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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 95 (Seat Heating System And Seat Cooling System) >> Diagnostic Information and Procedures >> DTC B242A: Seat Heaters (With Memory A45) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  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 infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, 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 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 1 V between the control circuit terminals listed below and ground:
    • Terminal 11
    • Terminal 10
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

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