Note On INTERMITTENTS

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

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

Courtesy of GENERAL MOTORS CORP.

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

Courtesy of GENERAL MOTORS CORP.