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Old 02-24-2015, 07:56 AM   #1
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Mileage adding on while towing??

does anyone know if the speedometer ads miles while towing on a 2004 Lexus? If so what fuse do I take out to stop it? Also what fuse do I remove to keep battery from running down while in tow?
Thanks in advance for any assistance.

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Old 02-24-2015, 09:23 AM   #2
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See if there is anything in the owners manual about this. I'll bet you need to remove a fuse. If it was me, I would put a switch in the fuse line.
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Old 02-24-2015, 09:43 AM   #3
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What model do you have. Most models can only be towed on a trailer, some a Dolly.
Some need a drive shaft disconnect. Some a manual shift for 4 down.

Read your manual for yours. Recreation towing section.
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Old 02-24-2015, 11:12 AM   #4
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Both Lexus & Toyota do not recommend flat towing any of their models if they have an automatic transmission, so it is doubtful that there would be any info regarding flat towing in the owner's manual. The best way to find out is to write down the mileage and then tow it a short distance and check the odometer. If it does accumulate mileage I would start by removing the fuse for the gauge cluster.
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Old 02-24-2015, 11:16 AM   #5
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Without knowing a Lexus what, your best bet is to follow the instructions in your owner's manual.

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Old 02-24-2015, 06:48 PM   #6
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have never heard of a lexus can be towed 4 down. if drive wheel is lifted, there will be no mileage clocking.
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Old 02-25-2015, 07:44 AM   #7
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mileage

Sorry guys, the toad is a RX330 AWD. I am having a transmission pump installed today. I just need to know if it will accumulate mileage when being towed 4 down and what fuse to pull to keep battery from running down. Our old toad, 2001 Honda Accord never ran the battery down even with two days of towing, but I have heard newer toads put a lot more drain on the battery with the key on??? Thanks in advance for any assistance.

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Old 02-25-2015, 10:18 AM   #8
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Originally Posted by FLYING BUTCH View Post
Sorry guys, the toad is a RX330 AWD. I am having a transmission pump installed today. I just need to know if it will accumulate mileage when being towed 4 down and what fuse to pull to keep battery from running down. Our old toad, 2001 Honda Accord never ran the battery down even with two days of towing, but I have heard newer toads put a lot more drain on the battery with the key on??? Thanks in advance for any assistance.

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You don't tow it with the key in the ON position. You tow it with the key in the ACC position. That way the steering interlock is released but the ECM is not powered on and no mileage is recorded.
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Old 02-25-2015, 10:54 AM   #9
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You don't tow it with the key in the ON position. You tow it with the key in the ACC position. That way the steering interlock is released but the ECM is not powered on and no mileage is recorded.
If I remember correctly, I don't think there is an "ACC" position. There is an OFF, ON, and START. So, you would put it in the ON position. But still, even with it in the ON position, the ECM is not powered.

All late model vehicles with ECMs have "digital" gauges even if the gauges them selves have an analog type display, and without the engine running, the odometer will not register mileage while being towed.

Your best bet would be to run a 12vdc line from your mh's battery(s) to your Lexus battery through the 7-pin connector. This will keep it charged in any case.

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Old 02-25-2015, 08:24 PM   #10
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If I remember correctly, I don't think there is an "ACC" position. There is an OFF, ON, and START. So, you would put it in the ON position. But still, even with it in the ON position, the ECM is not powered.

All late model vehicles with ECMs have "digital" gauges even if the gauges them selves have an analog type display, and without the engine running, the odometer will not register mileage while being towed.

Your best bet would be to run a 12vdc line from your mh's battery(s) to your Lexus battery through the 7-pin connector. This will keep it charged in any case.

Ron

With all due respect, ALL Toyota products of that vintage used the same ignition switch. The positions being OFF-ACC-ON-START.

I spent 27 years with Toyota Motor Manufacturing U.S.A, retiring as a senior powertrain systems engineer. With the ignition switch in the ON position the ECM is powered otherwise the vehicle would not run when started. The ECM is NOT powered in the ACC position.
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Old 02-25-2015, 08:32 PM   #11
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We tow a Lexus 2007 RX 350. Took it to camper's world in Orlando, FL. Needs a pump to run fluid in the transmission. Break system, also needed. Works great ..Cost about total $5000
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Old 02-26-2015, 04:40 AM   #12
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mileage

Yes adds mileage. I added a Roadmaster Invsibrake which gives you proportional braking, stop lights, turnsignals and charges your battery. You need it.
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Old 02-26-2015, 06:23 AM   #13
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mileage

Thanks for all the replys guys. I should be ready to go tomorrow.

Safe travels all
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Old 02-26-2015, 11:27 AM   #14
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With all due respect, ALL Toyota products of that vintage used the same ignition switch. The positions being OFF-ACC-ON-START.

I spent 27 years with Toyota Motor Manufacturing U.S.A, retiring as a senior powertrain systems engineer. With the ignition switch in the ON position the ECM is powered otherwise the vehicle would not run when started. The ECM is NOT powered in the ACC position.

You are absolutely correct. I stand corrected. Memory ain't what it use to be.

Ron
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