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5 pin mini-USB plug connector layout
5 pin mini-USB plug connector
Pinout compatibility:
  • Garmin Montana 600
  • Garmin Montana 650
  • Garmin Montana 650t
  • Garmin Nuvi 1240
  • Garmin Nuvi 1245
  • Garmin Nuvi 1340LT
  • Garmin Nuvi 1340T CE
  • Garmin Nuvi 1350T
  • Garmin Nuvi 1370Tpro
  • Garmin Nuvi 1390T pro
  • Garmin Nuvi 1450T
  • Garmin Nuvi 1490lmt
  • Garmin Nuvi 1490T
  • Garmin Nuvi 1490tpro
  • Garmin Nuvi 1490tv
  • Garmin Nuvi 1690 nuLink
  • Garmin Nuvi 200
  • Garmin Nuvi 200w
  • Garmin Nuvi 205T
  • Garmin Nuvi 2360LT
  • Garmin Nuvi 2495LMT
  • Garmin Nuvi 250w
  • Garmin Nuvi 255T
  • Garmin Nuvi 255WT
  • Garmin Nuvi 2595lmt
  • Garmin Nuvi 265T
  • Garmin Nuvi 265WT
  • Garmin Nuvi 350T
  • Garmin Nuvi 360T
  • Garmin Nuvi 500
  • Garmin Nuvi 5000
  • Garmin Nuvi 550 Allround
  • Garmin Nuvi 550 Allround
  • Garmin Nuvi 750TFM
  • Garmin Nuvi 760TFM
  • Garmin Nuvi 765T pro
  • Garmin Nuvi 765TFM
  • Garmin Nuvi 770TFM
  • Garmin Nuvi 775TFM
  • Garmin Nuvi 860TFM
  • Garmin Nuvi 865T pro
  • Garmin Zumo 400
Wiring diagram pinout to place Garmin Nuvi, Oregon and GPSMAP 62 GPS in recharge mode.
Pin Pin
Name		 Description
1 +5V 5 volts DC
2 data not connected / float
3 data not connected / float
X GND connected to pin 4 (GND) with 17.3K ohm resistor
4 GND ground

Standard 5 pin mini-USB connector has pin X connect to ground (pin 4) through a 200K ohm resistor (Note: The normal USB connector has only 4 pins, the mini-USB has 5 pins). To place Nuvi into charging mode, the 200K ohm resistor must be changed to 17.3K ohm. (also successful with 22K ohm resistor from Radio Shack, also a cheap 1/8W, 5%, 15k ohm resistor will work just fine!)

Nuvi behavior depends on mini-USB plug connection. (IMHO) it is like this:
pin X not connected - data cable, nuvi connects to PC as removable drive, navigation NOT possible.
pin X & 4 short-circuited - USB supply 500mA, possible navigation,
pin X & 4 connected through 18kOhm resistor - Garmin supply 1A, possible navigation.
pin X & 4 connected through 22kOhm resistor - Garmin supply 500mA, possible navigation.

I personally modified a cable that connected pin X to pin 4 (shorted), and verified the 500 mA charge behavior as noted above.

Nuvi requires 1000mA for simultaneous charging + GPS operation [many 'generic' 12VDC-to-USB adapters output a maximum 500mA]

Garmin Oregon requires a resistor of at least 47K ohm for running in external power supply mode (100K ohm also works). Smaller values are working, too, but Oregon then first shows a message that an unsupported accessory was found.

GPSMAP 62:

pin X not connected - data cable, GPSMAP 62 connects to PC as removable drive.
If it fails because it is connected to your car battery, it switches to external power supply mode after several secondes.

pin X & 4 connected through 47 k Ohm resistor - GPSMAP 62 switches to external power supply mode immediately without waiting.

 

 

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