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 (1st, 2nd or 3rd Design, Front/Rear) 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.

1st Design-Front Seat Heat Diagnostic Procedure for 1998-2000 MY Built BEFORE VIN YU204670

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 (2) retaining the seat cushion (1) to the seat adjuster.

3. Lift and support the seat cushion assembly away from the seat adjuster assembly.

4. Disconnect the heated seat module (3) harness green, 2-way connector (4).

5. Measure the front seat back total element resistance between cavities A and B. Does the resistance measure less than 5 ohms?

^ 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.

6. Disconnect the heated seat module harness black, 4-way connector (5).

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 cushion thermistor resistance between cavities C and D. Does the resistance measure between 280 ohms and 300K ohms?

^ 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.

8. Measure the front seat cushion total element resistance between cavities A and B. Does the resistance measure less than 5 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 9 order to determine which of the three front seat cushion heat elements has a resistance value NOT within the specified range.

9. Disconnect the white 2-way connectors between the seat cushion center heat element and the seat cushion outer and inner heat elements.

10. Measure the seat cushion outer heat element resistance between cavities A and B at the white 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

11. Measure the seat cushion inner heat element resistance between cavities A and B at the white 2-way connector. Does the resistance measure less than 5 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 inner heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.

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

13. Remove the seat back trim panel in order to access the two white 2-way connectors. Refer to Seat Back Panel Replacement-Front in the Seats sub-section of the Service Manual.

14. Disconnect the white 2-way connectors between the seat back center heat element and the seat back outer and inner heat elements.

15. Measure the seat back outer heat element resistance between cavities A and B at the white 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

16. Measure the seat back inner heat element resistance between cavities A and B at the white 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

1st Design-Rear Seat Heat Diagnostic Procedure for 1998-2000 MY Built BEFORE VIN YU204670

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 A and B.

^ For the RH rear seat cushion, measure between cavities E and F.

3. Does the resistance measure between 280 ohms and 300K ohms?

^ 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.

4. At the blue, 8-way connector C320 (2), measure the rear seat cushion total element resistance.

^ For the LH rear seat cushion, measure between cavities C and D.

^ For the RH rear seat cushion, measure between cavities G and H.

5. Does the resistance measure less than 5 ohms?

^ 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.

6. Partially 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.

7. At the LH/RH rear seat cushion, disconnect the green 2-way connectors between the seat cushion center heat element and the seat cushion inner and outer heat elements.

8. Measure the seat cushion inner heat element resistance between cavities A and B at the green 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

9. Measure the seat cushion outer heat element resistance between cavities A and B at the green 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

10. Remove the rear seat back assembly from the vehicle. Refer to Seat Back Replacement-Rear in the Seats sub-section of the Service Manual.

11. At the LH/RH rear seat back heated seat module, disconnect the green, 2-way connector.

12. Measure the rear seat back total element resistance between cavities A and B. Does the resistance measure less than 5 ohms?

^ 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.

13. Measure the seat back inner heat element resistance between cavities A and B at the green 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

14. Measure the seat back outer heat element resistance between cavities A and B at the green 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

2nd Design-Front Seat Diagnostic Procedure for 2000 MY Built AFTER VIN YU204669 to 2001 MY Built BEFORE VIN 1U228114

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 (2) retaining the seat cushion (1) to the seat adjuster.

3. Lift and support the seat cushion assembly away from the seat adjuster assembly.

4. Disconnect the heated seat module (3) harness green, 2-way connector (4).

5. Measure the front seat back total element resistance between cavities A and B. Does the resistance measure less than 5 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. Disconnect the heated seat module harness black, 4-way connector (5).

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 cushion thermistor resistance between cavities C and D. Does the resistance measure between 280 ohms and 300K ohms?

^ 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.

8. Measure the front seat cushion total element resistance between cavities A and B. Does the resistance measure less than 5 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 9 in order to determine which of the three front seat cushion heat elements has a resistance value NOT within the specified range.

9. Disconnect the white 2-way connectors between the seat cushion center heat element and the seat cushion outer and inner heat elements.

10. Measure the seat cushion outer heat element resistance between cavities A and B at the white 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

11. Measure the seat cushion inner heat element resistance between cavities A and B at the white 2-way connector. Does the resistance measure less than 5 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 inner heat element. Refer to the Service Heat Element Installation Procedure in this bulletin.

2nd Design-Rear Seat Diagnostic Procedure for 2000 MY Built AFTER VIN YU204669 to 2001 MY Built BEFORE VIN 1U228114

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 A and B.

^ For the RH rear seat cushion, measure between cavities E and F.

3. Does the resistance measure between 280 ohms and 300K ohms?

^ 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.

4. At the blue, 8-way connector C320 (2), measure the rear seat cushion total element resistance.

^ For the LH rear seat cushion, measure between cavities C and D.

^ For the RH rear seat cushion, measure between cavities G and H.

5. Does the resistance measure less than 5 ohms?

^ 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.

6. Partially 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.

7. At the LH/RH rear seat cushion, disconnect the green 2-way connectors between the seat cushion center heat element and the seat cushion inner and outer heat elements.

8. Measure the seat cushion inner heat element resistance between cavities A and B at the green 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

9. Measure the seat cushion outer heat element resistance between cavities A and B at the green 2-way connector. Does the resistance measure less than 5 ohms?

^ 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.

10. Remove the rear seat back assembly from the vehicle. Refer to Seat Back Replacement-Rear in the Seats sub-section of the Service Manual.

11. At the LH/RH rear seat back heated seat module, disconnect the green, 2-way connector.

12. Measure the rear seat back total element resistance between cavities A and B. Does the resistance measure less than 5 ohms?

^ 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.

3rd Design-Front Seat Diagnostic Procedure for 2001 MY Built AFTER VIN 1U228113 thru 2004 MY

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 (2) retaining the seat cushion (1) to the seat adjuster.

3. Lift and support the seat cushion assembly away from the seat adjuster assembly.

4. Disconnect the heated seat module (3) harness green, 2-way connector (4).

5. Measure the front seat back total element resistance between cavities A and B. Does the resistance measure less than 5 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. Disconnect the heated seat module harness black, 4-way connector (5).

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 cushion thermistor resistance between cavities C and D. Does the resistance measure between 280 ohms and 300K ohms?

^ 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.

8. Measure the front seat cushion total element resistance between cavities A and B. Does the resistance measure less than 5 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.

3rd Design-Rear Seat Diagnostic Procedure for 2001 MY Built AFTER VIN 1U2281 3 thru 2004 MY

Correction

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