Tundra Regular Cab SR5 4WD V8-47L HVAC Control Assembly Component Inspection
5. INSPECT AIR INLET CONTROL SWITCH CONTINUITY
If operation is not as specified, replace integration circuit bulb
6. INSPECT AIR INLET INDICATOR OPERATION
a. Connect the positive (+) lead from the battery to terminal A4 and negative (-) lead to A1.
b. 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.
c. Connect the positive (+) lead from the battery to terminal A11 and negative (-) lead to terminal A10, then check that the indicator dimes.
If operation is not as specified, replace the integration circuit.
Heater Control