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post #1 of 8 (permalink) Old 10-01-2012, 05:53 PM Thread Starter
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parking assist sonar and rain

I searched, but no luck. I have a two week old 2012 Tundra Crewmax with the parking assist sonar. A few days ago we received rain. My rear sonar's went off continuously when in reverse, even though nothing was behind me. I cleaned and dried the rear sonar sensors, but the issue continued. Once the truck (and streets) dried up, no more issue. The manual indicates this could be a problem if water, mud, or other debris gets on the sensors, but after cleaning them off it should have operated correctly. My concern is if this is possibly water getting in and shorting out something, or if it is just an idiosyncrasy of the system. Dealer was no help. I explained it in detail and even suggested wetting the rear bumper, but they simply turned it on and noted that it was now working correctly.

I can understand the heavy rain and spash-up creating a problem, but when the rain stopped and the sensors were cleaned and dried, the problem should have stopped. It didn't. It continued until the entire bumper had dried. (Next day)

So, does anyone know if this is a common issue I should ignore, or is there something wrong that needs to be fixed? Any help will be appreciated.

Last edited by mnotx; 10-01-2012 at 06:22 PM. Reason: add to post
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post #2 of 8 (permalink) Old 10-01-2012, 06:06 PM
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Ive had my truck for about a year, and this past Saturday, the front sensors were going crazy in the rain. I just turned them off. That was the first time its done it to me in the rain.

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post #3 of 8 (permalink) Old 10-01-2012, 08:11 PM
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it rains alot up here, and yes the sonar does not like it at all. I have had it either always going off, or not working at all.

First time it happened, i took it in to the dealer, pointed out which one I suspected it was and they replaced it. (under warrenty) it started doing the same thing a couple months later, and it was the new one doing it :P. Once it dries up it works fine. I think the water distorts the signal somewhat, with the rear sensors being more sensitive (more range) haven't had any issues with the front ones however.

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post #4 of 8 (permalink) Old 10-01-2012, 09:08 PM Thread Starter
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Originally Posted by Ditchhooker View Post
it rains alot up here, and yes the sonar does not like it at all. I have had it either always going off, or not working at all.

First time it happened, i took it in to the dealer, pointed out which one I suspected it was and they replaced it. (under warrenty) it started doing the same thing a couple months later, and it was the new one doing it :P. Once it dries up it works fine. I think the water distorts the signal somewhat, with the rear sensors being more sensitive (more range) haven't had any issues with the front ones however.
Good to know I am not alone. I sent this question to Toyota to see if they had a response. Guess we'll see what they say....if anything.
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post #5 of 8 (permalink) Old 10-01-2012, 09:09 PM
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I'm having the same issue with my front right sensor. I'm going to take it in and have it replaced under warranty. For now, I shut it off when it's wet so it doesn't drive me crazy.


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post #6 of 8 (permalink) Old 10-02-2012, 03:50 PM
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I have after market sensors (AudioVox) and it does this too...but after I swapped them out with replacement (warranty), it work as it should...no noise when rain except when I drive over a huge puddle and big splash of water hits it directly. Most of these electronic parts are made in China and quality is second to everyone...
My LS460 also have sensors and never have this issue...the whole car is made in Japan.

If the dealer is telling you that it is "normal"...what they're trying to say is "we can't make money off of you, please go away"...
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post #7 of 8 (permalink) Old 10-02-2012, 06:46 PM
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I hadn't even thought about having it replaced. Ill mention it to them when I go in for my next oil change.

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post #8 of 8 (permalink) Old 10-03-2012, 02:41 AM
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This happens to mine a lot as well. It rains in Hawaii so at least once a month I have this problem. It goes away when it dries out so it's not worth replacing to me. Plus I have the camera in the rear so I don't rely on just the sensors.


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