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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 >> DTC B103A or B1111 >> 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.
  1. Ignition OFF, disconnect the C1 harness connector at the climate control seat module.
  2. Test for infinite resistance between the following control circuits and ground:
    • Seat cushion heat control circuit terminal G
    • Seat cushion cool control circuit terminal H
    • Seat back heat control circuit terminal J
    • Seat back cool control circuit terminal K
    • If less than infinite, test the appropriate control circuit for a short to ground.
  3. Ignition OFF, disconnect the harness connectors at the seat cushion and seat back ventilation heat and cool modules.
    IMPORTANT: The test leads must be connected in the correct polarity, otherwise lower out of range values will appear. Use the Positive Lead for the COOL control circuit and the Negative Lead for the HEAT control circuit. If the resistance is measured with the seat still warm or cool, the resistance values will vary even if the system was powered up for just a few seconds. The TED must be allowed to stabilize to room temperature prior to a measurement. The following conditions will change the resistance to out of range values:
    • The test leads are incorrectly connected
    • Air blowing across the TED
    • Measuring the resistance at other than room temperature of 70°F
    • Holding the TED portion of the heated and cool ventilation module in your hand

      • In hotter or colder climates where room temperature conditions of 70°F (21°C) may be unattainable, resistance values may read above the specified range. Use a heat gun or a blower to warm or cool the TED while measuring the resistance. The resistance values should slowly lower toward the specified range.

  4. From the seat cushion ventilation module side of the harness connector, test for 0.9-10.0 ohms of resistance between the heat control circuit terminal 1 and the cool control circuit terminal 3.
    • If not within the specified range, replace the seat cushion ventilation heat and cool module.
  5. From the seat back ventilation module side of the harness connector, test for 0.9-10.0 ohms of resistance between the heat control circuit terminal 1 and the cool control circuit terminal 3.
    • If not within the specified range, replace the seat back ventilation heat and cool module.
  6. If all circuits test normal, replace the climate control seat module.
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