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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Body & Frame >> Seats >> Seat Heating System And Seat Cooling System >> Diagnostic Information and Procedures >> DTC B2425 or B2430: Seat Cushion Heater (With Memory A45) >> Circuit/System Testing

Circuit/System Testing

B2425 0B, B2425 0D, or B2425 0E

  1. Ignition OFF, disconnect the X4 harness connector at the K40 Seat Memory Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 5 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF.
    2. Test for less than 2Ω in the B+ circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, verify the fuse is not open and there is voltage at the circuit breaker.
    • If the test lamp illuminates 
  3. Ignition OFF, connect the X4 harness connector at the K40 Seat Memory Control Module and disconnect the harness connector at the E14A Seat Heating Element - Driver Back.
    4. NOTE:

    Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.

  4. Test for 0.5-2Ω between control circuit terminal 1 and control circuit terminal 2.
    • If not between 0.5-2Ω 

      Replace the E14A Seat Heating Element - Driver Back.

    • If between 0.5-2Ω 
  5. Connect the harness connector at the E14A Seat Heating Element - Driver Back and disconnect the X3 harness connector at the K40 Seat Memory Control Module.
  6. Test for 1-5Ω between control circuit terminal 11 and control circuit terminal 6.
    • If less than 1Ω 
    1. Ignition OFF, disconnect the harness connector at the E14B Seat Heating Element - Driver Cushion.
    2. Test for infinite resistance between the control circuits.
      • If less than infinite resistance, repair the short between the circuits.
      • If infinite resistance, test or replace the E14B Seat Heating Element - Driver Cushion.
    • If greater than 5Ω 
    1. Ignition OFF, disconnect the harness connector at the E14B Seat Heating Element - Driver Cushion.
    2. Test for less than 2Ω in the control circuits end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, test or replace the E14B Seat Heating Element - Driver Cushion.
    • If between 1-5Ω 
  7. Replace the K40 Seat Memory Control Module.

B2430 0B, B2430 0D, or B2430 0E

  1. Ignition OFF, disconnect the X4 harness connector at the K40 Seat Memory Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 5 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF.
    2. Test for less than 2Ω in the B+ circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, verify the fuse is not open and there is voltage at the circuit breaker.
    • If the test lamp illuminates 
  3. Ignition OFF, connect the X4 harness connector at the K40 Seat Memory Control Module and disconnect the harness connector at the E14C Seat Heating Element - Passenger Back.
    4. NOTE:

    Element resistance must be measured twice to ensure that all failure conditions are simulated. First with the seat unoccupied, then with the seat occupied.

  4. Test for 0.5-2Ω between control circuit terminal 1 and control circuit terminal 2.
    • If not between 0.5-2Ω 

      Replace the E14C Seat Heating Element - Passenger Back.

    • If between 0.5-2Ω 
  5. Connect the harness connector at the E14C Seat Heating Element - Passenger Back and disconnect the X3 harness connector at the K40 Seat Memory Control Module.
  6. Test for 1-5Ω between control circuit terminal 10 and control circuit terminal 4.
    • If less than 1Ω 
    1. Ignition OFF, disconnect the harness connector at the E14D Seat Heating Element - Passenger Cushion.
    2. Test for infinite resistance between the control circuits.
      • If less than infinite resistance, repair the short between the circuits.
      • If infinite resistance, test or replace the E14D Seat Heating Element - Passenger Cushion.
    • If greater than 5Ω 
    1. Ignition OFF, disconnect the harness connector at the E14D Seat Heating Element - Passenger Cushion.
    2. Test for less than 2Ω in the control circuits end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, test or replace the E14D Seat Heating Element - Passenger Cushion.
    • If between 1-5Ω 
  7. Replace the K40 Seat Memory Control Module.
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