How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Jerry Newton Your Own Question

Jerry Newton
Jerry Newton, Cadillac Technician
Category: Cadillac
Satisfied Customers: 3201
Experience:  ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Type Your Cadillac Question Here...
Jerry Newton is online now
A new question is answered every 9 seconds

My 2002 cadillac deville drivers side seat heater just quit.

Customer Question

My 2002 cadillac deville drivers side seat heater just quit. Sometimes it feels like it is working but puts out very little warmth. The passenger side heater and the back seat heaters all work fine. What is the procedure to fix this problem. I.E. Is there a fuse or reset that I should check out and or something that is common as a problem with these drivers side seat heaters?

Please respond.

Thanks--Dennis R.
Submitted: 4 years ago.
Category: Cadillac
Expert:  Jerry Newton replied 4 years ago.
This is almost always due to a faulty seat heater grid in the seat cover, and it's almost always the seat cushion grid, not the seat back grid. The procedure to repair involves removing the seat cover and installing a new heater grid. Not a terrible job, depending on how apt you are with mechanical repairs. If you'd like, I can copy/paste the repair procedure and part number for the redesigned heater grids.
Jerry Newton, Cadillac Technician
Category: Cadillac
Satisfied Customers: 3201
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
Jerry Newton and 4 other Cadillac Specialists are ready to help you
Customer: replied 4 years ago.

OK--Thats cool--what part number and procedure to replace the electric coil? BTW- I checked the fuses and all connections under the seat. The car has 96,000 miles on it and te rest of the seats all heat fine.

 

Please reply with the above requested information. Thanks and you should have $13 from my paypal account.

 

Dennis R.

Expert:  Jerry Newton replied 4 years ago.
This is a long bulletin. Hang tight for a couple of minutes, and I'll post it up here.
Expert:  Jerry Newton replied 4 years ago.
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


Object Number: 850401  Size: MF
Click here for detailed picture of above image.

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


Object Number: 850402  Size: MF
Click here for detailed picture of above image.

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. Object Number: 824513  Size: MH
    Click here for detailed picture of above image.
  3. Remove the fasteners (1) retaining the seat cushion to the seat adjuster.
  4. Disconnect the heated seat module harness blue, 8-way connector C2 (2).
  5. Measure the front seat back element resistance between cavities G and H. Does the resistance measure less than 10 ohms?
  6. 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.

  7. Measure the front seat back thermistor resistance between cavities E and F. Does the resistance measure between 280 ohms and 300 K ohms?
  8. 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.
  9. Measure the front seat cushion thermistor resistance between cavities C and D. Does the resistance measure between 280 ohms and 300 K ohms?
  10. 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.
  11. Measure the front seat cushion element resistance between cavities A and B. Does the resistance measure less than 10 ohms?
  12. 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.
  13. Remove the front seat assembly from the vehicle. Refer to Seat Replacement in the Seats sub-section of the Service Manual.
  14. 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.
  15. Disconnect the green 2-way connectors between the seat cushion center heat element and the seat cushion thigh heat elements.
  16. 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?
  17. 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.
  18. 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?
  19. 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. Object Number: 824513  Size: MH
    Click here for detailed picture of above image.
  3. Remove the fasteners (1) retaining the seat cushion to the seat adjuster.
  4. Disconnect the heated seat module harness blue, 8-way connector C2 (2).
  5. Measure the front seat back element resistance between cavities G and H. Does the resistance measure less than 10 ohms?
  6. 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.

  7. Measure the front seat back thermistor resistance between cavities E and F. Does the resistance measure between 280 ohms and 300 K ohms?
  8. 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.
  9. Measure the front seat cushion thermistor resistance between cavities C and D. Does the resistance measure between 280 ohms and 300 K ohms?
  10. 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.
  11. Measure the front seat cushion element resistance between cavities A and B. Does the resistance measure less than 10 ohms?
  12. 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.

DHS/DTS & DeVille Rear Seat Diagnostic Procedure


    Object Number: 825284  Size: MF
    Click here for detailed picture of above image.
  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.
  2. 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.

  3. At the rear seat cushion blue, 8-way connector C320 (2), measure the thermistor resistance.
  4. 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.
  5. At the rear seat cushion blue, 8-way connector C320 (2), measure the element resistance.
  6. 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.
  7. 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.
  8. 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.
  9. For DHS & DTS models ONLY: 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 30 ohms?
  10. If yes, go to Step 7.
    If no, install a rear seat cushion LH thigh heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
  11. 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?
  12. If yes, install a rear seat cushion (center) heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
    If no, install a rear seat cushion RH thigh heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
  13. Remove the rear seat back assembly from the vehicle. Refer to Seat Back Replacement-Rear in the Seats sub-section of the Service Manual.

  14. Object Number: 825287  Size: MF
    Click here for detailed picture of above image.
  15. At the rear seat back LH (1) or RH (2) heated seat module, disconnect the blue, 8-way connector C2.
  16. 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.

  17. Measure the rear seat back thermistor resistance between cavities E and F. Does the resistance measure between 280 ohms and 300 K ohms?
  18. If yes, go to Step 11.
    If no, install a rear seat back heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.
  19. Measure the rear seat back element resistance between cavities G and H. Does the resistance measure less than 10 ohms?
  20. If yes, the resistance values of the rear 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 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 resistance values are within the correct range. Refer to the following table.

Model

Range

Description

ALL

Less than 10 ohms

Seat Back Elements

DeVille

(Base)

Less than 10 ohms

Seat Cushion Elements

DHS & DTS

Less than 10 ohms

With Seat Cushion, LH & RH Thigh Elements Connected

DHS & DTS

Less than 30 ohms

Seat Cushion Thigh Elements

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.

  1. Remove the trim cover with the non-functioning heat element. Refer to the appropriate seat trim cover removal procedure in the Seats sub-section of the Service Manual.
  2. Place the seat trim cover on a clean flat surface with the inside facing out.
  3. DHS/DTS and DeVille F/Seat (R/Seat Similar)


    Object Number: 853640  Size: MF
    Click here for detailed picture of above image.
    (1)DHS/DTS F/Seat Back Trim Cover -- Inside Out
    (2)DHS/DTS F/Seat Cushion Trim Cover -- Inside Out
    (3)Cut-lines
    (4)Seat Cushion Wiring Harness Cut Locations
    (5)Seat Back Wiring Harness Cut Locations
    (6)DeVille F/Seat Cushion Trim Cover -- Inside Out
    (7)DeVille F/Seat Back Trim Cover -- Inside Out
  4. Use a marker to draw in the cut-lines (3) on the non-functioning factory heat element. Refer to the appropriate illustration.
  5. Remove the wiring harness from the non-functioning factory heat element.
  6. 4.1. At locations (4) or (5), pull back the tape covering the harness wires.
    4.2. Use a pair of diagonal side cutters to cut the harness wires as close to the factory heat element material as possible.

    DHS/DTS and DeVille F/Seat Back


    Object Number: 855792  Size: MF
    Click here for detailed picture of above image.

    Important: DO NOT start the cut with a jab or poke.

  7. At the trim cover edge (2), using a razor blade or an equivalent sharp tool, slice through the factory heat element material along the cut-line until a hole is created.
  8. Insert your finger(s) through the hole and lift the factory heat element material (1) away from the trim cover material.
  9. Important: DO NOT cut through seams.

  10. Using scissors and/or a razor blade, continue cutting the factory heat element material along the cut-lines.
  11. DHS/DTS and DeVille F/Seat Back


    Object Number: 855794  Size: MF
    Click here for detailed picture of above image.
  12. Fold back the centers (1) of the factory heat element material. Insert the service heat element (2), with the backing paper side up, between the trim cover material and the factory heat element material.
  13. Carefully remove the backing paper from the service heat element. Ensure the service heat element is laying flat.
  14. Unfold the centers (1) of the factory heat element material.
  15. DHS/DTS and DeVille F/Seat Back


    Object Number: 855795  Size: MF
    Click here for detailed picture of above image.
  16. Match the edges of the factory heat element material and cover the cut-lines with 3M® HighlandTM Cloth Duct Tape, P/N 6969, or equivalent. Ensure the service and factory heat elements are laying flat.
  17. On DHS & DTS seat cushion installations: Connect the two thigh heat element electrical connectors to the center heat element.
  18. Install the seat trim cover. Refer to the appropriate seat trim cover installation procedure in the Seats sub-section of the Service Manual.
  19. On front seat assembly installations: Install the fasteners that retain the seat cushion to the seat adjuster.
  20. Tighten
    Tighten the fasteners to 9 N·m (80 lb in).

  21. Place the seat assembly inside the vehicle. DO NOT install at this time.
  22. Verify the seat heat function is operational.
  23. Complete the seat assembly installation. Refer to the appropriate seat replacement procedure in the Seats sub-section of the Service Manual.
  24. Parts Information

    Model

    Part Number

    Description

    FRONT

    DeVille

    25740850

    F/Seat Back Cushion Heater

    DHS & DTS

    25715920

    DeVille

    25740851

    F/Seat Cushion Heater

    DHS & DTS

    25715921

    DHS & DTS

    25715924

    F/Seat Cushion (LH Thigh) Heater

    DHS & DTS

    25715925

    F/Seat Cushion (RH Thigh) Heater

    REAR

    DeVille LH

    25740852

    R/Seat Back Cushion Heater

    DeVille RH

    25740853

    DHS & DTS

    25715926

    DeVille LH

    25740854

    R/Seat Cushion Heater

    DeVille RH

    25740855

    DHS & DTS

    25715927

    DHS & DTS

    25715928

    R/Seat Cushion (LH Thigh) Heater

    DHS & DTS

    25715929

    R/Seat Cushion (RH Thigh) Heater

    Parts are currently available from GMSPO.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Last | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • Dave Nova's Avatar

    Dave Nova

    Cadillac Technician

    Satisfied Customers:

    1469
    ASE Master Certification. GM World Class Certification
< Last | Next >
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Cadillac Technician

    Satisfied Customers:

    1469
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/JF/JFN1/2011-2-26_33039_180754101501129867381533152761315265045893127711n.64x64.jpg Jerry Newton's Avatar

    Jerry Newton

    Cadillac Technician

    Satisfied Customers:

    1181
    ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
  • http://ww2.justanswer.com/uploads/PE/peterpete190/2012-2-24_1274_20120215135406.64x64.jpg Pete's Avatar

    Pete

    Cadillac Technician

    Satisfied Customers:

    1133
    15 years Cadillac experience as a technician.
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    ASE Certified Technician

    Satisfied Customers:

    941
    ASE CERTIFICATIONS A1-A8 & L1 / 40 YEARS AUTOMOTIVE EXPERIENCE
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    595
    ASE Master Tech 15+ Years
  • http://ww2.justanswer.com/uploads/MO/molurch/2012-6-6_214526_500.64x64.png Don 'Mo Lurch''s Avatar

    Don 'Mo Lurch'

    Cadillac Technician

    Satisfied Customers:

    462
    GM, Cadillac Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
  • http://ww2.justanswer.com/uploads/tsmodie/2009-6-10_144056_tim.jpg Tim Mohr's Avatar

    Tim Mohr

    ASE MASTER TECH

    Satisfied Customers:

    385
    30 YRS EXPERIENCE, FOREIGN AND DOMESTIC, GAS AND DEISEL