I have a 2005 Toyota Avalon that has a parasitic drain problem.
What is your question?
After a few days of no use. The battery is drained. Battery is good. I monitored the current while I pulled the under hood fuses one by one. The fuse that dropped the current is the ECU-B fuse (10A). The current starts out at about 300 ma. then drops to 150 ma. after about 1.5 minutes. Then after another few minutes, the current drops to about 10 ma. and fluctuates just a bit with the alarm light. I took a short ride without the ECU-B fuse. Car operated normally except for a dash light showing a passenger with the SRS warning light (passenger with big ball in his lap). What component(s) could be the cause? I am an electrical engineer and mechanically inclined.
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What makes this problem better or worse?
If I drive often, the battery won't die, but car is not driven often enough.
How long has your 2005 Toyota Avalon had this problem?
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10 ma isn’t going to drain the battery - especially not n a few days .. What’s the alternator output voltage at the battery?
Battery been properly LOAD TESTED and each cell TESTED using a hydrometer after full charge?
50 ma is acceptable load !
