Click for Coverage
Due to the EU’s Global Data Protection Regulation, our website is currently unavailable to visitors from most European countries. We apologize for this inconvenience and encourage you to visit for the latest on new cars, car reviews and news, concept cars and auto show coverage, awards and much more.MOTORTREND.COM
  • JP Magazine
  • Dirt Sports + Off-Road
  • 4-Wheel & Off-Road
  • Four Wheeler

Unlock Your Wrangler’s Potential With a Tazer JL

Posted in How To: Electrical on March 5, 2019
Share this

The new Jeep Wrangler JL is the most technologically advanced Wrangler ever produced. It may also be the most capable. While technology is always a good thing when safety is a factor, for many Jeep purists, the more saturated with electronic nannies the Wrangler becomes, the farther it strays from its 1941 Willys roots. We see both sides of it.

On one hand, we love the fact that the JL Wrangler is more fuel efficient, responsive, and refined over the previous-generation JK. On the other hand, if we’re shelling out tens of thousands of dollars for a Rubicon, we want to be able to choose when we get to use the lockers. Thankfully, there are companies capable of diving into the complex digital wizardry of the modern Wrangler. One in particular is Z Automotive.

The company specializes in unlocking your JL’s potential. We say unlocking, because the Tazer JL we picked up from Z Automotive isn’t a performance tuner that is designed to pump out more power. Rather, it’s a tool that allows you to break into your Jeep’s complex computer and very simply modify parameters to your liking. Tired of the auto stop-start feature? Turn it off. Want to be able use your rear locker in 2WD? No problem. Got taller tires and need to recalibrate your speedometer? Yeah, it does that too.

We picked up our Tazer JL from Northridge 4x4; we found they had the best price online. Included with the package is the bypass module, OBD-II plug-in, and USB cable for computer updates.

Moving up to a 35-inch-tall tire on our ’18 Jeep Wrangler Unlimited Rubicon meant our speedometer no longer rang true. Since we wanted to correct that feature and liked the assortment of other options offered with the Tazer JL, we picked one up and went to work fine-tuning our Jeep to our liking. So, how does it all work, and was it worth it? Read on to find out.

Before you plug the module into your Jeep, we recommend (as does Z Automotive) checking for the latest firmware updates. These updates are free, and the Tazer JL comes with the necessary connections to allow you to easily get the latest downloads from your computer. We’re running the latest (11.0.7e), which is actually a beta version.
Hooking up the Tazer requires plugging the OE connections under the dash into the bypass harness. This will remain plugged in whether the OBD-II portion is attached or not.
The Tazer has two categories of features: Live and Vehicle Settings. Some of the Live ones include the auto stop-start delete and TRAC Kill, which automatically turns off your traction control as soon as you turn on the Jeep. We liked both of those features, so we tend to keep the Tazer plugged into the OBD-II port. We found that it hangs out a bit, and we’ll likely relocate the OBD-II plug under the dash to secure the module out of way. Note: As of writing this, there is now a new Tazer JL Mini that allows you to only have the bypass module and not the OBD-II portion as well.
Once both portions are plugged in, you’ll need to access the Tazer menu. This is done by scrolling through the Jeep’s center display until you get to the audio display. From here, you’ll press the cancel button on the cruise control while holding the left arrow button. You’ll need to find the “marry” section by continuing to press the cancel and left arrow buttons. Once there, hit the cruise control on/off button while holding the left arrow and the “marry” process will commence.
Once the Tazer is married to the Jeep, you can comb through the menu. For many (us included), the tire adjustment section and the TPMS tab will be the most useful. We measured our 35x12.50R17 Nitto Ridge Grapplers to be just a hair under 35 inches tall (very common). So, we picked the 34.740 setting, which got our speedometer back in check.
We opted to retain the TPMS sensors in our wheels but did drop the PSI threshold down a bit. There is an option to completely remove the sensors if you choose to go that route. While we’re keeping the Rubicon’s 4.10 gears for now, the Tazer will also allow us to update the differential gear ratio. There’s even a range option for the T-case low-range ratio if we ever find ourselves swapping out transfer cases.
If you’re looking to have the least invasive driving experience, turning on SS Kill and TRAC Kill is right for you. Both of these fall under the Live function category, meaning the Tazer has to be plugged in. By “killing” those features, you are effectively turning off the auto stop-start and traction control system every time you turn the key. While you won’t get any sort of light on the dash for the stop-start, the Trac Kill will bring up the traction control icon.
There’s a pretty expansive list of features the Tazer JL allows you to tap into, but for Rubicon owners, this one is a favorite. We can now use the rear locker in 2WD and 4-Hi! This is great for playing in the snow, mud, and sand. That being said, we found that we sometimes would receive a locker warning message and subsequent chiming while driving in 4-Hi with it engaged. This could be due to the fact that this is a beta version of Z Automotive’s latest download.
You can actually add some Rubicon flare to your screen by toggling between the Rubicon, Sahara, and Sport splash screens. It’s a random but fun option.
Here’s a big one for those looking at ditching the electronic steering pump for a more conventional one. You can “delete” the electronic steering pump from the Jeep’s computer. This is ideal if you’re looking at converting to a more off-road–friendly hydraulic-assist kit such as the one PSC Motorsports is now rolling out.
Want to get rid of the front axle disconnect so you can upgrade to a one-piece axleshaft? Or how about a non-OEM axle swap? The Tazer JL allows you to delete the FAD from the equation.
This is what ultimately pushed us to the Tazer: moving up to 35s on a 17x9 Venom Rex wheel. Sure, the JL doesn’t need to have a programmer when you add larger treads. However, if you want your speedometer to read correctly, you’ll need to adjust those parameters. This also made a difference in shifting versus when we installed the 35s without the Tazer.

Tazed and Not Confused

Reprogramming your Jeep for a new tire size is the most common need for a programmer of this kind, but this module is far more than that. We’ve actually just touched the surface of what it can do. Handy features such as the ability for your passenger to be able to input navigation coordinates while the Jeep is in motion are great. We like the module, and our kids enjoy some of the fun features such as the light show(s). For Rubicon owners, it’s well worth it just for the locker and sway bar features. The JL is a complicated Jeep, but it can feel a little more nannie free and personalized thanks to this module. While you might not need all of the features (yet), it’s a relatively inexpensive investment that can grow with you and your Jeep.


Northridge 4x4
Silverdale, WA 98383
Z Automotive

Connect With Us

Newsletter Sign Up

Subscribe to the Magazine

Browse Articles By Vehicle

See Results