HOW TO PROCEED WITH TROUBLESHOOTING HINT: This is a flowchart for vehicle pull. 
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Toyota Tundra Service Manual > Air Conditioning System(for Manual Air Conditioning System): Ambient Temperature Sensor Circuit (B1412/12)
DESCRIPTION The ambient temperature sensor is installed in front of the condenser to detect the ambient temperature. This sensor is connected to the air conditioning amplifier and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sen ...
