I can't lock my car as there's a short circuit that drains the battery. Every time I switch off my car I have to take out the battery terminal to avoid power drainage and as a result I can't lock my car with a key fob. The test I've done shows that there's a problem with ignition even though it starts normally.
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Have you checked that the boot light is not permanently turned on when the boot lid is shut? Depending on the setting, with the engine turned off, it could be either 30 seconds (energy saving mode) or 10 minutes after the boot has been closed.
If the light is functioning correctly, disconnect the -ve battery cable from the battery and connect a DMM (digital multimeter) between the -ve battery cable and the -ve battery terminal. Set up the meter to measure DC Amps.
The average quiescent current should measure approx 50-80mA.
If you measure more than this amount of current then you need to remove each fuse, one at a time, from the engine compartment fuse box and also the passenger compartment fuse boxes until the current level drops to the normal quiescent value.
Replace each fuse, before removing the next one so as to not confuse which fuse goes where as they are not all rated the same.
When you find the fuse that is supplying the circuit that is causing excessive current to be drawn from the battery, check the fuse allocation chart (usually in the lid of the fuse box or the owner manual) to see what circuit it is used for.
Once you know that you're halfway there to finding out what's wrong.
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