Note On Intermittents

If an intermittent Code B122 is being set, check B122 snap data value for twilight delay BD42 display. If BD42 display value is greater than 98 percent, code resulted from an open in circuit No. 686 or 736, or left switch pod. If BD42 display value is less than 2 percent, code resulted from a short in left switch pod. Manipulate related wiring while observing BD42 display. If failure is induced, reading will jump from its normal value to a reading outside the range of 2-98 percent.

Fig 1: Code B122, Schematic, Panel Dimming Potentiometer Circuit

Fig 2: Flow Chart, Code B122, Panel Dimming Potentiometer Circuit