Specifications

99
Data Parameters Climate Control Parameters
OUTSIDE TEMPERATURE (AMBIENT TEMPERATURE)(°C/°F)
Range: ______________________________________________________ not available
This parameter indicates outside temperature based on the signal of the ambient temperature
sensor. The ambient temperature sensor is a climate control module input, but is usually not a
dedicated climate control module sensor. It is most commonly located under the left side of the
vehicle, inside the brake-cooling duct. The information from the sensor is sent to the instrument
cluster. From there, the instrument cluster will send ambient temperature information to any
module that needs it over the K Bus data communication line. The working range of the sensor is
approximately -30 to 120°F (-34 to 49°C). The substituted default value most often used is 32°F
(0°C).
REAR COMPARTMENT FLAP MOTOR(%)
Range: ______________________________________________________ not available
This parameter indicates the IHKA command position for the rear compartment air flaps. At 0%,
the flaps should be fully closed and at 100%, fully open. These flaps are controlled through a
stepper motor which can adjust flaps in very fine increments.
RECIRCULATING FLAP MOTOR (RECIRCULATION AIR FLAPS)(%)
Range: ______________________________________________________ not available
This parameter indicates the IHKA command position for the recirculation air flaps. At 0%, the
flaps should be fully closed and at 100%, fully open. These flaps are controlled through a stepper
motor which can adjust flaps in very fine increments.
REQUESTED TEMPERATURE
SYSTEM REAR TEMP SUPPLY
Range: ___________________________________________________________ 0 to 5V
The request for air temperature stratification is made by a thumbwheel located in the front center
face vent outlet and the rear passenger console outlet (if equipped). The thumbwheel
potentiometer receives power and ground from the IHKA control module, which also monitors the
variable return voltage. In addition, the rear console outlet contains a micro-switch (on/off
request) that signals to the IHKA control module to allow air flow to the rear console.
REQUESTED TEMPERATURE(°C/°F)
REQUESTED TEMPERATURE LEFT
REQUESTED TEMPERATURE RIGHT
Range: ______________________________________________________ not available
This parameter indicates the requested temperature set at the temperature dial on the control
panel. The system will attempt to maintain the desired temperature. The range for E46 models is
59–90°F (15–32°C); the range for E39 models is 60–90°F (16–32°C).
SOLAR SENSOR(%)
Range: _________________________________________________________ 0 to 100%
SOLAR SENSOR RIGHT(V)
SOLAR SENSOR LEFT(V)
Range: ______________________________________________________ not available
Interior temperature is calculated using a solar sensor located in the right side defrost outlet. It is
used to control blower setting and air distribution to the center vent. The climate control system
uses the solar sensor input to modify the base input from the inside temperature sensor to more
accurately control the inside temperature.
SYSTEM (REFRIGERANT) PRESSURE SENSOR (V)
Range: ___________________________________________________________ 0 to 5V
This sensor is used to read the refrigerant pressure in the system. The IHKA module supplies the
power and ground path and monitors the variable voltage signal from the system pressure