Water leak causing power failure

[James]

Hello

my 2004 2.4 hybrid Alphard has spent the last 9 months in and out of the garage suffering loss of power. It doesn’t start as seems not to recognise the hybrid battery. The garage have checked out the battery and cleaned up contacts etc and give it back to me ‘working’ only for me to do 5 miles and the same problem recurs! 
it first failed on a wet day, the second was after returning and I found the drivers footwell carpet sodden beneath a dry footmat, the third time I had tested to see if the moon roof and sunroof drains were blocked (they were clear, water running out at the wheel arch areas), the next was after washing the car and the last time was after spraying a hose over the car to see if the problem would recur which it did after about 5 minutes after the hosing.

the next day the car started and ran again.

i have currently masking taped the moon roof and sun roof and it has started after a light shower.

Is it possible to access the roof drains along their length to see if there is a leak and what it may be shorting? Any suggestions as to where the problem may be?

could it be water getting under the bonnet into the engine compartment from the windscreen base drain and running onto the hybrid unit front right?

sorry it’s a very long post but really stuck and can’t use the car if it is unreliable. Have lost confidence in the garage having spent a lot of time and money to have a car back with the original problem!

thanks for your help guys!

[Picasso]

hello james sorry your having bad look at the moment have you tried have a smoke test not sure if thats what its called in the car see if there is any places where it might seep out of the sealed vehicle .

[James]

Hello Picasso

no I haven’t heard of it. I will look it up thanks.