Air Conditioning Control Assembly: Inspection

WARNING: This page is about a different car, the 2005 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

w/o Navigation system: INSPECT ILLUMINATION OPERATION
1. Connect the positive (+) lead from the battery to terminal C10 and negative (-) lead to terminal C19, then check that the indicators illuminate.
  If operation is not as specified, check the faulty bulb.
  
  Fig 1: Connecting Battery To Terminals C10 & C19
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the bulb.
3. Using the tester as shown in Fig 2 , test the continuity.
  If continuity exists, replace the heater control.
  
  If no continuity exists, replace the bulb.
  
  Fig 2: Testing Continuity Using Tester
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
w/o Navigation system: INSPECT INDICATORS OPERATION
1. Connect the positive (+) lead from the battery to terminal C22 and negative (-) lead to terminal C12.
  
  Fig 3: Connecting Battery To Terminals C22 & C12
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the indicators come on while operate the switches.
  If operation is not as specified, replace the heater control.
INSPECT A/C CONTROL ASSEMBLY CIRCUIT (See TERMINALS OF ECU )
w/ Navigation system: INSPECT ILLUMINATION OPERATION
1. Connect the positive (+) lead from the battery to terminal A8 and negative (-) lead to terminal A16.
  
  Fig 4: Connecting Battery To Terminals A8 & A16
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that the indicators come on while operating the switches.
  If operation is not as specified, replace the heater control.
INSPECT A/C CONTROL ASSEMBLY CIRCUIT (See TERMINALS OF ECU )