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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 B242A: Seat Heaters Common Circuit Short to Battery/Ground (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 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 X3 harness connector at the K40 Seat Memory Control Module.
  4. Test for infinite resistance between the control circuit terminals listed below and ground:
    • terminal 11
    • terminal 10
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  5. Ignition ON.
  6. Test for less than 1V between the control circuit terminals listed below and ground:
    • terminal 11
    • terminal 10
    • If 1V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1V 
  7. Replace the K40 Seat Memory Control Module.
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