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shortimer

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  • First Name
    Vern

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  • Lexus Model
    ES300
  • Lexus Year
    2001
  • Location
    Nevada (NV)

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  1. My wife's 2001 ES300 has had a slow battery drain that results in a low battery charge and inability for the car to start after several days of not being driven. I first charged the battery to 12.7 volts with a battery charger, I checked the alternator and found charging at 14. 4 volts and took the battery to Pep Boys to conduct a load test and battery condition after 1.5 hour charge. Battery checked out in good condition. I then proceeded to finding what was causing the battery drain. Using a multimeter set on "amps" I removed the ground connector from the battery and hooked one multimeter lead to the battery and the other lead to the disconnected battery ground cable connector. After 3-5 min. with the ground strap disconnected, I took a reading of the battery drain. The multimeter showed a 150 ma current drain. At that point I started pulling fuses to see which would stop the drain. When I pulled the 10a ECU-B fuse the drain immediately dropped to 20ma. The question I have is what devices/circuits receive power through the ECU-B fuse? Second, what further steps can I take to determine what device/circuit fed from this fuse are drawing current with the key off and the car sitting idle?
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