Daveo I recently fitted the TOAD AI606 to my MK1, it did take me a lot longer than I was expecting but I got there in the end.
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If you are confident using a multimeter and you have at least two complete days free to do it then go for it.
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Do you have the fitting instruction guide? If not then I can email it to you.
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I recommend proceeding in the folloowing order:
1) fit alarm
2) fit remote central locking
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3) fit immobiliser
what i mean is dont try and do all things at once those wires get confusing!
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Another thing to note is that it will not be Thatcham approved or be under warranty if you do it yourself, but saves you a hell of a lot on fitting costs.
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I took ages fitting mine because i wanted to be 100% sure that everything was conected right so i didnt blow it up and then it not be under warranty.
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Just make sure that you SOLDER AND HEATSHRINK all connections.
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.
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.
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crimp-on wires are a fire waiting to happen.
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I have heard of people taking their DIY job to a thatcham installer, then paying them
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£30 to check it all out and then sign your thatcham slip if tis ok and within thatcham requirements
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(e.g.
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soldering).
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Oh one other thing, once winter started coming and there was some torrential rain my alarm kept triggering.
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.
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.
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I discovered it to be the bonnet sensor getting drenched so covered it up with some plastic sheeting and no problem since.
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.
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.
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Other than that never had a false alarm, awesome!