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Home >> Lexus >> 2000 >> SC 300 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Automatic A/C-Heater Systems >> Diagnostic Tests >> DTC 11: In-Vehicle Temperature Sensor Circuit >> Sensor Resistance Test

Sensor Resistance Test

  1. Remove left instrument panel undercover. Unplug in-vehicle temperature sensor. See Figure. Measure resistance between in-vehicle temperature sensor terminals while heating sensor. See IN-VEHICLE TEMPERATURE SENSOR RESISTANCE SPECIFICATIONS  table.
  2. If resistance is not as specified, replace sensor. If resistance is within specification, inspect wiring harness and connectors between sensor and A/C-heater control panel. Repair as necessary. If wiring harness and connectors are okay, temporarily substitute a known-good A/C-heater control panel, then retest system.
IN-VEHICLE TEMPERATURE SENSOR RESISTANCE SPECIFICATIONS

Sensor Temperature - °F (°C) (1) Ohms
77 (25) 1600-1800
122 (50) 500-700
(1) As temperature increases, resistance should gradually decrease.
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