9000 CSE V6-2962cc 3.0L DOHC (B308) (1996)
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Blower Motor: Description and Operation
Ventilation Fan
Fan Impeller And Fan Motor
The fan impeller is of radial type with a guide collar on its outer edge. The fan impeller is balanced with steel clips. The fan motor is a DC motor,
whose speed can be regulated by changing the voltage across it.
The fan (pin 1) is direct fed with +54 from fuse 6 in fuse holder 22A. When the starter motor is operating, there is no voltage from +54. On the
ground side, the fan is connected to a fan control module which receives control voltage 0-5 volts from pin 20 on the ACC control module. Up to
M1990, the fan also transmits a DC feedback signal, 1-12 Volts which is proportional to fan speed.
The fan control module is also supplied with voltage from pin 17 on the ACC control module.
The ventilation fan motor is grounded via the fan control module to grounding point G2.
When the speed of the fan is manually adjusted, this is noted on the ACC control module display by the LED for "fan up" or "fan down" lighting.
When the "fan up" or "fan down" buttons are pressed, fan speed changes by 2 A/s. If the button is held depressed, fan speed changes by 3 A/s.
