Electrical Drain - Toyota Yaris Forums

CTScott · 01-15-2010, 09:44 AM

If you have access to a multimeter, you can check the powered off current drain yourself. This is from a post I made in another thread a couple of months ago:

On my 09, which has keyless entry and remote start, I measured the off state current draw at approximately 300mA. This means that in 24 hours this powered off Yaris will use 7.2 Amp Hours. This is a significant amount of draw, as it means that this sitting Yaris will have a dead battery in less than two weeks.

On Crashy, who is a bare bones 08, I measured the off state current draw at approximately 160mA, which equates to 3.84 Amp Hours of draw in 24 hours.

In doing some measuring of current draw of various things while the ignition is off I found the following to have the most significant draw while powered off:

ECM: 50mA
Body ECU: 100mA
Radio: 5mA
Clock: 5mA
Keyless Entry/Remote Starter on my 09: 150mA

The ECM, radio, and clock are all reasonable. The keyless entry / remote starter on my 09 is no surprise as it is an active system waiting to hear from an RF remote. The body ECU is the one that really surprises me. This is an ECU that is built into the white plastic chunk that we tend to refer to as the under dash fuse panel.

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01-15-2010, 09:44 AM	#3
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	If you have access to a multimeter, you can check the powered off current drain yourself. This is from a post I made in another thread a couple of months ago: On my 09, which has keyless entry and remote start, I measured the off state current draw at approximately 300mA. This means that in 24 hours this powered off Yaris will use 7.2 Amp Hours. This is a significant amount of draw, as it means that this sitting Yaris will have a dead battery in less than two weeks. On Crashy, who is a bare bones 08, I measured the off state current draw at approximately 160mA, which equates to 3.84 Amp Hours of draw in 24 hours. In doing some measuring of current draw of various things while the ignition is off I found the following to have the most significant draw while powered off: ECM: 50mA Body ECU: 100mA Radio: 5mA Clock: 5mA Keyless Entry/Remote Starter on my 09: 150mA The ECM, radio, and clock are all reasonable. The keyless entry / remote starter on my 09 is no surprise as it is an active system waiting to hear from an RF remote. The body ECU is the one that really surprises me. This is an ECU that is built into the white plastic chunk that we tend to refer to as the under dash fuse panel.