CHECKING AUTO MODE
- Press AUTO switch.
- Display should indicate AUTO. 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 " POWER SUPPLY AND GROUND CIRCUIT FOR FRONT AIR CONTROL ", then if necessary, trouble diagnosis procedure for " MAGNET CLUTCH CIRCUIT ".
If all operational checks are OK (symptom cannot be duplicated), go to malfunction simulation tests in " HOW TO PERFORM TROUBLE DIAGNOSIS FOR QUICK AND ACCURATE REPAIR " and perform tests as outlined to simulate driving conditions environment. If symptom appears, refer to " HOW TO PERFORM TROUBLE DIAGNOSIS FOR QUICK AND ACCURATE REPAIR ", " SYMPTOM TABLE " and perform applicable trouble diagnosis procedures.
- Turn the rear blower control dial counterclockwise to switch position "1". Fan should operate on low speed.
- Turn the rear blower control dial clockwise to switch positions "2", "3", and "4" until all speeds are checked.
- Leave fan on maximum speed.
If NG, go to trouble diagnosis procedure for " REAR BLOWER MOTOR CIRCUIT ".
If OK, continue the check.
- Rotate temperature and mode dial fully counterclockwise.
- 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 " INSUFFICIENT COOLING ". If air mix door motor appears to be malfunctioning, go to " DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (REAR) ".
If OK, continue the check.
- Rotate temperature and mode dial clockwise.
- 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 " INSUFFICIENT HEATING ". If air mix door motor appears to be malfunctioning, go to " DIAGNOSTIC PROCEDURE FOR AIR MIX DOOR MOTOR (REAR) ".
If OK, continue the check.