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How to test Remote Key Transmitter?

Discussion in 'General Electronics Discussion' started by Z2TT, Jul 6, 2009.

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  1. Z2TT


    Jul 6, 2009

    The remote central locking my car has not been working. There are 2 main components. The reciever unit which is located in the trunk and the transponder unit which is on the key. The reciever unit recieves the signal and then sends a voltage through the wires to the door lock solenoids to lock/unlock.

    The Key transmits the signal to the reciever unit. Both the key and the receiver unit are equipped with a ROM chip that has an identical code.

    I know that there is no severed wires from the reciever unit to the door locks as I can manually lock/unlock the door by shorting the pins out on the connector.

    I bought a replacement reciever unit off ebay supposed to be working and still did not solve the problem. At this point I am suspecting it's the transmitter on the key so I began to test that.

    When I pressed the button it draws voltage from the battery in it, so this demonstrates that something works inside the circuit, but I am not sure that the signal is being transmitted. How would I test if the signal is being transmitted?

    I don't know the frequency, but I think it should be around 300 or 400mhz as this is the frequency these devices commonly operate on.

    Any suggestions would be great. Thanks.
  2. selvaganeshi


    Jul 8, 2009
    to test your IR remote use the following circuit
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