Illumination level (for the gauge illumination) indication (Press No. 4 button)

This diagnostic screen checks the gauge illumination input.

With the headlights on, you should see a values between 1 (max low) and 22 (max high).

When you dim and brighten the gauge with the dimmer knob, you should see this value change accordingly.

Fig 1: Screen Display - Illumination Level (For Gauge Illumination) Indication (Press No. 4 Button)

Courtesy of AMERICAN HONDA MOTOR CO., INC.