The electronic climate control (ECC) modules (front and
rear) serves as an interface between the passenger and the blower motor. System
voltage is supplied to the ECC modules by the following sources:
| • | Continuous battery voltage source: |
| - | RADIO fuse (front module) |
| • | Interrupted battery voltage source: |
| - | HVAC I fuse (front module) |
| - | IGN 3 fuse (rear module) |
The ground path is provided to grounds G200/G410.
The ECC modules determines the appropriate blower motor speed and sends
a pulse width modulated (PWM) signal to the blower motor. The ECC module may
produce the blower motor speed signal in two modes of operation:
In the manual operation mode 13 speed settings are available
and, once selected, the fan speed remains constant until a new speed is selected.
In the automatic operation mode the ECC module will determine what blower
speed is necessary in order to maintain customer selected temperature.
