My Mom purchased a new 2011 Lexus RX350 last spring. The dealer installed a remote starter at the time of purchase (we live in Alaska). We’ve had a continuing problem with the battery going dead if the car has not been driven for a period of time (like 4 days). When she does drive it, it is for s…

Tester, Almost right. You really cannot see parasitic drain on any infra-red I have used. The heat just dissipates over the copper and the differential is pretty small. I know there are better ones for more money than a person would want to spend. There are fuses perfectly ok to remove without your…

It would depend on the resolution of your thermal gun. I have both high/low resolution thermal guns. But there’s another way to check for a current draw without pulling fuses. Take a volt meter and measure the voltage drop across the fuses. A fuse with a high voltage drop means the fuse element is …

Tester, I was assuming a test at the fuse. I did not make this clear. An amp drain test by pulling the fuse and then testing across the fuse contacts. Not the battery terminals. I should have been clearer.

What would help is to know how many milliamps are being pulled; both sans remote starter and with remote in place. One would hope the dealer would have checked this and properly done it should have been put down in writing on the repair order.

You’re not getting it. What if there’s a module that isn’t going to sleep. If you disconnect the battery or pull a fuse that forces that defective module to go to sleep. And then if you check for a current draw it won’t be there. Because you forced the module causing the problem to go to sleep. Tes…

Here’s the first procedure when checking for a parastic current draw on a modern vehicle. Let the vehicle sit for at least an hour to make sure all computers/modules have gone to sleep. Tester

Tester, Fine, Just trying to give ideas to an OP who has to burn 260Miles of gas in alaska (higher than 4$ a gallon I bet) to get back to the DEALER, who likely caused the issue to begin with. You are right up to a point but then I have nothing more to say as it will not change anything.

Not for nothing but could one see power dissipation across a fuse with a thermal scanner if the current is just - say - 40 mA? I’m assuming some normal batter so somewhere around 40 AH and let’s assume that drains over four days to being dead as a door nail. That’s 40/4 = 10AH per one day. That’s …

http://www.searchautoparts.com/motorage/scope-scan-service-repair/new-approach-testing-parasitic-draw Tester

Lexus RX350 Battery Drain Problems

Maintenance/Repairs

euryale1 June 17, 2012, 8:09am 10

Module draw is live when it is told to be live. Otherwise our cars would never start. If it is not going to sleep, a rare issue, then you can also pick this up. A thermo scan will not see an active drain easily on a 600ma drain across a 20 amp plastic encased fuse either. But given the mods to this car I would start there and I am sorry if you disagree.

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Lexus RX350 Battery Drain Problems

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