S 500 (220.175) V8-5.0L (113.960) (2004)
Blower Motor: Description and Operation
Rear
Purpose
The blower sucks air out of the vehicle passenger compartment into the rear A/C housing.
The rear air conditioning operates exclusively in the recirculated air mode.
Function
The rear A/C pushbutton control module transfers a control voltage of 0 - 6V to the rear blower regulator. This then controls the operating voltage for the
rear blower (0-12 V) depending on the control voltage present. This provides for control of the blower speed from 0 - 100 %.
The blower control (operating voltage) is affected by the following factors:
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Blower speed (AUT0/manual).
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Control functions (ON/OUT, EC, REST, air distribution)
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Circuit 15 (blower ON), starter running (blower OFF)