Control Assembly: Description and Operation

Temperature Control Switch




By turning the temp. control switch, the set temperature of the A/C can be adjusted in steps of 1°F (USA) or 0.5°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 (5V) or Low (0V) 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.

Automatic Control Switch





The SW contact is ON while the automatic control SW is pushed, and turns OFF when automatic control SW is released. When the SW is turned ON, the voltage at the SAUTO terminal of A/C control assembly is almost 0 V and the ECU begins fully automatic control of the blower speed, air inlet, air outlet and compressor operation.