For 1990-2009 cars

Step | Action | Values | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 |

1. Remove the automatic temperature controller (ATC) from the instrument panel (I/P), keeping the wiring harness connected.
2. Turn ON the ignition, with the engine OFF.
3. Turn the alternating current A/C switch to ON.
4. Inspect the voltage between ground and terminal A11 on the controller.

Is the voltage within the specified value?

11-14 V

Go to Too Hot in Vehicle or Too Cold in Vehicle

Go to Step 3

3 | Replace the ATC. Refer to Heater and Air Conditioning Control Replacement . Is the repair complete? | -- | System OK | --