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Trailer Brake Controller Installation - 2008 Toyota Tundra

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How to Install a Trailer Brake Controller on a 2008 Toyota Tundra


Today on our 2008 Toyota Tundra, we're going to take a look at and also show you how to install the Tekonsha Primus IQ. This proportional trailer brake controller works great for one of the three axles. Its part number is TK90160. We're also going to be using the Tekonsha Plug-in Wiring Adapter, part number 3040-P. The Primus IQ is a proportional braking system. What that means is it uses a sensor located inside to detect the braking force that's coming from our truck. In an emergency stop situation where we really get on the brakes hard, it feels that and it's going to send immediate heavy braking power to the rear up to whatever we've set with our gain.

On the other hand, if we're just in more of a stop and go traffic situation or just slowly coming to a stop, it's going to send less braking power back there, reducing the wear and tear on our braking components for our trailer. Manuel override lever is going to allow you to manually apply the brakes on your trailer without applying the brakes in your truck up to whatever you set with the gain. Right now we've got our gain all the way up. It's going to go right up to 11. If we turn that down, you'll see it's only going to go up to whatever we need, so even in an emergency style situation where we're trying to get ahold of this, we're not going to overpower those trailer brakes causing them to lock up. Another great feature's going to be the boost settings that are available.

What this allows us to do is set the quickness and the aggressiveness in which our brakes are going to come on based on how heavy our trailer is versus our truck. If we're carrying an empty trailer, we're going to just have B, nothing beside it. That's boost off. We can go into boost level one, boost level two, or boost level three to increase that aggressiveness. Even if we're carrying a heavy trailer that might be right up to the safe handling capabilities of our Tundra, we're still going to be able to have the appropriate amount of braking force available to help us stay in control. Our manual override lever is going to allow us to gradually apply the brakes to the rear of our vehicle, just depending on how far we pull the lever over.

Now, to prevent battery rundown, once our truck's shut off after a little bit of time the Primus IQ's going to shut off too. The Primus IQ's also going to have a built-in short protection for both the braking trailer and any breakaway kit that we might have on our trailer. During prolonged stops, the Primus IQ is designed to reduce the amount of breaking power going to the back so we won't have to worry about premature wear and tear on our braking components on our trailer. Now, the first thing we're going to do here is to get our pig tail installed. It's a pretty easy process. Something I like to do, we've got an additional ground wire here, this is going to help give us an excellent grounding location.

I want to do about maybe six inches from the end of it, seven, eight inches from the end of it. Just going to kind of tape it, the other coil there, the other loom that has the four wires in it. It's just going to help keep it neat when it's underneath our dashboard. Now, we're going to look right behind the parking brake pedal here. We've got a panel here on the side. If we go right above that, there's going to be a large white plug. You'll see right here attached to the wire loom, just behind that panel, that's going to be our plug. Really easy to get to. Take our connector, slide it right on in until we hear that click. Now that part's done. We need to find a spot for our ground to go. Conveniently enough right here we've got a stud. You see the ring terminal's just a little bit too small to slide on there, so we're going to be using one that's a little bit larger just by replacing that. Just going to snip that off and then you'll see standard ten to twelve gauge ring terminal. Just flex it over there. Really good spot to inaudible 00:04:16 to. Pull to make sure it's nice and secure and then we'll grab a long extension and need about eight or nine inches of extension on a twelve millimeter. Then just right here on the bracket that mounts the parking brake, I'm just going to loosen that nut up, take it off there. The ring terminal can go on. We can replace that nut and then we'll just tighten it down. All right, now from that point I like to run it straight forward here and then right above it here we'll find the wire loom that runs through there. That'll be a really good point for us to anchor it out. It's going to keep it away from any of the moving parts here and keep it up out of the way of our feet. Now it's time for us to get our bracket mounted in location. I like areas kind of in here. I want it to be down and out of the way, but still where I can get to it, reach down there if we need to. The area I would say to avoid would be this area over here on the left side of the dash. A lot of times when trying to get in and out of the vehicle, you're likely to bump your knee on it. What we'll do is just use our self-tapping screws here. Get it nice and secure into our dash. Now, this is a good area. We don't have any wiring in here to deal with. Certainly check your application though and make sure there's none back there. We're going to get that leveled out, get that secured on both sides. Now it's time to bring in the Primus. You can see we're going to be using that small indention there and there to bring two screws, the same type just like we just used there, into the side of the controller. It's okay just to get these started at first. Once we've got them started, we can set our angle and then tighten them down. We're pretty tight for space on this inside area, so I'm going to use a little right angle driver, but you could also use a socket, maybe a quarter inch ratchet. All right, it's nice and secure. Now to keep a nice, clean look, I like to take some electrical tape, just wrap up the first few inches of this where it's going to be heading back and tucking underneath the dashboard. Plug right up here into the back and just slide it in. Now, I like to just use a zip tie and go up around a piece of wire loom or a good attachment point underneath our dashboard there so we won't ever have to worry about that wire coming down. Now with our trailer tester plugged in, or in your case maybe your trailer plugged in, we'll see a C there. That means we've got a good connection between our trailer and our brake controller. If that we're to come disconnected, this is going to change and flash NC, letting us know that we have an issue. It's a great built-in safeguard to make sure our trailer's properly connected so when we need it, we'll have the braking force there. Then once reconnected, right back to our C. Now you'll see as we manually override the brake controller, you'll see our needles gradually move up to full power. It indicates we've got power going through our seven pole plug to our trailer. Now in doing this at home, you can simply plug in your trailer and when you operate that manual override, you want to hear the brakes engage. Now with everything working as it should, that's going to complete our installation of the Tekonsha Primus IQ trailer brake controller, part number TK90160. Also using the Tekonsha plug-in wiring adapter, part number 3040-P, both on our 2008 Toyota Tundra.


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Info for this part was:

Test Fit:
Joe V
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Zack K
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Andrew K
Installed by:
Jeff D
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Joshua S
Test Fit:
Nicholas E
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Jacob T
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Andrew L
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Kathleen M
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Mike H
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Dustin K
Installed by:
Cole B
Test Fit:
Shane T
Test Fit:
Alan C
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Sue W
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Randy B
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Chris R
Test Fit:
Jared G
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Zach D
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Andrew S
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Brent H
Test Fit:
Shane H
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Jonathan Y
Test Fit:
Robert C
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David F
Test Fit:
Ryan G

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