Illumination Level (for the Gauge Illumination) Indication (press No. 4 button)

This diagnostic screen checks the gauge illumination input.

With the headlights on, use the dimmer knob to dim and brighten the gauge. You should see the value change from 1 (max low) to 22 (max high). If it does not change, go to Display does not dim or brighten with dimmer troubleshooting.

Display Message	Vehicle Test Condition	Remarks
A-Diag 22	Headlights switch is in parking light position and dashlights brightness is max high.
A-Diag -^*	Headlights switch is in parking light position and dashlights brightness is max low.

*: The display screen is black when the dashlight brightness is max low.