Display instruments/multi-function display function check IC - AD54.30-P-3000-03A

Display instruments 

The display instruments must indicate according to operating conditions.

Phototransistor (models 202, 208, 210) 

Point a beam of light at the phototransistor with a pocket lamp, the display illumination of the LCD displays (outside temperature, trip odometer, total mileage recorder and electronic clock) must get brighter.

Instrument cluster with multi-function display 

If there are malfunctions (e.g. brake linings worn, coolant level too low, exterior lamp failure etc.) or system faults (anti-lock brake system faulty, supplemental restraint system faulty) the warning display with warning information is inserted in place of outside temperature, odometer, total mileage recorder and electronic clock. The warning information is displayed in yellow or red depending on the fault and a warning tone also sounds.