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Electric Brake Controller

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Old 11-01-15, 05:25 PM   #16
DanRoth911
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Default Brake controller for 2010 RX450h

I am buying a small travel trailer with electric brakes and I need to install a brake controller in my 2010 RX450h. If anybody has details on how to do it I would greatly appreciate it.
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Old 06-08-17, 11:24 AM   #17
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Originally Posted by natecrna View Post
I got my 2012 RX 350 on Sept 30th. On Oct 1 I was installing a Draw-Tite class III hitch and brake controller.
The dealer wanted $500.00 plus parts to install just the hitch!
I bought the hitch and wiring harnesses for $250.00.
It took me 8hrs to do myself and I know what I'm doing!
The hitch install took all of 45 min. The time consuming part was the wiring for the brake box and trimming the appearance moulding.
I still haven't decided how I want to mount an RV 7 blade wiring harness to the back of the RX 350.
I'm a little vain and don't want it to stick out like a sore thumb.
If anyone is interested in the way I wired a brake controller let me know. It will be and extensive write up and I don't have time to write it out right now.

Happy RVing
I know this is an old post, but I'm hoping someone on here has installed a 7-pin trailer wire harness by now. I have a 2016 RX 450h with the trailer package. All I can find is a 4-pin install. I have a 6X12 enclosed utility trailer with brakes that's way under the 3500 lb towing limit. I need to know how to get the brake wiring done without butchering the wiring. The dealer was ZERO help!

Last edited by gadgetman1; 06-08-17 at 11:25 AM. Reason: spelling
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Old 06-09-17, 02:18 PM   #18
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Originally Posted by Sixtyplus View Post
Looking at a small travel trailer and it has electric brakes. Anyone have experience installing the controller for the electric brakes on a 2011 RX350. I have the towing package.
I'd suggest you let the trailer shop install one for you. Because of ABS it is not just simple matter of installing one. I started pulling camping trailers when kids were young,
dual axle 18 footer with 1 ton van, graduated with 32 ft. fiver with F250 HD towing special Super cab. There were pendlum type, manual type, tiee into brake hydraulic line
type. I think there are more modern electronic controller nowadays. Better have right one properly installed. Good luck.
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Old 06-09-17, 02:23 PM   #19
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Originally Posted by gadgetman1 View Post
I know this is an old post, but I'm hoping someone on here has installed a 7-pin trailer wire harness by now. I have a 2016 RX 450h with the trailer package. All I can find is a 4-pin install. I have a 6X12 enclosed utility trailer with brakes that's way under the 3500 lb towing limit. I need to know how to get the brake wiring done without butchering the wiring. The dealer was ZERO help!
If you have a towing package, no wiring harness came with it? If did there should be a connector Another thing is lights are all LED, something to keep in mind.
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Old 06-10-17, 12:48 AM   #20
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Originally Posted by Htony View Post
I'd suggest you let the trailer shop install one for you. Because of ABS it is not just simple matter of installing one. I started pulling camping trailers when kids were young,
dual axle 18 footer with 1 ton van, graduated with 32 ft. fiver with F250 HD towing special Super cab. There were pendlum type, manual type, tiee into brake hydraulic line
type. I think there are more modern electronic controller nowadays. Better have right one properly installed. Good luck.
I haven't found a "trailer shop" that has ever wired up a Lexus. The trailer package on the RX is only wired for a 4-pin, I need a 7-pin because my trailer has brakes.
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Old 06-10-17, 08:21 AM   #21
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Check this out

https://en.wikipedia.org/wiki/Traile..._North_America

I dont like the colors they used as text does not show through.

Also remember the American trailer wires combine the turn and brake together .. so tp interface with Lexus, you need a module instead of straight tapping into turn signal [logically Turn OR Brake]. This what a 5 wire module gives you.

For 7 wire, you can take the 5 wire module and add 2 more wires by directly tapping into Brake and Power (Aux -> ACC/RUN). You have to make sure your Aux can handle the current needed by the trailer, and if not, you need to run a dedicated wire + fuse from the battery and add a relay which is activated by the switched power (Accessory/run).

Once the above is understood, you can search to see if the 7 wire module has a built in relay .. would require an additional run to +12v battery and then do the wiring of 5 + 3 more wires [12v, switched 12v, brake].

Salim

Last edited by salimshah; 06-10-17 at 08:28 AM.
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Old 06-10-17, 08:35 AM   #22
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Originally Posted by gadgetman1 View Post
I haven't found a "trailer shop" that has ever wired up a Lexus. The trailer package on the RX is only wired for a 4-pin, I need a 7-pin because my trailer has brakes.
There ought to a adapter for accommodate 4 pin to 7 pin config. When you draw out the wiring between two on a piece of paper it is easier to see what has to be done.
Tried Google or Youtube search?
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