Wiring brake controller for RX400h

Wiring brake controller for RX400h - towing

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Chris Lamb - 24 Jun 2008 15:14 GMT

Having a hard time finding parts and info to install a receiver and
brake controller on my 2008 RX400h. Lexus website says tow capacity
is 3500#. In US, most states require brakes on trailer if over 3000#.
Therefore it is necessary to install some kind of brake controller.
Lexus dealer here is useless and won't touch it. Place that will
install receiver doesn't want to touch the electricity. Help.

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Ray O - 24 Jun 2008 22:35 GMT

> Having a hard time finding parts and info to install a receiver and
> brake controller on my 2008 RX400h. Lexus website says tow capacity
> is 3500#. In US, most states require brakes on trailer if over 3000#.
> Therefore it is necessary to install some kind of brake controller.
> Lexus dealer here is useless and won't touch it. Place that will
> install receiver doesn't want to touch the electricity. Help.

You can get online access to the factory repair manuals and wiring diagrams
for $10/day at techinfo.toyota.com. The factory information will not tell
you how to install a brake controller, but the instructions for the brake
controller should tell you which wires to tap into, and you can identify the
correct wires with the factory wiring diagram.

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Ray O
(correct punctuation to reply)

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greg - 05 Aug 2008 20:08 GMT

> > Having a hard time finding parts and info to install a receiver and
> > brake controller on my 2008 RX400h. Lexus website says tow capacity
> > is 3500#. In US, most states require brakes on trailer if over 3000#.
> > Therefore it is necessary to install some kind of brake controller.
> > Lexus dealer here is useless and won't touch it. Place that will
> > install receiver doesn't want to touch the electricity. Help.

If you are towing a camp or boat trailer 1500 lbs or more, they will
usually have a surge brake built in and you won't need a brake
controller. If you are towing something big enough to need a separate
electric brake system, it's probably over the 3500 lbs your vehicle
can handle anyway and a controller becomes a moot point.

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