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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 B1925 or B2170 >> Circuit/System Testing

Circuit/System Testing

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B1925 02 or B1925 05

  1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.
  2. Test for 850-300K 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 and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion 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 cushion heater element/temperature sensor.
  3. Connect the X2, X5 harness connectors at the MSM.
  4. Disconnect the harness connector at the seat cushion 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.

B2170 02 or B2170 05

  1. Ignition OFF, disconnect the X2, X5 harness connectors at the MSM.
  2. Test for 850-300K 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 and low reference circuits for a short to voltage or an open/high resistance. If the circuits test normal, replace the seat cushion 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 cushion heater element/temperature sensor.
  3. Connect the X2, X5 harness connectors at the MSM.
  4. Disconnect the harness connector at the seat cushion 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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