COMBINATION METER (From July, 2003): Inspection

WARNING: This page is about a different car, the 2004 Lexus ES 330. However, it is still accessible from the selected car via links, so may be relevant.

LIGHT CONTROL RHEOSTAT ASSY
1. Inspect continuity.
  1. Check the continuity between the connector terminals when operating the rheostat volume knob.
  Standard:
  
  Fig 1: Identifying Rheostat Volume Knob Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 2: Identifying Terminal Continuity Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check resistance.
  1. Check the resistance between terminals 4 (RV) and 3 (T) when operating the rheostat volume knob. Also, check that the resistance change continuously.
    Standard resistance:
    
    Turn the knob to maximum - Approx. 10 kΩ
    
    Turn the knob to minimum - Approx. 0 kΩ
    
    Fig 3: Rheostat Volume Knob Resistance Graph
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002