolator + resistor tied to each one of the lock leads to alert the embedded computer as to power headed for the door solenoids. Is the lock module on the passenger kick panel? I found that module when running some other cables. |
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