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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Seat Heating System And Seat Cooling System) >> Diagnostic Information and Procedures >> Heated/Cooled Seats Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. 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 C1 harness connector at the CCSM.
  2. Ignition OFF, test for less than 5 ohms of resistance between the ground circuit terminal M and ground.
    • If greater than 5 ohms, 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. Ignition OFF, disconnect the C2 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/Cooled Seat Inoperative

  1. Ignition OFF, disconnect the C3 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 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 memory seat module.
    • If the test lamp is ON with the switch in the OFF position, test the signal circuit for a short to ground. If the circuit tests normal, replace the memory seat module.
  4. Ignition OFF, connect the C3 harness connector at the CCSM.
  5. Disconnect the harness connector at the seat cushion ventilation heat and cool module.
  6. Ignition ON, verify that a test lamp illuminates between the control circuits listed below and ground, while commanding the related Driver Seat Heat Cmd. and the Driver Seat Cool Cmd. ON and OFF with a scan tool.
    • Seat cushion heat control circuit terminal 1
    • Seat cushion cool control circuit terminal 3
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the climate control seat module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the climate control seat module.
  7. Ignition OFF, connect the harness connector at the seat cushion ventilation heat and cool module.
  8. Disconnect the harness connector at the seat back ventilation heat and cool module.
  9. Ignition ON, verify that a test lamp illuminates between the control circuits listed below and ground, while commanding the related Driver Seat Heat Cmd. and the Driver Seat Cool Cmd. ON and OFF with a scan tool.
    • Seat back heat control circuit terminal 1
    • Seat back cool control circuit terminal 3
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the climate control seat module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the climate control seat module.

Passenger Heated/Cooled Seat Inoperative

  1. Ignition OFF, disconnect the C3 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 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 memory seat module.
    • If the test lamp is ON with the switch in the OFF position, test the signal circuit for a short to ground. If the circuit tests normal, replace the memory seat module.
  4. Ignition OFF, connect the C3 harness connector at the CCSM.
  5. Disconnect the harness connector at the seat cushion ventilation heat and cool module.
  6. Ignition ON, verify that a test lamp illuminates between the control circuits listed below and ground, while commanding the related Driver Seat Heat Cmd. and the Driver Seat Cool Cmd. ON and OFF with a scan tool.
    • Seat cushion heat control circuit terminal 1
    • Seat cushion cool control circuit terminal 3
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the climate control seat module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the climate control seat module.
  7. Ignition OFF, connect the harness connector at the seat cushion ventilation heat and cool module.
  8. Disconnect the harness connector at the seat back ventilation heat and cool module.
  9. Ignition ON, verify that a test lamp illuminates between the control circuits listed below and ground, while commanding the related Driver Seat Heat Cmd. and the Driver Seat Cool Cmd. ON and OFF with a scan tool.
    • Seat back heat control circuit terminal 1
    • Seat back cool control circuit terminal 3
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the climate control seat module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the climate control seat module.
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