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Review Strategy Based Diagnosis for an overview of the diagnostic approach. Diagnostic Procedure Instructions provides an overview of each diagnostic category. Circuit/System Description The heated seat system operation is controlled through the switch inputs to the driver and Reference Information Schematic Reference Heated/Cooled Seat Schematics Connector End View Reference Component Connector End Views Description and Operation Heated Seats Description and Operation Electrical Information Reference Circuit Testing Connector Repairs
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for Scan Tool Information Circuit/System Testing 1. Ignition ON, verify that the driver and passenger door switch heated seat switch parameters display Active while the heated seat switches are pressed. If either of the switch parameters are continuously Active or Inactive while the switch 2. Verify that the MSM driver and passenger seat HVC mode and level parameters are displayed correctly as the heated seat switches are activated through all of the operating If the MSM parameters are not displayed correctly replace the MSM. 3. If the circuits test normal replace the driver or passenger door module. Component Testing 1. Disconnect the heated seat switch connector at the door module. 2. Connect a fused jumper wire from the low reference circuit terminal 4 to ground. 3. Verify that a test lamp does not illuminate when connected from battery voltage to the switch signal circuit terminals 6 and 7. If the test lamp illuminates while the switches are in an inactive state, replace the 4. Verify that a test lamp illuminates when connected from battery voltage to the switch signal circuit terminals 6 and 7 while pressing the heated seat switches. If the test lamp does not illuminate while the switches are in an active state, replace the 5. Verify that the heated seat switch indicators illuminate with a test lamp connected from battery voltage to the indicator control circuit terminals 1, 2, 9, 10, and 11. If the indicators do not illuminate replace the heated seat switch. Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Front Seat Heater Switch Replacement (w/o KB6) Control Module References for MSM and Driver or Passenger Door switch replacement, REPAIR INSTRUCTIONS FRONT SEAT HEATER SWITCH REPLACEMENT (W/O KB6) Fig. 3: View Of Seat Heater Switch Assembly, Screws & Trim Panel
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
FRONT SEAT HEATER CONTROL MODULE REPLACEMENT Fig. 4: View Of Front Seat Heater Control Module & Components Callout Component Name 1 Front Side Door Trim Panel 2 Seat Heater Switch Screw (Qty: 2) Tighten: 2 N.m (18 lb in) NOTE: Refer to Fastener Notice . 3 Seat Heater Switch Assembly Callout Component Name
2008 Chevrolet Silverado 1500 2008 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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