Envoy 2WD V6-4.3L VIN W (1998)
Data
Range: Light/Dark
The displayed value refers to the amount of ambient light level calculated by the BCM using the light sensor.
The information is used by the BCM for operation of the following features:
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The automatic headlamp feature
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The daytime running lamps (DRL) feature The BCM supplies 5 volts to the ambient light photocell sensor and receives a return signal voltage
from the ambient light photocell sensor on the return signal circuit.
The following actions will occur if there is an open or a short to ground in the ambient light sensor circuit:
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The scan tool will display DARK.
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The BCM will default into a DARK state and turn the headlamps ON.
If the headlamps are set to the AUTO position while in the LIGHT state and the ambient light level conditions change to DARK for 15 seconds, the
BCM will turn the headlamps ON.
If the headlamps are set to the AUTO position while the DARK state and the ambient light level conditions change to LIGHT for 20 seconds, the BCM
will turn the headlamps OFF.
Dusk
