Air Conditioning Control Assembly (Center Cluster Integration): Inspection

WARNING: This page is about a different car, the 2002 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.

Inspect illumination operation.
1. Connect the positive (+) lead from the battery to terminal B7 and negative (-) lead to terminal A8 then check that the illuminations lights up.
  
  Fig 1: Inspecting Illumination Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. If operation is not as specified, check the faulty bulb.
Inspect bulb.
1. Apply the tester as shown in Fig 2 to test for continuity.
  
  Fig 2: Testing Continuity
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. If continuity exists, replace the heater control.
3. If no continuity exists, replace the bulb.
Inspect A/C switch continuity.

Fig 3: Displaying A/C ON Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Checking A/C Switch Continuity Based On Conditions
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If operation is not as specified, replace integration circuit bulb.
Inspect A/C indicator operation.
1. Connect the positive (+) lead from the battery to terminal A12 and negative (-) lead to A1.
  
  Fig 5: Displaying Connections For A/C Indicator Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Push the A/C button in and check that the A/C indicator lights up.
  If operation is not as specified, replace the integration circuit.
3. Connect the positive (+) lead from the battery to terminal A11 and negative (-) lead to terminal A10, then check that the indicator dimes.
  
  Fig 6: Displaying Connections For A/C Indicator Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the integration circuit.
Inspect air inlet control switch continuity.

Fig 7: Displaying Terminals & Air Inlet Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 8: Checking Air Inlet Control Switch Continuity Based On Conditions
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If operation is not as specified, replace integration circuit bulb
Inspect air inlet indicator operation.
1. Connect the positive (+) lead from the battery to terminal A4 and negative (-) lead to A1.
  
  Fig 9: Displaying Connections For Air Inlet Indicator Light Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Push the air inlet button in and check that the air inlet indicator lights up.
  If operation is not as specified, replace the integration circuit.
3. Connect the positive (+) lead from the battery to terminal A11 and negative (-) lead to terminal A10, then check that the indicator dims.
  
  Fig 10: Displaying Connections For Air Inlet Indicator Light Dimming
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If operation is not as specified, replace the integration circuit.