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I decided to improve it to something more audible and up to date.
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I bought a 12 volt 3-Tone Piezo Buzzer from Maplin
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![Image](http://www.mr2oc.net/jimi/MK1LightReminder/ku60q.jpg)
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The relay is brown and is mounted in the top left side of the front boot, remove it from the bracket and take the plug out.
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![Image](http://www.mr2oc.net/jimi/MK1LightReminder/0904070006.jpg)
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Use a small screwdriver to unclip the back, remove the circuit board by pushing the pins on the socket.
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The case will need a minor modification, I used a Dremel to remove a small rib from the top of the case, you can see that in this picture.
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![Image](http://www.mr2oc.net/jimi/MK1LightReminder/0904070001.jpg)
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All the components can be removed from the circuit board either by de-soldering or a pair of snips.
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Position the new buzzer on the board as shown and drill a couple of small holes to feed the wires through.
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![Image](http://www.mr2oc.net/jimi/MK1LightReminder/0904070002.jpg)
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![Image](http://www.mr2oc.net/jimi/MK1LightReminder/0904070003.jpg)
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Replace the circuit board and buzzer back in the case.
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![Image](http://www.mr2oc.net/jimi/MK1LightReminder/0904070004.jpg)
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If the green and yellow wires are connected together a two-tone siren sound is produced; if the green and orange wires are connected together the unit emits a pulsed tone, and if all wires are left unconnected, the output is a continuous tone.
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I liked the sound best with all 3 wires joined together, but it's up to you.
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replace the back of the relay, refit the relay to the car, refit the plug
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![thumbsup :+:](./images/smilies/jef_icon_thumbup.gif)
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![Very Happy :D](./images/smilies/icon_biggrin.gif)