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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Body & Frame >> Seats >> Seat Heating And Cooling >> Diagnostic Information and Procedures >> DTC B2425 or B2430 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the MSM or rear head seat module connector X1, or X1 and X4 for front passenger.
  2. Verify less than 15 ohms of resistance through the seat cushion heater element from the voltage supply circuit terminal to the low side drive control circuit terminal in the harness connector.
    • If the resistance is greater than 15 ohms test the supply and control circuits for an open/high resistance. If the circuits test normal replace the seat cushion heater element.
  3. Disconnect the MSM connectors X2 and X5, or the rear heated seat module connectors X2 and CX4.
  4. Verify the resistance through the seat cushion heat sensor is 850-300K ohms from the signal circuit terminal to the low reference circuit terminal in the harness connectors.
    • If greater than 300K ohms, test the signal circuit and low reference circuit for an open/high resistance. If the circuits test normal, replace the seat cushion heater element.
    • If less than 850 ohms, replace the seat cushion heater element.
  5. Connect the MSM or rear heated seat module connectors.
  6. Disconnect the seat cushion heater element connector.
  7. Ignition ON, verify that the heat sensor signal circuit voltage from the MSM or rear heated seat module is not greater than 5 volts.
    • If the signal circuit is greater than 5 volts test for a short to voltage. If the circuit tests normal replace the MSM or rear heated seat module.
  8. If the circuits test normal replace the seat cushion heater element.
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