Note On INTERMITTENTS

If circuit No. 685 was intermittently grounded, Code B123 could be stored. Manipulate circuit No. 685 wiring while observing BI01 display with dimmer at a low setting. If short occurs, value will switch from HI to LO.

Also check BD42 display. Cycle panel dimming control from minimum to maximum. If BD42 display does not range between 2 and 98 percent or never reads more than 75 percent, replace left switch assembly.

Fig 1: Code B123, Schematic, Panel Lamp Switch Ckt

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code B123, Flow Chart, Panel Lamp Switch Ckt

Courtesy of GENERAL MOTORS CORP.