Note On Intermittents

If intermittent Code F12 is being set, manipulate related wiring while observing BCM data parameter P.2.8. If failure is induced, reading will jump from its normal value to a reading outside range of -29°F to 189°F (-34°C to 87°C).

If value displayed by data parameter P.2.8 is not reasonably close to corresponding gauge pressure reading, check for poor terminal contact or replace sensor.

Fig 1: BCM Code F12 Schematic - A/C Low Side Temp. Sensor Ckt.

Courtesy of GENERAL MOTORS CORP.

Fig 2: BCM Code F12 Flow Chart - A/C Low Side Temp. Sensor Ckt.

Courtesy of GENERAL MOTORS CORP.