DESCRIPTION
Automatic A/C-heater system consists of standard A/C-heater system and electronically controlled components. The auto amplifier controls air mix door, fan speed, outlet door, intake door and A/C compressor clutch. Auto amplifier, built into Body Control Module (BCM), includes self-diagnostic system. Coolant temperature is monitored by thermal transmitter, located on left rear of engine.
OPERATION
Automatic A/C-heater system automatically selects optimum airflow, outlet air temperature and outlet vent to maintain vehicle interior temperature at desired setting.
Actuator Operation Check
- With system in SELF-DIAGNOSIS STEP 3, press temperature control switch UP (hot) arrow to enter «SELF-DIAGNOSIS STEP 4»(ref-35510-S07405871472001010900000) . Fluorescent display will display "41". Each time defrost button is pressed, display will advance one number, up to "46". After "46", numbers will return to "41".
- As numbers advance, A/C auto amplifier will command selected actuator operation and change air intake and outlet routes. A visual and physical inspection must be made to ensure doors are switching properly. To determine proper door positions for each code, see «SELF-DIAGNOSIS STEP 4 ACTUATOR CODES»(ref-35510-S41055596562001010900000) table.
| Actuator | Door Position/Component Operation | |
|---|---|---|
| Code 41 | ||
| Mode Door | (1) Vent (100% Face) | |
| Intake Door | Recirculated Air | |
| Air Mix Door | Full Cold | |
| Blower Motor | (2) Low (4-5 Volts) | |
| Compressor | On | |
| Code 42 | ||
| Mode Door | (1) Bi-Level (60% Face/40% Foot) | |
| Intake Door | Recirculated Air | |
| Air Mix Door | Full Cold | |
| Blower Motor | (2) Medium-High (9-11 Volts) | |
| Compressor | On | |
| Code 43 | ||
| Mode Door | (1) Bi-Level (60% Face/40% Foot) | |
| Intake Door | 20% Fresh Air | |
| Air Mix Door | Full Hot | |
| Blower Motor | (2) Medium-Low (7-9 Volts) | |
| Compressor | Off | |
| Code 44 | ||
| Mode Door | (1) Foot (78% Foot/22% Defrost) | |
| Intake Door | Fresh Air | |
| Air Mix Door | Full Hot | |
| Blower Motor | (2) Medium-Low (7-9 Volts) | |
| Compressor | Off | |
| Code 45 | ||
| Mode Door | (1) Foot/Defrost (60% Foot/40% Defrost) | |
| Intake Door | Fresh Air | |
| Air Mix Door | Full Hot | |
| Blower Motor | (2) Medium-Low (7-9 Volts) | |
| Compressor | On | |
| Code 46 | ||
| Mode Door | (1) Defrost (100% Defrost) | |
| Intake Door | Fresh Air | |
| Air Mix Door | Full Hot | |
| Blower Motor | (2) High (10-12 Volts) | |
| Compressor | On | |
| (1) Air flow outlet & percentage of air flow distribution. (2) Voltage applied to blower motor for desired speed. | ||
| (1) | Air flow outlet & percentage of air flow distribution. |
| (2) | Voltage applied to blower motor for desired speed. |
SELF-DIAGNOSIS STEP 4 ACTUATOR CODES