TECHNICAL Date: Subject: Driver Or Passenger Heated Seat .

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Seats - Driver/Passenger Heated Seats Inop./Slow to WarmTECHNICALBulletin No.: 10-08-50-008BDate: January 13, 2011Subject: Driver or Passenger Heated Seat Inoperative, Slow to Warm, DTC(s) Set(Repair Connector, Re-Route Harness)Models:2007-2010 Cadillac Escalade, Escalade ESV, Escalade EXT2007-2010 Chevrolet Silverado, Suburban, Tahoe2011 Chevrolet Silverado Heavy Duty2007-2010 GMC Sierra, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL2011 GMC Sierra Heavy DutyAll Equipped with Heated Front Seat (RPO AN3, KA1) or Heated and Cooled Seat(RPO KB6) and/or Luxury Package (RPO PCK)Supercede:This bulletin is being revised to update the RPOs. Please discard Corporate BulletinNumber 10-08-50-008A (Section 08 - Body and Accessories).ConditionSome customers may comment that the driver or passenger heated seat system exhibitsthe following symptoms:- Heated seat turns on and then turns off within 1 to 10 minutes (at any 60 secondinterval).- The system doesn't get warm enough, or gets warm very slowly.- The heated seat system is completely inoperative.Upon further review, DTCs B2430 0D and/or B2180 0D may be set as a current orhistory code if the vehicle is equipped with heated seats only (RPO KA1). Also, theLED indicator for the heated seats may come On and then flash after approximately 1minute, then go out.If the vehicle is equipped with heated and cooled seats (KB6), the switch LEDindicator may stay On, but the heated and cooled seat is inoperative. The fan willcontinue to blow air.Cause

Heated Seats (RPO AN3, KA1)The heated seat control circuit terminal and/or ground terminal in harness connectorX1 to the memory seat module (MSM) may have lost tension and is loose. Thereduced terminal tension increases resistance in the connector, which may result in thesymptoms described above.Heated and Cooled Seats (RPO KB6)The thermo-electric device (TED) in the seat cushion/seat back ventilation heating andcooling module may have become inoperative.CorrectionHeated Seats (RPO AN3, KA1)Follow the steps below to correct the concern with the heated seats.NoteThis repair requires a unique anti-abrasion electrical tape and harness clip from KentAutomotive. Refer to the Parts Information below.1. Access and remove the seat bolts/nuts.2. Adjust the seat rearward about halfway. Adjust the seat recline full forward.3. Tilt the seat backward to access the bottom of the seat. Prop the seat up with asuitable tool if required.

4. Disconnect seat harness connectors (1) X1, X2, X3 and X4 from the MSM.5. Identify connector X1. Refer to Component Connector End Views in SI.6. Perform a terminal drag test on connector X1, paying special attention toterminals 1, 4, 6, 11 and 14. Using an equivalent male terminal from the J-38125,test that the retention force is significantly different between a good terminal and asuspect terminal. Refer to Testing for Intermittent Conditions and PoorConnections in SI.7. Replace any terminal in question including connector X1 terminals 1, 4, 6, 11 and14 if necessary. Refer to Repairing Connector Terminals in SI.8. Identify connector X4. Refer to Component Connector End Views in SI.9. Perform the terminal drag test described in step 6, paying special attention toterminal 14.10. Replace any terminal in question including connector X4 terminal 14 if necessary.Refer to Repairing Connector Terminals in SI.

11. Remove the harness clip (1) from the plastic carrier.

12. Cut the electrical tape holding the harness in the plastic carrier using a sharputility knife in the area shown (1).13. Free the harness from the carrier back to the area shown (1).14. Obtain "*Woven Polyester (PET) Electrical Tape" (Special Order P/NRZ97156A00) from Kent Automotive. Refer to Parts Information below.ImportantDO NOT substitute with vinyl electrical tape or friction tape. Use only thetape specified above.

15. Tape the harness starting at the MSM connectors (1) extending back to the newbreak-out location (2) in the plastic carrier.

16. Install a plastic tie strap around the harness and the plastic carrier at the break-outpoint (1).17. Install the new harness edge clip (1) 10 mm (0.4 in) further from the connectorsand the existing harness clip. Ensure the clip is installed in the orientation shown.

18. Install the harness with the new harness clip in the location shown (1).

19. Reinstall the harness connectors (1) to the MSM.20. Reinstall the seat to the vehicle.Heated and Cooled Seats (RPO KB6)Follow the steps below to correct the concern with the heated and cooled seats.1. Inspect the ventilation heating and cooling module for a concern with the TED.Refer to Seat Heating and Cooling, Diagnostic Information and Procedures in SI.NoteIf the heated and cooled seat function is inoperative, but the heat switch indicatorsare On, the MSM is functioning properly and the concern is with the TED.2. If the TED is found to be the concern, replace the seat cushion or seat backventilation heating and cooling module. Refer to Driver or Passenger Seat BackVentilation Heating and Cooling Blower Replacement or Driver or Passenger SeatCushion Ventilation Heating and Cooling Blower Replacement in SI. If the TED isnot the concern, follow normal diagnostics and repair in SI.

2007-2010 Cadillac Escalade, Escalade ESV, Escalade EXT 2007-2010 Chevrolet Silverado, Suburban, Tahoe 2011 Chevrolet Silverado Heavy Duty 2007-2010 GMC Sierra, Yukon, Yukon XL, Yukon Denali, Yukon Denali XL 2011 GMC Sierra Heavy Duty All Equipped with Heated Front Seat (RPO AN3, KA1) or Heated and Cooled Seat

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