USB Power Outlet Inspection

Switch the ignition ON (engine off).
Measure the voltage between the USB port power supply and GND.

Courtesy of MAZDA MOTORS CORP.

If the voltage is from 4.75 V to 5.25 V:
- The USB power outlet is normal.
  If the voltage is less than 4.75 V or higher than 5.25 V:
- Replace the USB power outlet. (See USB POWER OUTLET REMOVAL/INSTALLATION .)