SD Card Toolbox – Nissan Leaf navigation interface

Nissan Leaf SD Cards used in Clarion navigation units are protected with password and it has been reviewed earlier in this post NISSAN LEAF SD card protection. How to obtain SD card password?

Here we will share the SD Toolbox upgrade details for password reading from Clarion navigation unit using debug interface. After some simple modifications in hardware, any SD Toolbox with the latest firmware can be used for this task.

Add missing components on PCB

Just a few components must be added on both sides of the PCB:

    1. PCB bottom side
      • R18 – 1 kOhm
    2. PCB top side
      • R20 – 270R
      • R21 – 0R
      • R13, R15, R19 – 47R
      • Q1-Q4 – BSS123
Add connector on PCB

Build cable

If this interface will be used more frequently, it’s recommended to use the connector on the SD toolbox and build the cable with a navigation connector. Otherwise, some single test wires can be used to connect the navigation unit.

If a detailed connector pinout is required, it can be found in this post: NISSAN CAN filter installation

Reading SD card password from the navigation unit
There is one condition for successful reading of the password: the navigation unit must be at room temperature (it will not work on a cold unit due to some nuances in schematics)
The video on how to read out the SD card password is below.


  1. Sir,

    Do have any more information on the Clarion Navigation Unit Debug Interface?



  2. Sir,

    Do you have information on the subsystems that can be accessed via the Debug Interface?



    • Hi,

      There are several test modes, software start from reserve copy, internal memory access and other. Write me what you are trying to find out or what are your goals and i will help on it if i can.

    • Password for it can be read in similar ways as for Leaf navigation. I don’t know about debug interface on the NXR10 unit, as I never had it myself.
      The fastest and cheapest way to read password is to use logic analyzer and sniff it on the SD card interface.

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