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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1323 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B2435 or B2440 >> Circuit/System Testing >> B2440 02 or B2440 05

B2440 02 or B2440 05

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  1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.
    2. IMPORTANT: When measuring the resistance, the resistance values are based on the seat being at room temperature of 20°C (68°F).
  2. Test for 850-300K ohms between the signal circuit terminal 3 X5 and the low reference circuit terminal 5 X2.
    • 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.
    • 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.
  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 volts between the 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 ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  6. If all circuits test normal, replace the MSM.
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