I have a 2002 SC 430 and it has started to drain the battery , if i disconnect the battery it stays charged , the only thing i have noticed is that the electric ariel stays up now and does not retract , we have disconnected the ariel in the boot but it still drains , any one else have similar probs ?

I also have a 2002 SC430, and had the same issue when I first bought it. Battery drained, but held charge when disconnected. Eventually I replaced the battery, and have had no further problems. Warning though, some web sites sell supposed SC430 batteries that are too tall, so you can't close the bonnet! Measure carefully first. Never seen the issue with the aerial. Good luck...Paul.

Sounds like a battery to me.

Had a similar problem with an RX8, which in later years could not be left standing for any more that a few days without the battery becoming very lazy - not good for a rotary engine!

If in doubt, replace with a high capacity battery that can battle our cold weather, and provide the energy for those gadgets and mod cons we love in our cars!

[color=#474747][font=sans-serif][size=3]I bought this for £65 delivered for my 2002 SC430 - LEXUS SC Petrol 300, 400, 430 - Solite 096 from [/size][/font][/color][url="http://www.thebatteryguys.co.uk/"]http://www.thebatteryguys.co.uk/[/url][color=#474747][font=sans-serif][size=3]working perfectly. Don't buy the bigger one, it doesn't fit under the bonnet! [/size][/font][/color]

Could be your ML power-amp in the boot on the fritz.

I had this last august - basically no sound and refused to power down - even when no key in ignition.

Common'ish problem - new poweramp is £1300 to £1700 or buy a recon/2ndhand from ebay (US or UK) for £300 and fit yourself.

Aerial being up makes me think the above - hope its just an 'iffy battery