SRX AWD V6-3.0L (2010)
3. If all scan tool parameter readings test normal, there are no DTCs set, and the left and/or right rear heated seat is inoperative, replace the K29R
rear seat heating control module.
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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Heater and Air Conditioning and Radio Control Module Replacement (See: Accessories and Optional Equipment/Service and Repair)
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Control Module References (See: Testing and Inspection/Programming and Relearning) for rear seat heating control module and body control
module replacement, setup, and programming
Vented Seat Malfunction (Without Memory A45)
Vented Seat Malfunction (Without 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 heating control module via the serial data line. In response to this message, the seat heating 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 heating control module then sends a serial data message back to the HVAC control module to
gateway the information back to the radio/HVAC controls to either illuminate or turn off the appropriate switch indicator.
