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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1577 (Seat Heating System & Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B1925 or B2170 (Dealer Installed) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

B1925 02 or B1925 05

  1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
  2. Test for 850 Ω - 300 kΩ between the signal circuit terminal 9 X4 and the low reference circuit terminal 6 X2.
    • 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.
    • 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.
  3. Connect the X2, X4 harness connectors at the HSM.
  4. Disconnect the harness connector at the seat cushion heater element/temperature sensor.
  5. Ignition ON, test for 4.8-5.2 V 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 HSM.
    • 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 HSM.
  6. If all circuits test normal, replace the HSM.

B2170 02 or B2170 05

  1. Ignition OFF, disconnect the X2, X4 harness connectors at the HSM.
  2. Test for 850 Ω - 300 kΩ between the signal circuit terminal 20 X4 and the low reference circuit terminal 8 X2.
    • 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.
    • 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.
  3. Connect the X2, X4 harness connectors at the HSM.
  4. Disconnect the harness connector at the seat cushion heater element/temperature sensor.
  5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal C and ground.
    • 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 HSM.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the HSM.
  6. If all circuits test normal, replace the HSM.
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