Sierra 3500 2WD V8-6.0L (2008)
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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.
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If the test lamp illuminates while the switches are in an inactive state, replace the heated seat switch.
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.
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If the test lamp does not illuminate while the switches are in an active state, replace the heated seat switch.
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.
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If the indicators do not illuminate replace the heated seat switch.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. See: Powertrain Management/Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures/Verification Tests and Procedures
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Front Seat Heater Switch Replacement (w/o KB6)
