Instrument cluster illumination, location/function

Instrument cluster display illumination

The illumination of the instrument cluster (A1) switches on automatically when it is activated. It is activated when the driver's door is opened or the trip odometer reset button (A1s3) is pressed, for example.

The brightness of the illumination depends on:

 the brightness of the surroundings

 the status of terminal 58K (side light On/Off)

 the dimmer setting via the buttons for instrument and search illumination (bright) (dark) (A1s4, A1s5)

Brightness of display illumination when side light is on (terminal 58k On)

A distinction is to be made between two cases depending on the brightness of the surroundings which is measured by the phototransistor (p):

 The phototransistor controls the brightness of the display above a defined threshold value of the brightness of the surroundings. The brightness of the display increases as the brightness of the surroundings increases, the dimmer setting does not have any influence.

 Below the threshold value, the brightness of the display depends on the brightness of the surroundings and on the dimmer setting, with the higher value applying.

Brightness of display illumination when side light is off (terminal 58k Off)

The brightness of the display only depends on the brightness of the surroundings via the phototransistor. The brightness of the display can assume values from the threshold value up to maximum brightness. The dimmer setting does not have any influence.

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When the brightness of the surroundings changes the brightness of the display only changes after approx. 3 seconds.