Tundra 2WD V6-3.4L (5VZ-FE) (2004)
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a. Check the continuity exists between terminals 1 and 3 of blower switch connector, when turn the mode selector to DEF. position and F/DEF.
position.
If no continuity exists, proceed to next step.
b. Check the continuity exists between terminals of A/C mode switch.
If no continuity exists, replace the A/C mode switch.
If continuity exists, check or replace heater control housing base.