Question about 2007 Lexus LS 460 L Sedan

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Automatic park I heard that this car can park itself without much control from the driver. HOW DOES A CAR DO THAT Can you explain to me how that works?

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In order to do a parallel park, you would have to position the LS next to a parked car. Then, put the LS in reverse and turn on the Park Guidance System. Set it to parallel park (the LS also can do a 90 degree park) and let go of the wheel. The LS uses a series of sensors that measure the distance between you and the parked car, and how far away you are from the parking stall. The sensors then send that information to a computer that will calculate that information and will control the steering wheel. The only driver input required is the use of the brake pedal to control the speed and stop the car. In my personal opinion, this is a safer way to park because human error is greater than computer error.

Posted on May 15, 2008

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I'm going to go out on a limb and guess that when you park the car, you pull up the hand (park) brake, shift from drive straight to park and then take your foot off the foot brake and the car moves slightly as it transfers the weight of the car from the foot brakes to, in your case, the transmission rather than the park brake.
Most people do.

When you do this, you're usually putting the weight of the car onto a small lever engaging notches on the drive shaft in the transmission, not the hand brake. The hand brake's designed to hold the car, the lever isn't, it's there just-in-case.
Take a look at http://auto.howstuffworks.com/automatic-transmission5.htm to see how flimsy this part is.
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  • To fix what caused the problem, you need your hand brake / park brake adjusted at the handle. You'll probably find that it adjusts at the other end (inside the rear wheel hubs) whenever you reverse.

For what it's worth, to avoid doing this damage to automatic transmissions whenever I'm stuck in one, I shift to Neutral then take my foot off the foot brake, then the car moves as it's weight shifts from the foot brake to the park brake which I often haven't pulled hard enough. Only when, in neutral, the car is stationary without the foot brake do I put it in park.
In Australia, it became illegal a couple of years ago to not be in the driver's seat when the engine's running. My understanding is that this was because, when the engine's running, sometimes older Automatic transmissions damaged in this way can shift out of Park. This is believed to be what has happened when you see unoccupied cars reversing in circles on "wildest police video" programs on TV. I also heard of some Borg-Warner automatic transmissions fitted to 80s model Ford Falcons (common in Australia), 70s model German saloons, which were particularly prone to Park failing to hold the car on a slope. I drove one for many years in a '75 BMW 528 in which some of it's other drivers developed the same habit.
Similarly, in my own car, I don't take my foot off the clutch until I've taken it off the brake without the car moving. Though the local Road & Traffic Authority regulation states "First gear if you're facing uphill, Reverse if you're facing downhill" I do the opposite because whatever damage might be done to panels will be cheaper than what would be done to the engine if the hand brake failed and it's not going to make much difference in slowing down a rolling car, especially with this one.
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The noise you heard was probably the park locking mechanism trying to engage on the notches in the transmission gear train. If the car holds itself in P range there is no need to worry. These things can happen and normally manufacturers are aware of this and safety devices are already in place to limit damage or injury.e.g the parking mechanism is a small pin that will eventually break first withi=out causing the gear train to lock.
Let us know how you get on.
Cheers.

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