DTC CHECK / CLEAR 1. CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air conditioner / Trouble Codes. (e) Check for DTCs. 2. CLEAR DTC (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch ON. (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Air conditioner / Trouble Codes. (e) Clear the DTCs. 3. INDICATOR CHECK 
(a) Press and hold the A/C control AUTO switch and Recirculation / Fresh switch simultaneously, and turn the ignition switch ON. Continue holding the 2 switches until the panel diagnosis mode begins. 
(b) Check that all indicators turn on and off 4 times in succession at 1 second intervals. HINT:
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Toyota Tundra Service Manual > Air Conditioning System(for Automatic Air Conditioning System): Solar Sensor Circuit (Passenger Side) (B1421/21)
DESCRIPTION The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in AUTO mode. The output current from the solar sensor varies according to the amount of sunlight. When the sunlight increases, the output current increases. ...
