Telematics Control Unit (TCU)
Introduction
The Telematics Control Unit (TCU) provides connectivity to the Nissan Leaf. It is a 2G, 3G, 4G or 5G modem, depending on the year and region, with additional functionality. The TCU provides internet connectivity to the AV Control Unit via USB, while also communicating with Nissan's servers in its own right to provide CarWings / Nissan Connect functionality such as remote climate control.
Location and access
The TCU is located on the right-hand side of the vehicle in all models.
Left-hand drive
The TCU is located behind the glove box. Access is achieved by removing the glove box.
Right-hand drive
The TCU is located above the pedals.
Variants
2G
3G
4G
These are found on some 2nd-generation Nissan Leafs. It includes a Sierra Wireless AirPrime AR7554 modem module, a chip labelled R7F7010259 (possibly part of the Renesas RH850/F1L family) and a small PIC16LF1518 chip.
It does not contain a physical SIM slot.
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External view -
Circuit board side A -
Circuit board side B
Connections
| Connector Number | Physical Description | Purpose |
|---|---|---|
| M67 | TH40FB-NH (40-pin connector) | Power, Microphone, CANBUS |
| M173 | USCAR30-MD-M (USB) | USB connection to AV Control Unit |
| M174 | FAKRA CODE H 4003 (Pink) | GSM antenna |
| M175 | 3FA1ANCSJ-C02W0 (Blue) | GPS antenna |