Combination Meter: Inspection

WARNING: This page is about a different car, the 2004 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.
  
  Fig 1: Identifying Terminals Of Light Control Rheostat
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard:
  
  Fig 2: Light Control Rheostat Terminals Continuity
  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:
  1. Turn the knob to maximum: Approx. 10 kΩ
  2. Turn the knob to minimum: Approx. 0 kΩ
  Fig 3: Light Control Rheostat Resistance graph
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002