Chevrolet Trax: Front heated seat malfunction (without memory A45)
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The driver and passenger heated seats are controlled by separate heated seat switches that are located in the HVAC control. When a heated seat switch is pressed, a serial data message is sent from the HVAC control module to the seat heating control module indicating the heated seat command. In response to this message, the seat heating control module applies battery positive voltage through the element supply voltage circuit to the appropriate seat heating elements. The seat heating control module then sends a serial data message back to the HVAC control module to either illuminate or turn off the appropriate temperature indicator.
Reference Information
Schematic Reference
Heated/Cooled Seat Schematics (Encore), Heated/Cooled Seat Schematics (Trax)
Connector End View Reference
WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX
Description and Operation
Heated Seats Description and Operation
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Engine ON.
- Verify that no heated seat DTCs are set.
- If any heated seat DTC is set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle
- If no heated seat DTCs are set
- Verify the scan tool Front Seat Heating Control Module Driver Seat Heating/Venting/Cooling Mode parameter changes between Off and Back & Cushion Heat after pressing the driver heated seat switch
- If the parameter does not change
Replace the K33 HVAC Control Module.
- If the parameter changes
- Verify the scan tool Passenger Front Seat Heating/Venting/Cooling Mode Switch parameter changes between Off and Back & Cushion Heat after pressing the passenger heated seat switch
- If the parameter does not change
Replace the K33 HVAC Control Module.
- If the parameter changes
- Replace the K29 Seat Heating Control Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for K29 Seat Heating Control Module and K33 HVAC Control Module replacement, programming and setup
READ NEXT:
Front heated seat malfunction (with memory A45)
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Seat heating and cooling - Repair instructions
FRONT SEAT HEATER CONTROL MODULE REPLACEMENT
Fig. 3: Front Seat Heater Control Module
Front Seat Heater Control Module Replacement
DRIVER OR PASSENGER SEAT BACK CUSHION HEATER REPLACEMENT
Fig.
Seat heating and cooling - Description and operation
HEATED SEATS DESCRIPTION AND OPERATION
Heated Seat Components
The driver and passenger heated seats consist of the following components:
Left heated seat switch
Right heated seat switch
HVAC contr
SEE MORE:
Coolant system flushing
NOTE:
Do not use a chemical flush.
Store used coolant in the proper manner, such as in a used engine
coolant
holding tank.
Do not pour used coolant down a drain. Ethylene glycol antifreeze is
a
very toxic chemical.
Do not dispose of coolant into the sewer system or ground water. This
is
DTC B3933: Air conditioning evaporator temperature sensor
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
D
