Input Signals

Input signals





System overview
1. CCM climate control panel
2. Vehicle speed sensor (VSS)
3. Data link connector (DLC)
4. Blower fan in the passenger compartment
5. Power unit
6. ECM
7. ABS
8. Central electronic module
9. Shutter motors
10. Power supply relay
11. Engine coolant temperature (ECT) sensor
12. Outside temperature sensor (ECC/MCC)
13. Temperature sensor, evaporator (ECC/MCC)
14. Linear pressure sensor (ECC/MCC)
15. Passenger compartment temperature sensor (ECC)
16. Windshield wiper sensor (ECC)
17. SWM (ECC)
18. SRM (ECC)
19. UEM (ECC)
20. Sun sensor (ECC)
21. Drivers door module (DDM)/Passenger door module (PDM) (ECC)

Input 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 following signals are sent to the Climate control module regardless of the type of climate control system:
- Selected fan speed, air distribution, temperature and recirculation position from the climate control panel.
- The vehicle speed signal from the ABS is used for speed compensation. The signal travels via the CEM.
- Correction signal from the stepper motors when steps missing. The information updates the Climate control module about the motor position. When there is a fault in the stepper motor it is taken out of function.
- Diagnostic signal about the blower fan power consumption from the power unit. When there is a fault in the fan the Climate control module switches it off.
- Signals from VIDA via data link connector (DLC).

Input signals ECC/MCC
In addition to the common input signals the following signals are sent to the Climate control module when the system is an ECC or MCC:
- Air conditioning (A/C) selected from climate control panel.
- The outside temperature comes either from the passenger door module (PDM) or drivers door module (DDM) depending on left or right hand drive because the temperature sensor is always on the right door mirror.
- Fan control occurs in three stages, depending on the signal from the linear pressure sensor.
- The engine control module (ECM) supplies the Climate control module with the following information (via the CEM):
- Climate control system pressure from the linear pressure sensor.
- Engine temperature from the engine coolant temperature (ECT) sensor.
- The climate control system intake air temperature from the temperature sensor downstream of the evaporator. The signal is used to control the air conditioning (A/C) compressor. When there is a risk of freezing the compressor is switched off.

Input signals ECC
The following signals are specific for the Electronic climate control (ECC) climate control system:
- Sun roof open or closed from the Sun roof module (SRM). The sun roof position gives a signal for limiting the climate control. If the sun roof is opened on a warm summers day the blower fan is prevented from increasing speed to maximum speed to compensate for the temperature change.
- The passenger compartment air temperature from the passenger compartment temperature sensor installed in the climate control panel.
- The suns intensity from the sun sensor so that the Climate control module can adjust the air in the passenger compartment to the current sun conditions.
- The steering wheel module supplies the Climate control module with the windshield wipers status to guide the air distribution to defrost to reduce the risk of misting on the windows in rain.