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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 326 (Seat Heating System And Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B2435 or B2440 (HP2 or Dealer Installed w/o Memory) >> Circuit/System Testing

Circuit/System Testing

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B2435 02 or B2435 05

  1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
  2. Test for 850 Ω - 300 kΩ between the signal circuit terminal 19 X4 and the low reference circuit terminal 5 X2.
    • If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat back heater element/temperature sensor.
    • If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat back heater element/temperature sensor.
  3. Connect the X2, X4 harness connectors at the HSM.
  4. Disconnect the harness connector at the seat back heater element/temperature sensor.
  5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C 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 HSM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
  6. If all circuits test normal, replace the HSM.

B2440 02 or B2440 05

  1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
  2. Test for 850 Ω - 300 kΩ between the signal circuit terminal 10 X4 and the low reference circuit terminal 7 X2.
    • If less than the specified range, test for a short between the signal and low reference circuits. If the circuits test normal, replace the seat back heater element/temperature sensor.
    • If greater than the specified range, test the signal and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat back heater element/temperature sensor.
  3. Connect the X2, X4 harness connectors at the HSM.
  4. Disconnect the harness connector at the seat back heater element/temperature sensor.
  5. Ignition ON, test for 4.8 - 5.2 V between the signal circuit terminal C and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
    • 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 HSM.
  6. If all circuits test normal, replace the HSM.
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