Output Signals

Output signals





System overview
1. CCM climate control panel
2. Fan motor
3. Air conditioning (A/C) compressor
4. Air conditioning (A/C) relay
5. Blower fan in the passenger compartment
6. Power unit
7. Data link connector (DLC)
8. Shutter motors
9. Combined instrument panel display
10. DIM
11. EFCM
12. ECM
13. Central electronic module

Output signals ECC/MCC/STD
Certain components are directly connected to the Climate control module and others are connected to other control modules in the network. The Electronic climate control (ECC) and Manual climate control (MCC) output signals differ only in that the ECC has one shutter motor more. Standard (STD) has the same signals as the Manual climate control (MCC) except for those signals controlling the compressor. The following output signals are sent from the Climate control module regardless of the type of climate control system:
Blower fan speed via the power unit with the following functions:
- Stepless fan setting from zero to maximum voltage.
- In case of short-circuit, locked blower fan motor, temperature too high or U less than 9V the power unit protects the blower fan motor by switching it off.
Recirculation and fresh air shutters opening.
Left side temperature switch control.
Right side temperature switch control.
Ventilation and floor shutter control. (On the Manual climate control(MCC)/Standard (STD) the motor also controls the defroster shutter.
Information to the combined instrument panel display via Driver information module (DIM).
Signals to VIDA via data link connector (DLC).

Output signals ECC/MCC
In addition to the common input signals the following signals are sent from the Climate control module when the system is an ECC or MCC:
The Climate control module supplies the engine control module (ECM) with the following information (via the CEM):
- If the air conditioning (A/C) compressor should operate.
- If the idling speed should be normal or increased.

Output signals ECC
The following signals are specific for the Electronic climate control (ECC) climate control system:
- Defroster shutter opening control (ECC).

Air Conditioning Compressor control (ECC/MCC)
The Climate control module requests compressor activation with an air conditioning selected signal which is sent to the engine control module (ECM). Based on this signal, the signal from the engine coolant temperature, throttle position and the signal from the evaporator temperature sensor the engine control module (ECM) determines when the compressor should work.
The advantage with allowing the engine control module (ECM) to control the Air Conditioning Compressor is that it can delay the compressor switching on slightly, if the idling speed needs to compensate for the extra load for example.