System Function, Overview

Climatronic System Function, Overview

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

Front passenger zone, 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

Rear passenger zone, climate control options
- Automatic temperature and fan speed mode
- Manual selection of temperature and fan speed

Climatronic, function
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 two separate LCD readouts. The left display is for the front passenger zone, the right display is for the rear passenger zone.

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

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 off completely by pressing the front passenger "decrease fan speed" button until "OFF" appears in the display.

Vehicles 09.98 >

A/C Control Head -E87-, Climatronic Control Module -J255- and Instrument Panel Interior Temperature Sensor -G56- with Interior Temperature Sensor Fan -V42- are integrated into a non serviceable unit.