Heating and Air Conditioning

Component specification, climate control module (CCM)

Evaporator temperature sensor 7/41

General
The evaporator temperature sensor sends the current evaporator temperature to the engine control module (ECM) via the climate control module (CCM). The engine control module (ECM) then determines whether the compressor should be started.





Type

Temperature-dependent, NTC resistor (negative temperature coefficient).

Characteristic

Resistance between terminals #29 and #38 on the breakout box should be 3.44 kohms at +20 °C. Resistance decreases as temperature increases.

Other information
Diagnostic trouble code B1B7115 is generated upon short circuit to supply voltage or open circuit.
Diagnostic trouble code B1B7111 is generated upon short circuit to ground.

Terminal






Check
Prerequisites (unless otherwise specified):
- Breakout box connected.
- Sensor connected.
- Ignition switch position 0.

Check 1
Evaporator temperature sensor:
Measure resistance between terminals #17 and #16 on the breakout box. The value should follow the information below:
R = 3.44 kohms at 20 °C.
R = 1.47 kohms at 40 °C.
R = 336 ohms at 80 °C.
R = 187 ohms at 100 °C.

Passenger compartment temperature sensor (integrated in the Climate control module (CCM))

General
The passenger compartment temperature sensor continually provides the climate control module (CCM) information on passenger compartment temperature. To prevent the sensor from being affected by surround electronics, a fan is used to blow air from the passenger compartment onto the sensor.

Type
Passenger compartment temperature sensor: Temperature-dependent, NTC resistance (negative temperature coefficient).
Passenger compartment sensor fan: Electromagnetic motor.

Characteristic
passenger compartment temperature sensor: Resistance between terminal a and f in the figure below should be 12 kohms at +20 °C. Resistance decreases as temperature increases.
Passenger compartment sensor fan: The fan is powered by the climate control module (CCM).





Other information
Passenger compartment temperature sensor:
Diagnostic trouble code B1A6111 is generated upon short circuit to ground.
Diagnostic trouble code B1A6115 is generated upon short circuit to supply voltage or open circuit.
Passenger compartment sensor fan:
Diagnostic trouble code B105A11 is generated upon short circuit to ground.
Diagnostic trouble code B105A15 is generated upon short circuit or open circuit.
Diagnostic trouble code B105A71 is generated upon mechanical fault if something fastens in the rotor.

Terminal






Check
Prerequisites (unless otherwise specified):
- The fan/passenger compartment temperature sensor unit must be removed from the Climate control module (CCM) in order to gain access to take readings from the terminals.

Check 1
Passenger compartment temperature sensor:
Measure the resistance between terminals a and f. The value should follow the information below:
R = 28 kohms at 0 °C.
R = 18 kohms at 10 °C.
R = 12 kohms at 20 °C.
R = 10 kohms at 25 °C.
R = 8.2 kohms at 30 °C.
R = 5.7 kohms at 40 °C.

Air quality sensor 7/159

General





Type
Air quality sensor:

Characteristic
Air quality sensor:

Other information
Air quality sensor:
Diagnostic trouble code B102E09 is generated upon component fault.
Diagnostic trouble code B102E11 is generated upon short circuit to ground.
Diagnostic trouble code B102E12 is generated upon short circuit to supply voltage.

Terminal






Ventilation fan 6/28

General





Type
Power-supplying motor: Linear output amplifier.
Fan motor: Electromagnetic motor.

Characteristic
The voltage between terminal #1 and #12 on the breakout box varies linearly between 0 and 10 V, depending on the speed of the fan motor.

Other information
The fan motor is supplied by a PWM signal from the climate control module (CCM) via the fan's control module. The control module ensures that the fan motor receives the correct voltage in reference to battery voltage and that the fan thereby obtains the desired speed.

Diagnostic trouble code B10B911 is generated upon short circuit to ground.
Diagnostic trouble code B10B912 is generated upon short circuit to supply voltage.
DTC B10B913 is generated upon open circuit.

Terminal






Check
Prerequisites (unless otherwise specified):
- Fan connected.
- Ignition switch position II.

Check 1
Check that the fan is operational by setting fan speed to 100% and listening. Sounds from the fan should be clearly audible.