Subject: | Front/Rear Heated Seat Inoperative/Cold (Install Seat Heat Element) |
Models: | 1998-2004 Cadillac Seville with RPO KA1 |
This bulletin is being revised to update the model year, VIN numbers and includes rear seat information. Please discard Corporate Bulletin Number 01-08-50-002B (Section 08-Body and Accessories).
Important: This service bulletin includes rear seat diagnostic and part information.
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 the HEAT/OFF switch is activated.
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.
Location | Description |
---|---|
1 | LH/RH Front Seat Back-Center Heat Element |
2 | LH/RH Front Seat Cushion-Center Heat Element |
3 | LH/RH Front Seat Cushion-Outer Heat Element |
4 | LH/RH Front Seat Cushion-Inner Heat Element |
5 | LH/RH Front Seat Back-Outer Heat Element |
6 | LH/RH Front Seat Back-Inner Heat Element |
7 | 25755073(LH) or 25762972(RH) -Front Seat Back Heater Pkg |
8 | 25755076-Front Seat Cushion Heater Pkg-LH/RH |
• | If yes, go to Step 6. |
• | If no, go to Step 12 in order to determine which of the three front seat back heat elements has a resistance value NOT within the specified range. |
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.
• | If yes, go to Step 8. |
• | If no, install a front seat cushion center heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | 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 9 order to determine which of the three front seat cushion heat elements has a resistance value NOT within the specified range. |
• | If yes, go to Step 11. |
• | If no, install a front seat cushion outer heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | 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 inner heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | If yes, go to Step 16. |
• | If no, install a front seat back outer heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | If yes, install a front seat back center heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | If no, install a front seat back inner heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
Location | Description |
---|---|
1 | LH/RH Rear Seat Back-Center Heat Element |
2 | LH/RH Rear Seat Cushion-Center Heat Element |
3 | LH/RH Rear Seat Cushion-Outer Heat Element |
4 | LH/RH Rear Seat Cushion-Inner Heat Element |
5 | LH/RH Rear Seat Back-Outer Heat Element |
6 | LH/RH Rear Seat Back-Inner Heat Element |
7 | 25755082(LH) or 25762973(RH) -Rear Seat Back Heater Pkg |
8 | 25755085(LH) or 25762974(RH)-Rear Seat Cushion Heater Pkg |
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.
• | For the LH rear seat cushion, measure between cavities A and B. |
• | For the RH rear seat cushion, measure between cavities E and F. |
• | If yes, go to Step 4. |
• | If no, install a LH/RH rear seat cushion (center) heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | For the LH rear seat cushion, measure between cavities C and D. |
• | For the RH rear seat cushion, measure between cavities G and H. |
• | If yes, go to Step 10. |
• | If no, go to Step 6 in order to determine which of the three rear seat cushion heat elements has a resistance value NOT within the specified range. |
• | If yes, go to Step 9. |
• | If no, install a LH/RH rear seat cushion inner heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | 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 LH/RH rear seat cushion outer heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | If yes, the resistance values of the LH/RH rear seat heat back and cushion 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. |
• | If no, disconnect the green 2-way connectors between the seat back center heat element and the seat back inner and outer heat elements. |
• | If yes, go to Step 14. |
• | If no, install a rear seat back inner heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | If yes, install a rear seat back center heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | If no, install a rear seat back outer heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
Location | Description |
---|---|
1 | LH/RH Front Seat Back-Center Heat Element |
2 | LH/RH Front Seat Cushion-Center Heat Element |
3 | LH/RH Front Seat Cushion-Outer Heat Element |
4 | LH/RH Front Seat Cushion-Inner Heat Element |
5 | 25755074-Front Seat Back Heater Pkg-LH/RH |
6 | 25755077-Front Seat Cushion Heater Pkg-LH/RH |
• | 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. |
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.
• | If yes, go to Step 8. |
• | If no, install a front seat cushion center heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | 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 9 in order to determine which of the three front seat cushion heat elements has a resistance value NOT within the specified range. |
• | If yes, go to Step 11. |
• | If no, install a front seat cushion outer heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | 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 inner heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
Location | Description |
---|---|
1 | LH/RH Rear Seat Back-Center Heat Element |
2 | LH/RH Rear Seat Cushion-Center Heat Element |
3 | LH/RH Rear Seat Cushion-Outer Heat Element |
4 | LH/RH Rear Seat Cushion-Inner Heat Element |
5 | 25755083 -Rear Seat Back Heater Pkg-LH/RH |
6 | 25755086(LH) or 25762975(RH)-Rear Seat Cushion Heater Pkg |
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.
• | For the LH rear seat cushion, measure between cavities A and B. |
• | For the RH rear seat cushion, measure between cavities E and F. |
• | If yes, go to Step 4. |
• | If no, install a LH/RH rear seat cushion (center) heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | For the LH rear seat cushion, measure between cavities C and D. |
• | For the RH rear seat cushion, measure between cavities G and H. |
• | If yes, go to Step 10. |
• | If no, go to Step 6in order to determine which of the three rear seat cushion heat elements has a resistance value NOT within the specified range. |
• | If yes, go to Step 9. |
• | If no, install a LH/RH rear seat cushion inner heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | 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 LH/RH rear seat cushion outer heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | If yes, the resistance values of the LH/RH rear seat heat back and cushion 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. |
• | If no, install a rear seat back center heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
Location | Description |
---|---|
1 | LH/RH Front Seat Back-Center Heat Element |
2 | LH/RH Front Seat Cushion-Center Heat Element |
3 | 25755075-Front Seat Back Heater Pkg-LH/RH |
4 | 25755078-Front Seat Cushion Heater Pkg-LH/RH |
• | 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. |
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.
• | If yes, go to Step 8. |
• | If no, install a front seat cushion heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | 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. |
Location | Description |
---|---|
1 | LH/RH Rear Seat Back-Center Heat Element |
2 | LH/RH Rear Seat Cushion-Center Heat Element |
3 | 25755084 -Rear Seat Back Heater Pkg-LH/RH |
4 | 25755087-Rear Seat Cushion Heater Pkg-LH/RH |
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.
• | For the LH rear seat cushion, measure between cavities A and B. |
• | For the RH rear seat cushion, measure between cavities E and F. |
• | If yes, go to Step 4. |
• | If no, install a LH/RH rear seat cushion (center) heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | For the LH rear seat cushion, measure between cavities C and D. |
• | For the RH rear seat cushion, measure between cavities G and H. |
• | If yes, go to Step 4. |
• | If no, install a rear seat cushion center heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | If yes, go to Step 6. |
• | If no, install a rear seat cushion center heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
• | If yes, the resistance values of the LH/RH rear seat heat back and cushion 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. |
• | If no, install a rear seat back center heat element. Refer to the Service Heat Element Installation Procedure in this bulletin. |
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, verify that the resistance values are within the specified range. Refer to the following table:
Range | Description |
---|---|
Less than 5 ohms | Seat Back Cushion Ctr Element |
Seat Back Inner/Outer Element | |
Seat Cushion Ctr Element | |
Seat Cushion Inner/Outer Element | |
Between 850 ohms and 11.5 K ohms | Seat Cushion Ctr Thermistor |
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 existing factory heat element and the seat trim cover.
• | If installing a center heat element, go to Step 4. |
• | If installing an inner or outer heat element, go to Step 6. |
Important: DO NOT start the cut with a jab or poke.
• | Insert your finger(s) through the hole and lift the center heat element material (1) away from the trim cover material. |
• | Use scissors and/or a razor blade to cut the center heat element material along the entire length of the seam (2) from corner to corner. |
• | Ensure the service heat element is laying flat, is tucked into each corner and extends to each side. |
• | Carefully remove the backing paper from the service heat element. |
• | Insert your finger(s) through the hole and lift the inner/outer heat element material (3) away from the trim cover material. |
• | Use scissors and/or a razor blade to create a 20 to 25 cm (8 to 10 inch) opening (4) in the middle of the factory heat element. |
• | Ensure the service heat element is laying flat, is tucked into each corner and extends to each side. |
• | Carefully remove the backing paper from the service heat element. |
1st Design - For 1998 - 2000 Vehicles Built BEFORE VIN YU204670 | |
---|---|
Part Number | Description |
25755073 | Heater Pkg-F/Seat Back Cushion-LH |
25762972 | Heater Pkg-F/Seat Back Cushion-RH |
25755076 | Heater Pkg-F/Seat Cushion-LH/RH |
25755082 | Heater Pkg-R/Seat Back Cushion-LH |
25762973 | Heater Pkg-R/Seat Back Cushion-RH |
25755085 | Heater Pkg-R/Seat Cushion-LH |
25762974 | Heater Pkg-R/Seat Cushion-RH |
2nd Design - For 2000 Vehicles Built AFTER VIN YU204669 to 2001 Vehicles Built BEFORE VIN 1U228114 | |
---|---|
Part Number | Description |
25755074 | Heater Pkg-F/Seat Back Cushion-LH/RH |
25755077 | Heater Pkg-F/Seat Cushion-LH/RH |
25755083 | Heater Pkg-R/Seat Back Cushion-LH/RH |
25755086 | Heater Pkg-R/Seat Cushion-LH |
25762975 | Heater Pkg-R/Seat Cushion-RH |
3rd Design - For 2001 Vehicles Built AFTER VIN 1U228113 thru 2004 MY | |
---|---|
Part Number | Description |
25755075 | Heater Pkg-F/Seat Back Cushion-LH/RH |
25755078 | Heater Pkg-F/Seat Cushion-LH/RH |
25755084 | Heater Pkg-R/Seat Back Cushion-LH/RH |
25755087 | Heater Pkg-R/Seat Cushion-LH/RH |
Parts are currently available from GMSPO.
For vehicles repaired under warranty, use:
Labor Operation | Description | Labor Time |
---|---|---|
C7340* | RH F/Seat Cushion Heated Seat Component Heating Element-Install | 1.1 hr |
ADD | Diagnosis Time | 0.0-0.3 hr |
C7341* | RH F/Seat Back Cushion Heated Seat Component Heating Element-Install | 1.5 hr |
ADD | Diagnosis Time | 0.0-0.3 hr |
C7342* | LH F/Seat Cushion Heated Seat Component Heating Element-Install | 1.1 hr |
ADD | Diagnosis Time | 0.0-0.3 hr |
C7343* | LH F/Seat Back Cushion Heated Seat Component Heating Element-Install | 1.5 hr |
ADD | Diagnosis Time | 0.0-0.3 hr |
C7344* | RH R/Seat Cushion Heated Seat Component Heating Element-Install | 0.9 hr |
ADD | Diagnosis Time | 0.0-0.3 hr |
C7345* | RH R/Seat Back Cushion Heated Seat Component Heating Element-Install | 1.0 hr |
ADD | Diagnosis Time | 0.0-0.3 hr |
C7346* | LH R/Seat Cushion Heated Seat Component Heating Element-Install | 0.9 hr |
ADD | Diagnosis Time | 0.0-0.3 hr |
C7347* | LH R/Seat Back Cushion Heated Seat Component Heating Element-Install | 1.0 hr |
ADD | Diagnosis Time | 0.0-0.3 hr |
*This labor operation is new and will be included in the next update of the Labor Time Guide. |