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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 470 (Seat Heating System And Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B2435 or B2440 (w/o HP2 with Memory) >> Circuit/System Testing

Circuit/System Testing

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B2435 02 or B2435 05

  1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.
  2. Test for 850 Ω - 300 kΩ between the signal circuit terminal 4 X5 and the low reference circuit terminal 2 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, X5 harness connectors at the MSM.
  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 MSM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.
  6. If all circuits test normal, replace the MSM.

B2440 02 or B2440 05

  1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.
  2. Test for 850 Ω - 300 kΩ between the signal circuit terminal 3 X5 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, X5 harness connectors at the MSM.
  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 MSM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.
  6. If all circuits test normal, replace the MSM.
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