Lonsdor K518ISE “Fiat 500x 2019 fail to read pin” Solution

Let’s start this article with a customer’s confusion: used Lonsdor K518ISE key programmer to work on Fiat 500x 2019 Smart key fail to read pin. Swg bypass installed, 2017 2018 success. But this one is 2019+. And I have original key.

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This car(500X) is a twin of 500L, also of Jeep Renegade and Compass.

Lonsdor support say me need L-JCD cable


What’s L-JCD cable by Lonsdor?

Chrysler, Dodge and Jeep 2018 + Universal Programming Cable – made by Lonsdor. This bypass cable has been certified by Lonsdor but it will also work for many other programming machines that use a similar process AutoProPAD and AutoProPAD LITE etc..

This cable has been designed to interface almost all automotive transponder programmers that have the capability of programming 2018+ Chrysler vehicles. It functions by intercepting your programmer’s CAN high and low signals and passing them through the attached probes. Depending on your plan of attack, you can tap the CAN wires directly in the STAR module, in the vehicle instrument cluster or at the wires which transport the information between the STAR module and the immobilizer. The OBD throughput will feed 12V back to your programmer to keep it charged if that feature is supported by your machine.

How to use L-JCD cable by Lonsdor?
Plug the main cable of your programmer of choice into the female OBD port of the adapter.
Locate the star module on the vehicle. Location varies from model to model.
Locate the plastic green strip with white cables plugged into it. Probe your red (CAN HI) into the green cable of the first plugin, and the black (CAN LO) into the yellow wire.
Use your programmer of choice to select by vehicle or system type and program like normal.

Please read the following operation guide on how to use Lonsdor K518ISE + L-JCD Cable to program 2018 -2020 Jeep Wrangler when AKL, it is similar as Fiat 500x 2019.

Car model and year: 2018 Jeep Wrangler new system, the customer lost all PROX Flip Keys

Purpose: we’re gonna program a new key with a Lonsdor K518ISE.


Let’s start, first of all, let’s make sure we have the star connector behind the glass compartment and we connected the bypass cable, here the black one goes on the yellow, the read one goes on the brown white.


Let’s start to operate on the Lonsdor K518ISE.

Path: Tap “Immobilizer” -> Jeep -> Select from vehicle-> North America -> Wrangler -> 2018-2019-> Smart key.


We are gonna add a smart key, the ignition is off, we’re gonna make sure turn the hazard lights on.

We can see, we have 2 keys in the system right now.


Put the smart key to be programmed inside car, take another key out of the car.


Please make sure there are no other devices near the smart key.

Configure rating system, reading PIN code.

After confirmation, press car start button with the smart key’s larger end, do not release the button until the device prompts to release it.


Obviously, we have 3 keys.

Programming complete.

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Let’s make sure it works, I’m gonna turn off the hazard, unlocking and locking.

And let’s make sure the car starting, okay, the car is on.