Furby (1998)/Diagnostic mode

The 1998 Furbys and 1999 Furby Babies feature a factory test mode which allows testing the Furby's sensors and some of the internal hardware as well.

PLEASE NOTE that the diagnostic mode clears the EEPROM, so the name of your Furby and all of the English that they have learned will be reset.

Entering the diagnostic mode[]

While simultaneously holding down the Furby's tummy and back switches, press the reset button on the bottom.
On adult Furbys, a loud beep will be produced until the buttons are released. Furby Babies will say “Here’s baby!” instead.
A testing sequence will start.

Infrared communication diagnostics[]

To enter the IR test mode, press the tummy and then the back switch. A low tone will be emitted until the back switch is pressed again. On repeated presses, an infrared packet (#5, "Party!") will be transmitted. In this mode, the Furby also expects to receive this message as well, which can be achieved by using another Furby or, for example, an appropriate remote control.

To return to the main menu, simultaneously hold the tummy and the back switches.

Physical Diagnostics[]

To access this mode, press the Furby's tummy. This should be followed by a high-pitched tone and three mid-range tones. After the Furby is tilted in any direction, three mid-range tones will be emitted, while turning it upside down will cause the Furby to emit a low sound until returned to an upright position.

After the tilt sensor is tested, applying a tilt and holding down the back switch triggers a continuous motor movement. Pressing the tummy reverses the direction of the motor. Pressing the back switch cause a few cycles back and forth followed by three beeps. This verifies operation of the servo sensors (optoencoder and the sync switch).

After the above, pressing the tummy switch will cause three further beeps; afterwards the Furby will open its mouth. At this stage:

Pressing the tongue causes a short movement and three beeps; afterwards, the mouth closes.
Covering the forehead (light sensor) makes the Furby move into the sleeping position; three beeps will be produced.
Activating the microphone (by clapping, for example) moves the Furby into the original packaging position (eyes and mouth open, ears up).

On localized Furbys[]

Instead of an initial beep, a localized 1998 Furby will repeat a word announcing the localization language in a generic voice. Furby Babies will use one of the regular Furbish phrases instead.