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Front Heated Seat Malfunction

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

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Driver Heated Seat Element Control Terminal 3 X2

B242A 02

B2425 0D

B242A 01

B2425 0B, B2425 0E

Driver Heated Seat Element Control Terminal 1 X2

B242A 02

B2425 0D

B242A 01

B2425 0B, B2425 0E

Driver Heated Seat Cushion Temperature Sensor Signal

B1925 02

B1925 05

B1925 05

B2345 13

Driver Heated Seat Cushion Temperature Sensor Low Reference

--

B1925 05

--

B2345 13

Passenger Heated Seat Element Control Terminal 5 X2

B242A 02

B2430 0D

B242A 01

B2430 0B, B2430 0E

Passenger Heated Seat Element Control Terminal 2 X2

B242A 02

B2430 0D

B242A 01

B2430 0B, B2430 0E

Passenger Heated Seat Cushion Temperature Sensor Signal

B2170 02

B2170 05

B2170 05

B2345 13

Passenger Heated Seat Cushion Temperature Sensor Low Reference

--

B2170 05

--

B2345 13

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 to the HVAC control module indicating the heated seat command. The HVAC control module serves as a gateway to transmit the message to the heated seat control module via the serial data line. 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 gateway the information to the HVAC control to either illuminate or turn off the appropriate temperature indicator.

Reference Information

Schematic Reference

Heated/Cooled Seat Schematics

Connector End View Reference

Component Connector End Views

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
  1. Engine ON, observe the scan tool Driver Seat Heating/Venting/Cooling Mode parameter while pressing the driver HEATED seat switch. The reading should change between Off and Back & Cushion Heat.
    2. ⇒If not the specified value, replace the A26 HVAC control.
  2. Observe the scan tool Passenger Seat Heating/Venting/Cooling Mode parameter while pressing the passenger HEATED seat switch. The reading should change between Off and Back & Cushion Heat.
    3. ⇒If not the specified value, replace the A26 HVAC control.
  3. If all scan tool parameter readings are normal, there are no DTCs set, and the driver and/or passenger heated seat is inoperative, replace the K29 seat heating control module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Heater and Air Conditioning Control Replacement
    • Control Module References for seat heating control module replacement, setup, and programming
   


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