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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Wiring Systems And Power Management - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P2537: Ignition Accessory Switch >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the control module setting the DTC.
  2. Ignition ON.
  3. Verify a test lamp illuminates between the accessory wake up serial data circuit and ground.
    • If the test lamp does not illuminate. 
    1. Ignition OFF remove the test lamp, disconnect the X4 connector at the K9 Body Control Module.
    2. Test for less than 2Ω on the ignition circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K9 Body Control Module.
    • If the test lamp illuminates 
  4. Replace the control module setting the DTC.
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