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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1577 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> Heated/Cooled Seats Inoperative (KB6) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Driver and Passenger Heated/Cool Seats Inoperative

  1. Ignition OFF, disconnect the X1 harness connector at the CCSM.
  2. Verify that a test lamp illuminates between the ground circuit terminal M and B+.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal E and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Disconnect the X2 harness connector at the CCSM.
  5. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  6. If all circuits test normal, replace the CCSM.

Driver Heated/Cool Seat Circuit System Test

  1. Ignition OFF, disconnect the X3 harness connector at the CCSM.
  2. Connect a test lamp between the signal circuit terminal 14 and B+.
  3. Ignition ON, press the HEAT or COOL seat switch through the high, medium, and low positions to OFF. The test lamp should illuminate until the OFF position is reached.
    • If the test lamp does not illuminate, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the MSM.
    • If the test lamp remains ON with the switch in the OFF position, test the signal circuit for a short to ground. If the circuit tests normal, replace the MSM.
  4. Connect the X3 harness connector at the CCSM.
  5. Disconnect the harness connector at the seat cushion ventilation heating and cooling module.
  6. Test for less than 5 Ω between the low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the CCSM.
  7. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal 5 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    8. NOTE: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
  8. Ignition OFF then ON, connect a test lamp between the control circuits listed below and ground. Press the HEAT switch when testing the heat control circuit and the COOL switch when testing the cool control circuit. The test lamp should illuminate or slowly illuminate for approximately 2 - 4 seconds after the switch is pressed. On the heat control circuit, the test lamp may exhibit a 4 second delay before it starts to illuminate.
    • Seat cushion heat control circuit terminal 1
    • Seat cushion cool control circuit terminal 3
    • If the test lamp does not illuminate, test the appropriate control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If the test lamp is always ON, test the appropriate control circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    9. NOTE: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
  9. Ignition OFF then ON, connect a test lamp between the circuits listed below and ground. The test lamp should illuminate or slowly illuminate for approximately 5 seconds after pressing the HEAT switch.
    • Seat cushion blower control circuit terminal 2
    • Seat cushion blower speed control circuit terminal 7
    • If the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If the test lamp is always ON, test the appropriate circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
  10. Ignition OFF, connect the harness connector to the seat cushion ventilation heating and cooling module.
  11. Disconnect the harness connector at the seat back ventilation heating and cooling module.
  12. Test for less than 5 Ω between the low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the CCSM.
  13. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal 5 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    14. NOTE: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
  14. Ignition OFF then ON, connect a test lamp between the control circuits listed below and ground. Press the HEAT switch when testing the heat control circuit and the COOL switch when testing the cool control circuit. The test lamp should illuminate or slowly illuminate for approximately 4 seconds after the switch is pressed. On the heat control circuit, the test lamp may exhibit a 4 second delay before it starts to illuminate.
    • Seat back heat control circuit terminal 1
    • Seat back cool control circuit terminal 3
    • If the test lamp does not illuminate, test the appropriate control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If the test lamp is always ON, test the appropriate control circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    15. NOTE: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
  15. Ignition OFF then ON, connect a test lamp between the circuits listed below and ground. The test lamp should illuminate or slowly illuminate for approximately 5 seconds after pressing the HEAT switch.
    • Seat back blower control circuit terminal 2
    • Seat cushion blower speed control circuit terminal 7
    • If the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If the test lamp is always ON, test the appropriate circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
  16. If all circuits test normal, test or replace the appropriate seat cushion or seat back ventilation heating and cooling module.

Passenger Heated/Cool Seat Circuit System Test

  1. Ignition OFF, disconnect the X3 harness connector at the CCSM.
  2. Connect a test lamp between the signal circuit terminal 6 and B+.
  3. Ignition ON, press the HEAT or COOL seat switch through the high, medium, and low positions to OFF. The test lamp should illuminate until the OFF position is reached.
    • If the test lamp does not illuminate, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the MSM.
    • If the test lamp remains ON with the switch in the OFF position, test the signal circuit for a short to ground. If the circuit tests normal, replace the MSM.
  4. Connect the X3 harness connector at the CCSM.
  5. Disconnect the harness connector at the seat cushion ventilation heating and cooling module.
  6. Test for less than 5 Ω between the low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the CCSM.
  7. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal 5 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    8. NOTE: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
  8. Ignition OFF then ON, connect a test lamp between the control circuits listed below and ground. Press the HEAT switch when testing the heat control circuit and the COOL switch when testing the cool control circuit. The test lamp should illuminate or slowly illuminate for approximately 2 - 4 seconds after the switch is pressed. On the heat control circuit, the test lamp may exhibit a 4 second delay before it starts to illuminate.
    • Seat cushion heat control circuit terminal 1
    • Seat cushion cool control circuit terminal 3
    • If the test lamp does not illuminate, test the appropriate control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If the test lamp is always ON, test the appropriate control circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    9. NOTE: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
  9. Ignition OFF then ON, connect a test lamp between the circuits listed below and ground. The test lamp should illuminate or slowly illuminate for approximately 5 seconds after pressing the HEAT switch.
    • Seat cushion blower control circuit terminal 2
    • Seat cushion blower speed control circuit terminal 7
    • If the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If the test lamp is always ON, test the appropriate circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
  10. Ignition OFF, connect the harness connector to the seat cushion ventilation heating and cooling module.
  11. Disconnect the harness connector at the seat back ventilation heating and cooling module.
  12. Test for less than 5 Ω between the low reference circuit terminal 4 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the CCSM.
  13. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal 5 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    14. NOTE: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
  14. Ignition OFF then ON, connect a test lamp between the control circuits listed below and ground. Press the HEAT switch when testing the heat control circuit and the COOL switch when testing the cool control circuit. The test lamp should illuminate or slowly illuminate for approximately 4 seconds after the switch is pressed. On the heat control circuit, the test lamp may exhibit a 4 second delay before it starts to illuminate.
    • Seat back heat control circuit terminal 1
    • Seat back cool control circuit terminal 3
    • If the test lamp does not illuminate, test the appropriate control circuit for a short to ground or an open high resistance. If the circuit tests normal, replace the CCSM.
    • If the test lamp is always ON, test the appropriate control circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
    15. NOTE: The ignition must be cycled OFF then ON between each test in order to reset the CCSM.
  15. Ignition OFF then ON, connect a test lamp between the circuits listed below and ground. The test lamp should illuminate or slowly illuminate for approximately 5 seconds after pressing the HEAT switch.
    • Seat back blower control circuit terminal 2
    • Seat back blower speed control circuit terminal 7
    • If the test lamp does not illuminate, test the appropriate circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the CCSM.
    • If the test lamp is always ON, test the appropriate circuit for a short to voltage. If the circuit tests normal, replace the CCSM.
  16. If all circuits test normal, test or replace the appropriate seat cushion or seat back ventilation heating and cooling module.
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