My 91 Camry started leaking water into the driver side about 10 years
ago, and into the passenger side about 3 years ago. The cause looks to
me like a design fault. The channel under the wipers drains out a hole
in each side (behind the side panels over the front wheels). These
drain holes have rubber flaps, presumably to stop dust getting in. What
happens is the flaps obstruct the drain holes sufficiently to trap
organic material (leaves etc) that has made its way into the channel.
After some years the organic material causes the channel to rust
through, letting water into the inside of the car. To make matters
worse, the water enters directly over some important electrical stuff -
junctions, fuses and relays.
I believe, but can't prove, that this is the cause of a frustrating
intermittent problem that I have. Although I've done what I can to stop
water coming through (various measures that I will not elaborate on
unless asked), the car has a fault in the ignition system that sometimes
stops the spark from happening. This usually occurs on trying to start
the car, but a couple of times it has failed while the engine was
running. The failures are unrelated to the weather, and recently have
happened when it's been dry for weeks. All electrical tests I've
carried out show OK. This has been plaguing me for couple of years.
Usually the car restarts within about half an hour, but not always. A
mechanic replaced the distributor, but that didn't change anything. The
error code is 43, which refers to the starter signal STA, but that
doesn't really make sense since the engine cranks and there is always 12
v at the distributor.