Component Description

Front air control. 

The front air control has a built-in microcomputer that processes information sent from various sensors needed for air conditioner operation. The air mix door motor, the mode door motor, the intake door motor, the blower motor and the A/C compressor are then controlled.

1. CHECK FRONT AIR CONTROL POWER SUPPLY 
   1. Turn ignition switch OFF.
   2. Disconnect the front air control connector.
   3. Turn ignition switch ON.
   4. Check voltage between front air control harness connector M53 terminals 1, 2 and ground.

      (+)		(-)		Voltage
      Front air control		--		Ignition switch position
      Connector	Terminal			OFF	ACC	ON
      M53	1	Ground		Battery voltage	Battery voltage	Battery voltage
      	2			Approx. 0 V	Approx. 0 V	Battery voltage

   Is the inspection result normal?

   YES

   GO TO 3.

   NO

   GO TO 2.

2. CHECK FUSE 

   Check 10 A fuses [Nos. 12 and 19, located in the fuse block (J/B)].

   NOTE: Refer to appropriate system Wiring Diagram.

   Is the inspection result normal?

   YES

   Check harness for open circuit. Repair or replace if necessary.

   NO

   Check harness for short circuit. Repair or replace if necessary.

3. CHECK FRONT AIR CONTROL GROUND CIRCUIT 
   1. Turn ignition switch OFF.
   2. Check continuity between front air control harness connector M53 terminals 3, 4 and ground.

      3, 4 - Ground

      : Continuity should exist.

   Is the inspection result normal?

   YES

   Replace the front air control. Refer to Removal and Installation - Front Air Control .

   NO

   Repair the harnesses or connectors.