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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting Systems >> Diagnostic Information and Procedures >> DTC B1397: 5 Volt Reference Output Circuit Low >> Circuit Description

Circuit Description

The body control module (BCM) provides a constant output reference voltage of 5 volts for the proper operation of the ambient light sensor. The constant output reference voltage supply ensures that variations in the output signal of the ambient light sensor are due to changes of the sensor rather than variations in the voltage supply. The BCM monitors the constant output reference voltage and sets a DTC when the output is not within the expected range of 4.75-5.25 volts.

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