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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 B1925 or B2170 (HP2 or Dealer Installed, w/o Memory) >> Circuit/System Testing

Circuit/System Testing

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B1925 02, B1925 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 9 X4 and the low reference circuit terminal 6 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 cushion 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 cushion heater element/temperature sensor.
  3. Connect the X2, X4 harness connectors at the HSM.
  4. Disconnect the harness connector at the seat cushion 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.

B2170 02 or B2170 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 20 X4 and the low reference circuit terminal 8 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 cushion 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 cushion heater element/temperature sensor.
  3. Connect the X2, X4 harness connectors at the HSM.
  4. Disconnect the harness connector at the seat cushion 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.
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