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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1143 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B1925 or B2170 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.

B1925 Left Seat Cushion Sensor

  1. Ignition OFF, disconnect the X2, X5 harness connectors at the memory seat module.
    2. IMPORTANT: If the resistance is measured with the seat still warm, the resistance may vary within the specified range depending on the temperature of the seat.
  2. Test for 1.9K-300K ohms between the 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 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 temperature sensor.
  3. Ignition OFF, connect the X2, X5 harness connectors at the memory seat module.
  4. Disconnect the harness connector at the seat cushion heating 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 memory seat module.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the memory seat module.
  6. If all circuits test normal, replace the memory seat module.

B2170 Right Seat Cushion Sensor

  1. Ignition OFF, disconnect the X2, X5 harness connectors at the memory seat module.
    2. IMPORTANT: If the resistance is measured with the seat still warm, the resistance may vary within the specified range depending on the temperature of the seat.
  2. Test for 1.9K-300K ohms between the 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 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 temperature sensor.
  3. Ignition OFF, connect the X2, X5 harness connectors at the memory seat module.
  4. Disconnect the harness connector at the seat cushion heating 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 memory seat module.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the memory seat module.
  6. If all circuits test normal, replace the memory seat module.
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