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Home >> Toyota >> 2004 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 452 (Air Conditioning System - Diagnostics) >> Circuit Inspection >> DTC 21: Solar Sensor Circuit >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2002 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Graphing Solar Sensor's Resistance By Level Of Sunlight Exposure
G01112350Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

A photo diode in the solar sensor detects solar radiation and sends signals to the A/C amplifier.

Fig 2: Identifying DTC 21 Trouble Areas
G01112351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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