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Home >> Lexus >> 2001 >> LX 470 >> Repair and Diagnosis >> External Pages >> Different car >> Section 2 (Automatic A/C-Heater Systems) >> Component Tests >> Ambient Temperature Sensor

Ambient Temperature Sensor

WARNING: This page is about a different car, the 2001 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect ambient temperature sensor, located behind radiator, above cooling fan. Measure sensor resistance while heating sensor. See AMBIENT TEMPERATURE SENSOR RESISTANCE SPECIFICATIONS  table.
  2. If resistance is not as specified, replace sensor. If resistance is within specification, check wiring harness and connectors between sensor and A/C control assembly. Repair harness and connectors as necessary. If wiring harness and connectors are okay, substitute a known-good A/C control assembly. Retest system.
    AMBIENT TEMPERATURE SENSOR RESISTANCE SPECIFICATIONS

    Sensor Temperature - °F (°C) (1) Ohms
    77 (25) 1600-1800
    144 (40) 500-700
    (1) As temperature increases, resistance should gradually decrease.
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