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Inspection [11/2021 - ]: Procedure

  1. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Measure the resistance between connector terminals.
      GTY1051750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Light Control Rheostat)
      - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 - 6 Bright switch OFF 1 MΩ or more
      Bright switch ON Less than 1 Ω
      4 - 6 Always Approx. 4, 710 Ω
      5 - 6 Light control rheostat upward fully open Approx. 510 Ω
      Light control rheostat downward fully open Approx. 4, 610 Ω

      Replace the light control rheostat if it is found defective.

    2. Apply battery voltage between the connector terminals to check lighting condition of illumination inside the switch.
      NOTE:
      • When applying battery voltage, do not mix up the positive (+) side and the negative (-) side.
      • Incorrect polarity connection may cause LED damage inside the switch.

      OK

      Condition Specified Condition
      Battery positive (+) → Terminal 2
      Battery negative (-) → Terminal 3
      Illumination comes on

      Replace the light control rheostat if it is found defective.