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…

RemcoW. This is a good approach but the drain for a 4 day depletion is a bit higher. In alaska it depends on the temperature and I hope the dealer is using battery capacity properly rated for the lower temp range. Many retrofit devices are not properly installed and that is what I worry about. Plus…

You can’t pull a fuse on todays cars and check for a current draw. When doing that you can force a computer/module to go to sleep that may be drawing the current and never find the current draw. Instead, leave everything connected and take an infra-red thermal gun and point it at the fuses and rela…

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.

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…

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 …

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.

Lexus RX350 Battery Drain Problems

Maintenance/Repairs

ok4450 June 17, 2012, 7:44am 8

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.

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Lexus RX350 Battery Drain Problems

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