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Home >> Lexus >> 2009 >> GX 470 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge (Diagnostics - Introduction) >> Meter / Gauge System >> Ambient Temperature Does Not Display >> Procedure

Ambient Temperature Does Not Display: Procedure

  1. INSPECT THERMISTOR ASSEMBLY 
    1. Remove cooler (ambient temp. sensor) thermistor.
      Fig 1: Identifying Cooler (Ambient Temp. Sensor) Thermistor Connector Terminals
      GTY155875Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure resistance between terminals 1 and 2 of cooler (ambient temp. sensor) thermistor connector at each temperature.
      Fig 2: Measuring Resistance Between Terminals 1 & 2 Of Cooler (Ambient Temp. Sensor) Thermistor Connector
      GTY156328Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT: 

      As the temperature increases, the resistance decreases.

      Standard resistance

      Temperature °C (°F) Specification kΩ
      10 (50) 3.00 to 3.73
      15 (59) 2.45 to 2.88
      20 (68) 1.95 to 2.30
      25 (77) 1.60 to 1.80
      30 (86) 1.28 to 1.47
      35 (95) 1.00 to 1.22
      40 (104) 0.80 to 1.00
      45 (113) 0.65 to 0.85
      50 (122) 0.50 to 0.70
      55 (131) 0.44 to 0.60
      60 (140) 0.36 to 0.50

    NG → REPLACE THERMISTOR ASSEMBLY 

    OK: Go to next step 

  2. CHECK HARNESS AND CONNECTOR 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE ACCESSORY METER ASSEMBLY