2000 Lexus RX 300 6 cyl All Wheel Drive Manual 78000 miles
The battery in my Mom's RX300 goes dead if not driven for about two weeks (she has another car). I has traced a parasitic current draw down to two circuits. With the ammeter connected to the negative battery cable and the battery post (cable disconnect), I get 0.596 amps. With DOME fuse removed I get 0.300 amps. If I remove the ECU-B fuse I get 0.387 amps. No lights in the DOME circuit are on, I checked them all. No check engine light is all. Everything works fine and if driven everyday the battery stays fine. I assume the ECU-B requires current to operate the alarm system when the ignition is off. If the problem is in the DOME circuit I have not idea how to diagnose the problem. Any advice would be greatly appreciated.
Saturday, May 30th, 2009 AT 12:10 PM