Combination Meter: Inspection

WARNING: This page is about a different car, the 2003 Lexus GX 470. However, it is still accessible from the selected car via links, so may be relevant.

LIGHT CONTROL RHEOSTAT ASSY
1. Check the continuity of light control rheostat when light control rheostat operation as shown in chart below.
  Standard:
  
  Fig 1: Identifying Light Control Rheostat Specified Condition Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check resistance.
  1. Check the resistance between terminal 4 (RV) and terminal 3 (T) when operating the light control rheostat volume knob. Also, check that the resistance changes continuously.
    Standard Resistance:
    
    Turn the knob to maximum: Approx. 10 kΩ
    
    Turn the knob to minimum: Approx. 0 kΩ
    
    Fig 2: Identifying Light Control Rheostat Connector Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 3: Rheostat Resistance Graph
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002