Seat Temperature Sensor: Testing and Inspection

The power seat wire harness connectors for the heated seat sensors are located under the seat, near the rear edge of the seat cushion frame.
1. Disconnect and isolate the battery negative cable. Disconnect the 4-way (heated seat cushion element and sensor) pigtail wire connector for the inoperative seat from the power seat wire harness connector.
2. Using an ohmmeter, check the resistance between the driver or passenger heat sense input circuit cavity and the sensor feed circuit cavity of the 4-way (heated seat cushion element and sensor) pigtail wire connector. The sensor resistance reading should be between 1 kilo ohm and 200 kilo ohms. If OK, refer to Step 3. If not OK, replace the faulty seat cushion trim cover.
3. Disconnect the power seat wire harness connector for the heated seat module (also known as the Seat Heat Interface Module or SHIM) from the SHIM connector receptacle. Test the driver or passenger heat sense input circuit between the power seat wire harness connector for the seat cushion with the inoperative sensor and the connector for the SHIM for a shorted or open circuit. If OK, go to Step 4. If not OK, repair the shorted or open heat sense input circuit of the power seat wire harness as required.
4. Test the sensor feed circuit between the power seat wire harness connector for the seat cushion with the inoperative sensor and the connector for the SHIM for a shorted or open circuit. If OK, refer to the heated seat module diagnosis and testing procedure in Electronic Control Modules. If not OK, repair the shorted or open sensor feed circuit of the power seat wire harness as required.