Note On INTERMITTENTS

If an intermittent Code B111 is being set, check Code B111 snap data value for high side temperature, BD27 display. If BD27 display value is less than -22°F (-30°C), code was caused by an open in circuit No. 732 or 736 or high side temperature sensor. If BD27 value is greater than 363°F (184°C), code resulted from a short to ground on circuit No. 732 or a shorted high side temperature sensor. Manipulate related wiring while observing BD27 display. If failure is induced, reading will jump from its normal value to a reading outside range of -22°F to 363°F (-30°C to 184°C).

If BD27 value is not reasonably close to corresponding gauge pressure reading, check for poor terminal contact or replace sensor.

Fig 1: Code B111, Schematic, A/C High Side Temp Sens Ckt

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code B111, Flow Chart, A/C High Side Temp Sens Ckt

Courtesy of GENERAL MOTORS CORP.