NOTE: This guide is for ZE0 and AZE0 24 kWh 2011-2015 and very early 2016 models. For 24/30 kWh 2016-17 MY and ZE1 2018-20, please refer to this guide.
This detailed guide will walk you through the process of reactivating your vehicle's Telematics Control Unit (TCU). Follow each step carefully to ensure a successful setup. This process is commonly used for vehicles like the Nissan Leaf to restore connectivity features.
Difficulty:Easy
Step 1: Obtain a SIM Card
You’ll need a SIM card to enable cellular connectivity for the TCU. Here’s how to proceed:
SIM Type: Ensure it’s a standard Mini SIM (2FF) or compatible with an adapter.
Data Plan: Select a plan with at least 1-5 MB of monthly data without a navigation unit, or 5-20 MB of monthly data with a navigation unit (TCUs typically use minimal data for telemetry, while the navigation unit consumes a bit more for its functions).
With OpenCARWINGS Integration Out-of-the-Box: A SIM card from provider viaaq mobile offers out-of-the-box integration with OpenCARWINGS and an affordable data plan.
Note: Test the SIM in a phone first to ensure it’s active and receives SMS/data.
Step 2: Access the TCU
The TCU is typically located behind the glovebox in many vehicles (e.g., Nissan Leaf). Follow these steps:
Preparation: Turn off the vehicle and remove the key from the ignition to avoid electrical issues.
Glovebox Removal:
Open the glovebox and empty its contents.
Locate and remove the screws (usually 2-4) along the edges or inside the glovebox.
Gently pull the glovebox forward; it may be held by clips—use the trim tool to pry it loose if needed.
Disconnect any wiring (e.g., glovebox light) by pressing the connector tabs and pulling.
Locate the TCU: Behind the glovebox, you’ll see a rectangular metal or plastic unit (about the size of a small book) with wiring harnesses and an antenna connection—this is the TCU.
Visual Guide: Watch this YouTube video for a step-by-step demonstration:
Note: Work carefully to avoid damaging clips or wiring. Take photos of the setup before proceeding, for reference.
Step 3: Replace the SIM Card
With the TCU exposed, replace the old SIM card:
Disconnect Power: Unplug the TCU’s main harness (usually a multi-pin connector) to power it down safely.
Open the TCU: Unscrew or unclip the TCU SIM slot cover.
Remove Old SIM: Locate the SIM slot (a small tray or slide-down slot), remove the old SIM, and set it aside.
Insert New SIM: Insert the new SIM card and slide the slot into the locked position.
Reassemble: Close the SIM slot cover, secure the screws/clips, and reconnect the harness.
Note: Handle the SIM and TCU gently to avoid bending pins or damaging components.
Step 4: Program the settings
The Access Point Name (APN) must be configured for the TCU to connect to the cellular network. Use an Android app:
Transfer the .apk file to your Android device (via USB, email, etc.).
Enable “Install from Unknown Sources” in Settings > Security.
Open the file and install the app.
Connect to TCU: Power on the vehicle. Use the app to connect to the TCU via Bluetooth OBD.
Set APN:
Open the app and locate the APN settings.
Enter the APN for your SIM provider (e.g., Hologram’s is “hologram”; check your provider’s website for specifics).
Save and apply the settings.
Set Server Hostname (optional):
If your LEAF is an EU-market model, you can skip this section if you don't want to use an alternative server.
If you have a US-spec car and want to use the public server, you can use the hostname for the default server: nissan-eu-dcm-biz.viaaq.eu
Enter the server URL in the TCU Configurator app.
Save and apply the settings.
Note: Ensure your Android device has Bluetooth enabled and the car ignition is turned to ACC during configuration.
Note: If you have trouble reading the configuration of the TCU, turn off the Data Integrity Check in the TCU Configurator app.
Step 5: Complete Setup on Website
Finalize the TCU activation via a web portal:
Identify the Service: Determine the telematics service your vehicle uses (e.g., NissanConnect for Leaf). Check your vehicle manual or the service website.
Log In/Register: Visit the service’s website, log in with your vehicle account, or create one using your VIN (Vehicle Identification Number).
Activate TCU:
Navigate to the telematics or connectivity section.
Enter the new SIM’s details (e.g., phone number, ICCID from the SIM card).
Follow the prompts to pair the TCU with your account.
Verify: Do a data refresh to confirm the TCU is online.