Temperature Control Switch Circuit

By turning the temp. control switch, the set temperature of the A/C can be adjusted in steps of 1°F (USA) or O.5°C (Canada). Turning the switch fully will set the A/C to MAX. COLD or MAX. HOT.
The ECU calculates the set temperature from the combination of Hi (5 V) or Low (0 V) terminals SET 1 - 5 of the temp. control SW and displays the set temperature on the LCD display.

If a malfunction occurs in the temp. control SW circuit, malfunctions such as not being able to set the desired temperature occur.

Diagnostic Chart:

Wiring Diagram:

Inspection Procedure - Step 1:

Step 2:

Step 3: