Why Do I have Satnav Charger Problems?

Discussion in 'Garmin GPS' started by Nuvi-Nebie, Mar 4, 2021.

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  1. Nuvi-Nebie

    Nuvi-Nebie Moderator

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    Background
    Users sometimes have problems charging their Satnav or other Garmin devices when not using the supplied Garmin charger / cable, the reason for this is that some Garmin units use special cables to set different 'Modes' on the unit.

    usb1s.jpg
    FIG1

    A normal USB Mini or Micro cable looks FIG 1, you will notice that the end that connects to Garmin has 5 pins not 4, this is standard to all USB mini and Micro connectors, it has always been there, but the 'ID' pin is not normally connected to anything, Garmin use the ID pin on some units to set the mode that the unit works in, NOTE other Garmin models do-not use the ID pin at all.

    The units that use the ID pin have a cable that look like Fig 2 :-

    usb2s.jpg
    Fig2

    The ID pin is now connected via a Resistor to ground (GND) and the voltage on the ID pin is monitored by the unit to set the 'mode', It has been reported that an 18K Ohm resistor will place the unit in 1A charge mode and that zero Ohm will place the unit in 500mA charge mode


    It is possible to check the charge mode (I Limit USB) on some units by holding the battery icon (top right) until a secret menu is displayed

    DSCN3466s.JPG
     
    Nuvi-Nebie, Mar 4, 2021
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