DESCRIPTION
| WARNING | To avoid injury from accidental air bag deployment, read and carefully follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM procedures in AIR BAG SYSTEM SAFETY article in GENERAL SERVICING. |
Automatic Temperature Control (ATC) system provides for manual or automatic control of climate zone in passenger compartment. When automatic mode is selected, ATC system controls blower motor speed, temperature, and mode (airflow). ATC system has self-diagnostic capabilities and will store Diagnostic Trouble Codes (DTCs) in Body Control Module (BCM). Powertrain Control Module (PCM) may store ATC system related DTCs. Only BCM DTCs can be retrieved using ATC control panel. All DTCs can be retrieved Chrysler's Diagnostic Readout Box (DRBIII®), or generic scan tool. See SELF-DIAGNOSTICS .
Automatic Operation
Automatic Temperature Control (ATC) system operation is activated by pressing AUTO button (ATC system ON button) and selecting temperature. (Схема №1) Temperature control is automatic when selected temperature is 65-85°F (18-29°C). Automatic temperature control is canceled when full heat (90°F or 32°C) or full cool (60°F or 16°C) is selected, OFF button is pressed, or blower motor speed and mode are manually selected.
ATC system maintains selected temperature by controlling blower motor speed and mode setting. Temperature can be reset within specified range without affecting ATC system operation. Function display and a Light Emitting Diode (LED) in rocker-type push button switches will be illuminated to indicate active ATC function, mode and blower motor speed. (Схема №1)
Manual Operation
ATC system will be placed in manual operation when A/C compressor on button, blower motor speed and a mode button are manually selected. When full heat (HI) or full cool (LO) is selected, automatic temperature control is disabled for manual A/C-heater operation.
A/C pressure sensor signal voltage is monitored with engine running and A/C clutch relay energized. DTC will set in Powertrain Control Module (PCM) memory when PCM senses A/C pressure sensor voltage is more than 4.9 volts. Possible causes for DTC to set are: defective A/C pressure sensor, defective PCM, defective connectors or defective wiring.
A/C pressure sensor signal voltage is monitored with engine running and A/C clutch relay energized. DTC will set in Powertrain Control Module (PCM) memory when PCM senses A/C pressure sensor voltage is less than .6 volts for about 3 seconds or longer. Possible causes for DTC to set are: defective A/C pressure sensor, defective PCM, defective connectors or defective wiring.