Casio 5600 LCD Test Screen

Casio G-Shock Secret Features and Hidden Screens

Posted by Mike Johnson on in Tutorials

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gshock_button_reference Casio G-shocks are fun and affordable digital watches that pack a surprising amount of useful features. World time, stopwatch, timer, tide-graph, and moon phase are just a few of the things an ordinary G-shock is capable of. What’s even better, most G-Shock owners aren’t even aware of some of their watches have hidden and secret capabilities.

In this article, we’ll explore some of the lesser known Casio G-shock secret features along with some interesting diagnostic modes that can help you discover functionality and even find potential problems.

See also: Our Complete G-Shock “Master of G” Collector’s Guide.

LCD Display Test

Casio G-Shock LCD Display Test Mode

Casio G-Shock LCD Display Test Mode

Just like a car’s dashboard, most Casio G-Shock models have an LCD test that will illuminate every possible segment of the LCD display. This can help you determine if there is any damage to a particular display function that might prevent you from knowing if it’s activated or not. This is also a neat way to see all of the hidden display features embedded in your watch.

To access LCD diagnostic mode:

  • In timekeeping mode, press buttons (A), (C) and (D) simultaneously
  • All segments of the LCD display will activate
  • Press (D) to cycle through display test modes
  • Last screen will show Casio module number
  • Press any button to return to normal

Tilt Sensor Test Screen

Casio G-Shock Tilt Sensor Diagnostic Mode

Casio G-Shock Tilt Sensor Diagnostic Mode

All Casio models with the auto-illumination feature use a basic tilt sensor to determine the position of the watch face. If you’re having problems with your Auto-EL, you may have a faulty tilt sensor. Luckily, Casio engineers have built in a tilt-sensor diagnostic mode that you can use to diagnose potential problems.

To access the tilt-sensor diagnostic screen:

  • In timekeeping mode, press buttons (A), (B) and (C) simultaneously
  • The screen will display TLT
  • The display will show ‘8888’ when the sensor is activated
  • Press any button to return to normal

Our 4 Favorite G-Shocks

Solar Panel Test

Casio G-Shock Solar Sensor Diagnostic Mode

Casio G-Shock Solar Sensor Diagnostic Mode

G-Shock models with the “tough solar” designation use special batteries and an array of small solar panels to stay charged. If you’re having problems charging your watch even when it’s exposed to direct sunlight, you may have damaged your solar panels. To test if your solar panels are functional, you can use the built in solar diagnostic mode.

To access the solar diagnostic screen:

  • In timekeeping mode, press buttons (A), (B) and (D) simultaneously
  • The screen will display SLR
  • The display will show ‘8888’ when the solar cell is receiving light
  • Press any button to return to normal

If the battery is completely charged, the solar panels may not accept additional sunlight.

Power Saving Mode

Casio G-Shock Power Saving Mode

Casio G-Shock Power Saving Mode

Another great feature buried in the Casio G-Shock manual is the ability to automatically conserve power when not in use. The power-saving feature will automatically turn off the display after 60-70 minutes of inactivity. In this sleep mode, all other functions of the watch (including alarm and radio sync) remain active. After 6 or 7 days of inactivity, the watch will go into “deep sleep” mode which turns off auto-receive, beeps and tones, illumination, and display.

To turn on power saving mode:

  • In time-keeping mode, hold down button (A) until the city code starts to flash
  • Press (C) nine times until power settings screen appears (will display PS)
  • Press (D) to toggle on or off
  • Press (A) again to set and exit


G-Shock Auto Illuminator Mode Activated

G-Shock Auto Illuminator Mode Activated

This is probably one of the better-known hidden features of the Casio G-Shock, but still one that many people don’t realize exists. Most G-Shocks with the backlight illumination feature actually have an “auto-illumination” mode, a nifty feature that automatically illuminates the watch when it is tilted towards your face 15 degrees. Although this feature is known to drain your battery faster, it’s smart enough to disable itself if the watch falls below full charge. Additionally, the feature will only remain active for six hours before needing to be re-activated manually.

To turn on auto-illumination:

  • Hold down button (B) for 3 seconds
  • The wording “A. El” will appear on the dial if successful
  • Hold down button (B) for 3 seconds to manually disable, otherwise it will self-disable after 6 hours.

Unfortunately, not all Casio watches have access to these hidden or secret features. The only way to know if your watch can do the above is to test it yourself.

We hope you enjoyed this quick tutorial on accessing secret and hidden features inside your Casio G-shock, please post any secret or hidden functions we may have missed in the comments below!

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About the Author
Mike Johnson

Mike Johnson

Mike Johnson is the managing editor and primary contributor to Born into a military family as the son of US Navy pilot, Mike spent many of his formative years studying Computer Science and User Experience Design. When not obsessing over watches, Mike spends time hiking, traveling, and spending time with his family in Phoenix, Arizona.

Comments 4

  1. VangelisA

    I own CASIO’S (G-Shock mostly) from 1983 and it’s the first time to know about these diagnostic tricks.Very important and helpfull.Thanks.
    I made the “Tilt Sensor Test Sceen” to one of my recent G-Shocks (GW-5510-1) and 8888 never appeared.I know that the AUTO-EL doesn’t work from a moment and after, but I wanted to make the test anyway.
    All other tests OK.Any idea about the Tilt Sensor not working??
    I try to find new module to replace it but I can’t find a seller.
    Any help will be much appreciated.

    1. Mike Johnson Post
      Mike Johnson

      Hmm, that’s a tough one. If your watch is from 1983, you’ve got an original model. Not only is it 34 years old, but it was the first generation G-shock. It’s likely the tilt sensor just no longer works, which would also cause the Auto-EL not to work. I’m not sure you can fix that without replacing the entire module, so I would just live with it as a quirk of a really unique vintage digital watch.

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