DeVille DTS V8-4.6L VIN 9 (2002)
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If no, install a rear seat cushion LH thigh heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
7.
For DHS & DTS models ONLY: Measure the RH seat cushion thigh heat element resistance between cavities A and B at the green 2-way
connector.
Does the resistance measure less than 30 ohms?
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If yes, install a rear seat cushion (center) heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
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If no, install a rear seat cushion RH thigh heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
8.
Remove the rear seat back assembly from the vehicle. Refer to Seat Back Replacement-Rear in the Seats sub-section of the Service Manual.
9.
At the rear seat back LH (1) or RH (2) heated seat module, disconnect the blue, 8-way connector C2.
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.
10.
Measure the rear seat back thermistor resistance between cavities E and F. Does the resistance measure between 280 ohms and 300 K ohms?
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If yes, go to Step 11.
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If no, install a rear seat back heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
11.
Measure the rear seat back element resistance between cavities G and H. Does the resistance measure less than 10 ohms?
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If yes, the resistance values of the rear seat heat elements are within the specified range. To find the cause of the inoperative/cold rear heated
seat, perform the standard diagnostic procedures in the Service Manual.
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If no, install a rear seat back heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
Service Heat Element Installation Procedure
If a sublet trim repair facility is used, please provide a copy of this bulletin to the repair shop.
Important:
Before installing the service heat element to the seat trim cover, verify that the seat assembly heat function operates properly with the service heat
element connected.
Important:
DO NOT attempt to remove the factory heat elements from the seat trim cover. The service heat element is to be installed between the factory heat
element and the seat trim cover.
