Seat Temperature Sensor: Testing and Inspection

For complete circuit diagrams, refer to the WIRING.

1. Obtain a DRB III(R) scan tool, if a DRB scan tool is not available a accurate voltmeter will also work.
2. If using a DRB III(R), navigate through the following path on the DRB display screen, Body/Memory Seat Module/Sensor Display. Under Sensor Display you will find RT Seat Temp Volts - and LT Seat Temp Volts, compare the voltage reading with the table shown. If the voltage is not within specification, replace the heated seat element.
3. If using a voltmeter, backprobe the sensor return signal circuit at the module and compare the voltage reading with the table shown. Refer to heated seat element diagnosis and testing for additional instructions. If the voltage is not within specification, replace the heated seat element.





- In reference to the table above, the LO/HI Set Point is the point at which the voltage will stabilize. As the temperature of the seat cushion rises the voltage on the return signal circuit or seat temp volts should also steadily rise until the set point is reached. Once the heat level or set point is reached, the memory heated seat/mirror module will toggle the heating elements ON/OFF to maintain the set point or temperature. The cold seat specification is measured with the vehicle stabilized in a 65°F shop or garage.

Keep in mind that the seat temp voltage or return signal voltage is monitored on the PACE DATA BUS circuit and should set a diagnostic trouble code if shorted hi/b or open. Always check for any stored trouble codes in the memory heated seat/mirror module before attempting any service or diagnostics of the system. Also, never erase stored trouble codes until the problem has been identified, this way you can keep a record of your progress.