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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 P2534 or P2535: Ignition On/Start Switch >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, and all vehicle systems OFF, disconnect the appropriate harness connector at the control module setting the DTC.
  2. Test for less than 1 V between the ignition circuit terminal and ground.
    • If 1V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1V 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF remove the test lamp.
    2. Test for less than 2Ω in the ignition circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, refer to Power Mode Mismatch .
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF remove the test lamp
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
    • If the test lamp illuminates 
  5. Replace the control module setting the DTC.
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