Air Conditioning Control Assembly: Inspection

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: Checking Indicator Illumination Operation (W/O Lexus Navigation System)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the bulb (See DISASSEMBLY ).
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: Checking Indicator Bulb Continuity

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT INDICATORS OPERATION 

1. Connect the positive (+) lead from the battery to terminal C22 and negative (-) lead to terminal C12.
2. Check that the indicators come on while operate the switches.

Fig 3: Inspecting Indicators Operation (W/O Lexus Navigation System)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If operation is not as specified, replace the heater control.

INSPECT INDICATORS OPERATION 

1. Connect the positive (+) lead from the battery to terminal A8 and negative (-) lead to terminal A16.
2. Check that the indicators come on while operating the switches.

Fig 4: Inspecting Indicators Operation (W/ Lexus Navigation System)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If operation is not as specified, replace the heater control.