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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1007 (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 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

B2425

  1. Ignition OFF, disconnect the X1 harness connector at the MSM.
  2. Test for less than 15 ohms between the heater element supply voltage circuit terminal 14 and the control circuit terminal 11.
    • 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 X2, X5 harness connectors at the MSM.
  4. Test for 850-300k ohms between the temperature sensor signal circuit terminal 1 X5 and the low reference circuit terminal 3 X2.
    • If greater than the specified range, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion heater element.
    • 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.
  5. Connect the X1, X2, X5 harness connectors at the MSM.
  6. Disconnect the harness connector at the seat cushion heater element.
  7. Ignition ON, test for 4.8-5.2 volts between the temperature sensor 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 MSM.
    • If less than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.
  8. If all circuits test normal, replace the MSM.

B2430 Front

  1. Ignition OFF, disconnect the X1, X4 harness connector at the MSM.
  2. Test for less than 15 ohms between the heater element supply voltage circuit terminal 6 X1 and the control circuit terminal 14 X4.
    • 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 X2, X5 harness connectors at the MSM.
  4. Test for 850-300k ohms between the temperature sensor signal circuit terminal 2 X5 and the low reference circuit terminal 6 X2.
    • If greater than the specified range, test the signal circuit and low reference circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion heater element.
    • 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.
  5. Connect the X1, X2, X4, X5 harness connectors at the MSM.
  6. Disconnect the harness connector at the seat cushion heater element.
  7. Ignition ON, test for 4.8-5.2 volts between the temperature sensor 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 MSM.
    • If less than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the MSM.
  8. If all circuits test normal, replace the MSM.
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