DeVille DHS V8-4.6L VIN Y (2000)
Seat Heater: All Technical Service Bulletins
DeVille Front Seat Diagnostic Procedure
1.
Adjust the front seat assembly to the maximum up and rearward position in order to access the seat cushion fasteners.
2.
Remove the fasteners (1) retaining the seat cushion to the heat adjuster.
3.
Disconnect the heated seat module harness blue, 8-way connector C2 (2).
4.
Measure the front seat back element resistance between cavities G and H. Does the resistance measure less than 10 ohms?
^
If yes, go to Step 5.
^
If no, install a front seat back heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
Important:
If the resistance is measured with the seat still warm, the resistance may vary outside of the specified range since the thermistor resistance varies with
temperature.
5.
Measure the front seat back thermistor resistance between cavities E and F. Does the resistance measure between 280 ohms and 300 K ohms?
^
If yes, go to Step 6.
^
If no, install a front seat back heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
6.
Measure the front seat cushion thermistor resistance between cavities C and D. Does the resistance measure between 280 ohms and 300 K ohms?
^
If yes. go to Step 7.
^
If no, install a front seat cushion heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
7.
Measure the front seat cushion element resistance between cavities A and B. Does the resistance measure less than 10 ohms?
^
If yes, the resistance values of the front seat heat elements are within the specified range. To find the cause of the inoperative/cold heated seat,
perform the standard diagnostic procedures in the Service Manual.
^
If no, install a front seat cushion heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
