Operational Check

INSPECTION AND ADJUSTMENT

Operational Check
The purpose of the operational check is to confirm that the system operates properly.

Conditions : Engine running and at normal operating temperature

CHECKING MEMORY FUNCTION
1. Set the temperature to 32 °C (90 °F).
2. Press the OFF switch.
3. Turn ignition switch OFF.
4. Turn ignition switch ON.
5. Press the AUTO switch.
6. Confirm that the set temperature remains at previous temperature.
7. Press the OFF switch.

If NG, go to trouble diagnosis procedure for HAC-96, "Memory Function Check". Memory Function Does Not Operate
If OK, continue with next check.

CHECKING BLOWER
1. Rotate the blower control dial clockwise once, blower should operate on low speed.
2. Rotate the blower control dial again, and continue checking blower speed until all speeds are checked.
3. Leave blower on maximum speed.

If NG, go to trouble diagnosis procedure for HAC-48, "Front Blower Motor Diagnosis Procedure". Blower Motor Control System
If OK, continue with next check.






CHECKING RECIRCULATION






CHECKING TEMPERATURE DECREASE
1. Rotate temperature control dial (drive or passenger) counterclockwise until 18 °C (60 °F) is displayed.
2. Check for cold air at appropriate discharge air outlets.

If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for HAC-84, "Component Function Check". Insufficient Cooling If air mix door motor appears to be malfunctioning, go to HAC-29, "Air Mix Door Motor Component Function Check". Air Mix Door Motor
If OK, continue the check.

CHECKING TEMPERATURE INCREASE
1. Rotate temperature control dial clockwise (drive or passenger) until 32 °C (90 °F) is displayed.
2. Check for hot air at appropriate discharge air outlets.

If NG, listen for sound of air mix door motor operation. If OK, go to trouble diagnosis procedure for HAC-92, "Component Function Check". Insufficient Heating If air mix door motor appears to be malfunctioning, go to HAC-29, "Air Mix Door Motor Component Function Check". Air Mix Door Motor
If OK, continue with next check.

CHECK A/C SWITCH
1. Press A/C switch when AUTO switch is ON, or in manual mode.
2. A/C switch indicator will turn ON.
- Confirm that the compressor clutch engages (sound or visual inspection).

NOTE: If current mode setting is DEF or D/F, compressor clutch will already be engaged and cannot be turned off.

If NG, go to trouble diagnosis procedure for HAC-54, "Magnet Clutch Diagnosis Procedure". Magnet Clutch Circuit
If OK, continue with next check.

CHECKING AUTO MODE
1. Press AUTO switch.
2. AUTO indicator should illuminate.
- If ambient temperature is warm, and selected temperature is cool, confirm that the compressor clutch engages (sound or visual inspection). (Discharge air and blower speed will depend on ambient, in-vehicle, and set temperatures.)

If NG, go to trouble diagnosis procedure for HAC-71, "Front Air Control Power and Ground Diagnosis Procedure", Power Supply and Ground Circuit For Controller then if necessary, trouble diagnosis procedure for HAC-54, "Magnet Clutch Diagnosis Procedure". Magnet Clutch Circuit

If all operational checks are OK (symptom cannot be duplicated), go to malfunction Simulation Tests in HAC-6, "How to Perform Trouble Diagnosis For Quick And Accurate Repair" Diagnosis and Repair Workflow and perform tests as outlined to simulate driving conditions environment. If symptom appears. Refer to HAC-83, "Symptom Matrix Chart", Symptom Chart and perform applicable trouble diagnosis procedures.