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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 >> Front Heated Seat Malfunction (With Memory A45) >> Circuit/System Testing

Circuit/System Testing

  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 fuse.
    • If the test lamp illuminates 
  3. Ignition OFF, connect the X4 harness connector at the K40 Seat memory control module, ignition ON,
  4. Verify the scan tool Seat Memory Control Module Driver Seat Heating/Venting/Cooling Mode parameter changes between Off and Back & Cushion Heat after pressing the driver heated seat switch.
    • If the parameter does not change 

      Replace the A26 HVAC controls.

    • If the parameter changes 
  5. Verify the scan tool Passenger Front Seat Heating/Venting/Cooling Mode parameter changes between Off and Back & Cushion Heat after pressing the passenger heated seat switch.
    • If the parameter does not change 

      Replace the A26 HVAC controls.

    • If the parameter changes 
  6. Replace the K40 Seat memory control module.
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