DeVille DHS V8-4.6L VIN Y (2000)
Seat Heater: Customer Interest
DHS/DTS & DeVille Rear Seat Diagnostic Procedure
1.
Remove the rear seat cushion assembly (1) from the vehicle. Refer to Seat Cushion Replacement Rear in the Seats sub-section of the Service
Manual.
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.
2.
At the rear seat cushion blue, 8-way connector C320 (2), measure the thermistor resistance.
^
For the LH rear seat cushion, measure between cavities C and D. Does the resistance measure between 280 ohms and 300 K ohms?
^
For the RH rear seat cushion, measure between cavities G and H. Does the resistance measure between 280 ohms and 300 K ohms?
^
If yes, go to Step 3.
^
If no, install a rear seat cushion (center) heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
3.
At the rear seat cushion blue, 8-way connector C320 (2), measure the element resistance.
^
For the LH rear seat cushion, measure between cavities A and B. Does the resistance measure less than 10 ohms?
^
For the RH rear seat cushion, measure between cavities E and F. Does the resistance measure less than 10 ohms?
^
If yes, go to Step 8.
^
If no, for DeVille models ONLY, install a rear seat cushion heat element. Refer to the Service Heat Element Installation Procedure in this
bulletin.
^
If no, for DHS & DTS models ONLY, go to Step 4 in order to determine which of the three rear seat cushion heat elements has a resistance
value NOT within the specified range.
4.
For DHS & DTS models ONLY: Remove the trim cover from the rear seat cushion. Refer to Seat Cushion Cover Replacement-Rear in the Seats
sub-section of the Service Manual.
5.
For DHS & DTS models ONLY: At the LH/RH rear seat cushion, disconnect the green 2-way connectors between the seat cushion center heat
element and the seat cushion thigh heat elements.
