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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 91 (Seat Heating System And 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 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate seat cushion heating element listed below. It may take up to 2 min for all vehicle systems to power down.
    • E14B Seat Heating Element - Driver Cushion
    • E14D Seat Heating Element - Passenger Cushion
  2. Test for less than 10 Ω between the low reference circuit terminal 1 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K29F Seat Heating Control Module - Front.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • I less than 2 Ω, replace the K29F Seat Heating Control Module - Front.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for 4.8 - 5.2 V between the signal circuit terminal 2 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K29F Seat Heating Control Module - Front.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K29F Seat Heating Control Module - Front.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the X3 harness connector at the K29F Seat Heating Control Module - Front, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K29F Seat Heating Control Module - Front.
    • Go to next step: If between 4.8 - 5.2 V 
  5. Test or replace the E14 Seat Heating Element - Cushion.
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