For the past 7-10 days, my 1999 LS400 has had a bit of a problem starting. When I turn the key, the lights (instrument panel and headlights) come on, but nothing happens. If I turn the key off and back on, it will usually start within 1-3 tries.
At first, I thought it might be an electrical or electronic problem, but I am starting to think that it might be the battery. I noticed that the problem is worse the first time I start it each day. After driving it even a little distance (few miles), it usually starts on the first try. Yesterday and today, I 2-3 times without success. I then turned the headlights off (they are usually left in the auto setting), and it started right up.
And the problem seems to be getting worse the past day or so.
All this seems to indicate a weak battery. Is that reasonable?
About 6 months ago, a door was left ajar, which laft an interior light on for 12-15 hours, maybe more. When I tried to start it, it was completely dead. AAA jumped it. I asked them to test the battery. They said it was not 100%, but difficult to test until fully recharged.
When I took it in for regular service about 2 months ago, I asked them to test the battery. They said it was OK.
Before I take it in for service, I would like to know what you all think the problem might be and, more importantly, what it cannot be.
Thanks