Note On INTERMITTENTS

If an intermittent Code B119 is being set, check B119 snap data value for twilight photocell, BD44 display. If BD44 display value is less than -31°F (-35°C), code resulted from an open in circuit No. 278 or 736 or photocell. If BD44 display value is less than 2 percent, code resulted from a short to ground on circuit No. 278 or shorted photocell. Manipulate related wiring while observing BD44 display. If failure is induced, reading will jump from its normal value to reading outside range of 2-98 percent. Ensure owner is aware not to cover sensor.

Fig 1: Code B119, Schematic, Twilight Photocell Ckt

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code B119, Flow Chart, Twilight Photocell Ckt

Courtesy of GENERAL MOTORS CORP.