Test Procedure
- BCM data value BD44 displays light level. The normal range is from 3-98%.
- If the open circuit reading changes to a shorted circuit reading after jumping the sensor terminals, the BCM and wiring are okay.
- By applying a ground to various points in the circuits, an open can be isolated by observing whether the parameter display can be changed from the open reading to the shorted reading.
- Checks to see if the shorted circuit reading is due to the circuit or the sensor. If the shorted circuit reading changes to an open circuit reading after disconnecting the sensor, the BCM and wiring are okay.
Courtesy of GENERAL MOTORS CORP.
Courtesy of GENERAL MOTORS CORP.