Mechanics

HEATED DRIVER'S SEAT DOES NOT WORK?

2001 Cadillac Deville • 74,300 miles

2001 Cadillac Deville the heated driver's seat does not work for the butt or back. I checked the fuse and it is good. When I push the button to turn on heat or change setting I can hear clicking coming from underneath the seat. What is the problem and how do I fix it?

I checked passenger seat and it works fine, both butt and back. I hear clicking coming from underneath the driver seat.


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Staylor69
December 12, 2011.




Check to see if the fuses are good. Check to see if there is power to and from the switch.
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2001 was a common year for elements to go bad, in fact there was a service bulletin published for it. Since it comes on, and immediately shuts down, it is an indication that there is either too much current flow, or too much resistance to current flow. You would need to check resistance of each individual element. Not necessarily all are bad, it may just be one. If it is a base deville, it has one element in each cushion(bottom/back). If it is DHS/DTS it has four(back/bottom/thigh(x2)). Here is the bulletin.

#01-08-50-001C: Front/Rear Heated Seat Inoperative/Cold (Install Seat Heat Element) - (Jul 1, 2011)

Subject: Front/Rear Heated Seat Inoperative/Cold (Install Seat Heat Element)

Models: 2000 2003 Cadillac DeVille (All Models) with RPO KA1

This bulletin is being revised to update the model year information. Please discard Corporate Bulletin Number?01-08-50-001B (Section 08 Body and Accessories)

Condition

Some customers may comment that the front/rear seat assembly heat function is not operating properly. The front/rear seat back and seat cushion remain cold when either the HEAT/OFF switch or the BACK ONLY switch is activated.

Cause

This condition may be due to a non-functioning heat element in the front/rear heated seat back/cushion trim cover.

The heated seat system consists of four heated seats, two in the front and two in the rear. On the DHS and DTS models, each heated seat consists of four heat elements, one in the seat back and three in the seat cushion. On the DeVille model, each heated seat consists of two heat elements, one in the seat back and one in the seat cushion.

DHS & DTS Seat Heat Element Locations

Location #

Part Number

Description

1

25715920

Front Seat Back Cushion Heat Element

2

25715921

Front Seat Cushion Heat Element

3

25715924

Front Seat Cushion (LH Thigh) Heat Element

4

25715925

Front Seat Cushion (RH Thigh) Heat Element

5

25715926

Rear Seat Back Cushion Heat Element

6

25715927

Rear Seat Cushion Heat Element

7

25715928

Rear Seat Cushion (LH Thigh) Heat Element

8

25715929

Rear Seat Cushion (RH Thigh) Heat Element

DeVille Seat Heat Element Locations

Location #

Part Number

Description

1

25740850

Front Seat Back Cushion Heat Element

2

25740851

Front Seat Cushion Heat Element

3

25740853

RH Rear Seat Back Cushion Heat Element

4

25740852

LH Rear Seat Back Cushion Heat Element

5

25740854

LH Rear Seat Cushion Heat Element

6

25740855

RH Rear Seat Cushion Heat Element

Correction

1.

Determine which heat element is not functioning properly by measuring the resistance values of the factory heat elements. Refer to the appropriate diagnostic procedure in this bulletin.

2.

If the resistance values of a factory heat element are NOT within the specified range, install a service heat element between the non-functioning factory heat element and the seat trim cover. Refer to the Service Heat Element Installation Procedure in this bulletin.

DHS/DTS 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 seat 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 (center) 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, go to Step 8 in order to determine which of the three seat cushion heat elements has a resistance value NOT within the specified range.

8.

Remove the front seat assembly from the vehicle. Refer to Seat Replacement in the Seats sub-section of the Service Manual.

9.

Remove the trim cover from the front seat cushion. Refer to Seat Cushion Cover Replacement Front in the Seats sub-section of the Service Manual.

10.

Disconnect the green 2 way connectors between the seat cushion center heat element and the seat cushion thigh heat elements.

11.

Measure the LH seat cushion thigh heat element resistance between cavities A and B at the green 2 way connector. Does the resistance measure less than 23?Ohms?

If yes, go to Step 12.

If no, install a front seat cushion LH thigh heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.

12.

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 23?Ohms?

If yes, install a front seat cushion (center) heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.

If no, install a front seat cushion RH thigh heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.

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 seat 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.

Factoryjack
Dec 13, 2011.

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