Editing Telematics Control Unit (TCU) (section)

=== 4G ===

Known part numbers:

* 28275 5SA0A
* 28275 5SA0B
* 28275 5ZA0D
* 28275 6FL0B

These are found on some 2nd-generation Nissan Leafs. The one pictured below (p/n 28275 5SA0B) includes a Sierra Wireless AirPrime AR7554 modem module, a chip labelled R7F7010259 (possibly part of the Renesas RH850/F1L family), a small PIC16LF1518 chip, an A1051/3 CAN transceiver chip, an A1043 CAN interface chip (this list is not exhaustive). An examination and probe of the board while powered on did not reveal any obvious UART terminals, however it does emit CAN data while powered on on a bench.

It does not contain a physical SIM slot.

The unit photographed below is not detected as a USB device when connected to a computer. It may be faulty, or in some kind of disabled mode, or a non-standard USB protocol, I am not sure.

In vehicles which have had an English conversion done by EVs Enhanced, the [[AV Control Unit]] may not function while the TCU is disconnected (complaining about a missing or invalid key file).

<gallery widths="160" heights="160">
File:Gen 2 4G TCU - top view.jpg|External view
File:Gen 2 4G TCU Circuit Board Side A.jpg|Circuit board side A
File:Gen 2 4G TCU Circuit Board Side B.jpg|Circuit board side B
</gallery>

==== Connections ====
{| class="wikitable"
|+
!Connector Number
!Physical Description
!Purpose
|-
|M67
|TH40FB-NH (40-pin connector)
{| class="wikitable"
|-
|[[File:ZE1 M67 Connector.png|frameless]]
|}
|Power, Microphone, CANBUS ([[IT-CAN]] and [[M-CAN]])
|-
|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
|}

==== M67 Pinout ([[NAM]]) ====

{| class="wikitable"
! Terminal No.
! Color of Wire
! Signal Name
|-
| 1 || W || +VBAT
|-
| 2 || R || ACC
|-
| 3 || BR || ACC OUT
|-
| 5 || LA/L || LED GREEN
|-
| 6 || SB || CAN-H
|-
| 7 || V || CAN-L
|-
| 8 || – || –
|-
| 9 || – || –
|-
| 10 || G || WAKE UP/IGN
|-
| 11 || SHIELD || MIC OUT GND
|-
| 12 || L || MIC OUT SIGNAL
|-
| 13 || – || –
|-
| 14 || – || –
|-
| 15 || – || –
|-
| 16 || SHIELD || MIC GND
|-
| 17 || L || MIC SIGNAL
|-
| 18 || P || MIC VCC
|-
| 19 || – || –
|-
| 20 || – || –
|-
| 21 || – || –
|-
| 22 || – || –
|-
| 23 || – || –
|-
| 24 || – || –
|-
| 25 || – || –
|-
| 26 || SB || M CAN-H
|-
| 27 || LG || M CAN-L
|-
| 28 || B || GND
|-
| 29 || B || GND
|-
| 30 || – || –
|-
| 31 || G || AUDIO HU OUT+
|-
| 32 || R || AUDIO HU OUT–
|-
| 33 || – || –
|-
| 34 || – || –
|-
| 35 || – || –
|-
| 36 || – || –
|-
| 37 || LA/Y || ECALL SW
|-
| 38 || – || –
|-
| 39 || – || –
|}