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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B2425 or B2430 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the MSM connector C1, or C1 and C4 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 C2 and C5.
  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 connectors.
  6. Disconnect the seat cushion heater element connector.
  7. Ignition ON, verify that the heat sensor signal circuit voltage from the MSM 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.
  8. If the circuits test normal replace the seat cushion heater element.
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