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Home >> Cadillac >> 2017 >> XTS Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays And Gauges >> Diagnostic Information and Procedures >> DTC B0158: Ambient Air Temperature Sensor Circuit >> Circuit/System Description

Circuit/System Description

For an overview of the component/system, refer to:Instrument Cluster Description and Operation 

Circuit Description
Signal The control module input circuit has an internal resistance connected to 12 V.
Low Reference Grounded through the control module.
Component Description
B9 Ambient Air Temperature Sensor The temperature sensor is a negative temperature coefficient thermistor, a resistor which changes based on temperature.
P16 Instrument Cluster The P16 control module monitors the B9 ambient air temperature sensor.The control module converts the analog voltage signal input to a temperature value.