DESCRIPTION The air mix damper servo motor (for passenger side) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air mix damper (for passenger side) to any position. As a result the amount of air that has passed through the evaporator and is now passing through the heater core is adjusted, and the temperature of the air blowing toward the passenger side is controlled.
WIRING DIAGRAM 
PROCEDURE
(a) Use the Data List to check if the servo motor is functioning properly. Air Conditioner
OK: The display is as specified in the normal condition. Result
(a) Temporarily replace the air mix servo motor with a new one (see page
HINT: Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new one and check that the condition returns to normal.
(a) Clear the DTC (see page (b) Check for DTC (see page OK: DTC is not output.
(a) Replace the air conditioning harness.
(a) Clear the DTC (see page (b) Check for DTC again (see page OK: DTC is not output.
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Toyota Tundra Service Manual > Touch Select 2-4 And High-low System: Diagnosis System
DIAGNOSIS SYSTEM 1. DESCRIPTION The 4 wheel drive control ECU records DTCs when the ECU detects a malfunction in the ECU itself or in system circuits. The DTCs can be read through the DLC3 of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and pe ...
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