General Information

General Information

Climatronic is a fully automatic climate control system. The temperature of the interior air supply, fresh air blower speeds and passenger compartment air distribution are regulated automatically. The system features fully digital electronic circuitry and On Board Diagnostic (OBD) capability.

In addition to fully automatic function, air distribution settings and fresh air blower speeds can be selected manually to suit individual needs.

The Climatronic control module -J255- is the heart of the system. It receives input information from the A/C control head -E87- and various electronic components (sensors and switches). This information is processed by the control module in accordance with specified values and provides corresponding output signals that control electrical components (actuators).

The system controls interior air temperature and distribution. The system continually samples and compares the selected interior air temperature with the actual air temperature measured by the system. Blower speeds, air temperature and distribution are then adjusted and regulated accordingly.

The A/C control head -E87- contains all controls and relevant displays needed to operate the Climatronic system. The system's functional status (mode selection, temperature and air distribution) is displayed in a LCD readout.

All automatic or manual function selections are input into the A/C control head via buttons located below the display.

When AUTO mode is selected, fresh air blower speed and air distribution signals are provided by the A/C control head -E87-. The fresh air blower speed is high when there is a large difference between the selected temperature and the actual interior temperature, and low when the difference is small or the same.

The interior temperature setting, operation modes, approximate outside temperature and blower speed are indicated on the A/C control head display at all times. The defrost, vent and footwell air distribution symbols only appear in the display when air distribution is selected manually (AUTO function override). During manual air distribution, the "AUTO" display remains off until such time the "AUTO" button is pressed.

The system can be switched oft completely by pressing the front passenger "decrease fan speed" button until "OFF" appears in the display.

Climate control options
- Automatic temperature and fan speed mode
- Manual temperature and fan speed mode
- Manual selection of air recirculation mode
- Manual selection of air flow to instrument panel vents
- Manual selection of air flow to footwell vents
- Manual selection of air flow to windshield defroster

On Board Diagnostic (OBD)
The Climatronic control module -J255- is controlled by an internal microprocessor with On Board Diagnostic (OBD) capability. If malfunctions, short or open circuits occur on monitored components, Diagnostic Trouble Codes (DTC) are stored in memory.

NOTE:
- Pressing the button "AUTO" overrides all manually input settings.
- In ECON operation, only the compressor is switched off. Heating and A/C operations continue to be controlled electronically.
- Manually selected settings remain stored in memory when the ignition is switched off. Only the function "Air recirculation" is erased after 20 minutes.
- Climatronic manual operation See Owner's Manual.
- A malfunction is present if all display symbols on the A/C control head -E87- flash. In this case check the Diagnostic Trouble Code (DTC) Memory first.