SRX AWD V6-3.0L (2010)
6. If all circuits test normal, test or replace the M73 blower motor.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Diagnostic Trouble
Code Tests and Associated Procedures/Verification Tests and Procedures) after completing the diagnostic procedure.
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Radio Control Assembly Replacement (See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Radio/Stereo/Service and
Repair/Radio Control Assembly Replacement)
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Control Module References (See: Testing and Inspection/Programming and Relearning) for seat memory control module replacement, setup, and
programming
Vented Seat Malfunction (With Memory A45)
Vented Seat Malfunction (With Memory A45)
Diagnostic Instructions
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Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
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Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
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Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure Instructions)
provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The driver and passenger vented seats are controlled by separate vented seat switches located in the radio/HVAC controls. Ignition voltage is supplied to
the driver and passenger seat blower motors through a 15 A fuse located in the rear fuse block. When a vented seat switch is pressed, a serial data
message is sent from the radio/HVAC controls to the HVAC control module indicating the vented seat command. The HVAC control module serves as a
gateway to transmit the message to the seat memory control module via the serial data line. In response to this message, the seat memory control module
applies a low side pulse width modulation (PWM) signal through the blower motor control circuits to the seat cushion and seat back blower motors
indicating the vented seat command. The logic in the blower motors then sets the blower speed to the switch set point. Both blower motors run drawing
cabin air around and away from occupant. The seat memory control module then sends a serial data message back to the HVAC controls module to
gateway the information back to the radio/HVAC controls to either illuminate or turn off the appropriate switch indicator.
