This 2002 Honda Accord came in with the complaint that the blower worked but nothing else on the a/c control assembly worked or would even light up. I started by checking the #3 fuse in the driver’s side interior fuse box (7.5 amp) and the #13 fuse in the passenger side interior fuse box (7.5 amp). Both fuses were good. Time to remove the a/c control assembly for testing of the harness. First I removed the two lower retaining screws.
Then I used a small screwdriver to pop the clock and hazard switch assembly from the dash.
With the panel removed I could now access the one hidden screw and pulled the panel with the a/c control assembly out of the dash.
I then removed the control assembly from the panel.
Then reconnected it to the wiring for testing.
I had to disconnect the control assembly to get better pictures of the wires. First I checked for ignition power on the black/yellow wire at position 2. Good
Then I checked for battery power on the white/yellow at position 3. Good
Then I checked for continuous ground on the black wire at position 9. Good
Diagnosis and replacement of faulty a/c control assembly.
Sorry, I do not have a silver bullet answer for you. Start by checking to make sure the vents are not closed. Then someone will need to inspect the actuator/doors to determine the cause of the malfunction.