All Tesla vehicles are equipped with eSIM or built-in SIM cards that provide 4G/5G connectivity for the car. This Tesla SIM works only on official markets and is useless in “gray” areas. There is no connectivity at all in non-official regions. Installing a local SIM card can solve the connectivity issue. Previously, I explained how to replace the LTE modem and install a local SIM card on the original Tesla Model 3. With the newer generation of cars (Model 3 Highland, Model Y Juniper, and Cybertruck), everything has changed quite a lot. Tesla moved the cellular modem outside the main computer into a separate unit – Tesla Telematics Control Unit (TCU). This module incorporates LTE/5G modem, WiFi, and Audio Bluetooth. The TCU is connected to the main computer via 1000Base-T1 Ethernet. Please note that TCUs for the European and North American markets (and most likely Asian) are slightly different. North American TCU might not support all the LTE bands in Europe and vice versa. More on this TCU is to come, but today we will focus on SIM installation and configuration. TCU location and SIM card installation The TCU is located under the headliner. On Cybertrack, it’s the front headliner trim. On Model 3, it’s the center headliner beam. And on Model Y, it’s the rear headliner. The teardown instructions for the three cars—Cybertruck, Model 3, and Model Y—differ. Please follow the official service manuals. Since I’m driving Model Y Juniper, I will focus on it. In the case of Juniper, everything is relatively easy. 1. Gently pull the headliner to release the magnetic holders. You can leave it partially attached. Just try not to over-bend it. You should see the TCU fixed with two 13 mm bolts. 2. Use a ratchet wrench to unbolt the TCU. It should go easily. 3. Carefully pull out the TCU and release the headliner. You can leave it connected to the power and Ethernet. There is no need to move it far away from the headliner. Just be careful with wires. 4. Install your SIM card. Put ...
First seen: 2025-05-12 02:24
Last seen: 2025-05-12 02:24