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Home >> Chevrolet >> 2015 >> Spark EV >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Electric Converters and Controllers >> Hybrid/EV Control System >> Diagnostic Information and Procedures >> DTC P2537: Ignition Accessory Switch Circuit (Hybrid Powertrain Control Module 1) >> Circuit/System Testing
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Circuit/System Testing

  1. Vehicle OFF, disconnect the X2 harness connector at the K114A hybrid powertrain control module 1.
  2. Vehicle ON.
  3. Verify a test lamp illuminates between the ignition circuit terminal 19 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Vehicle OFF.
    2. Test for less than 2 Ω in the ignition 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 OK and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Vehicle OFF.
    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 infinite resistance, replace the T6 power inverter module 1.
    • If the test lamp illuminates 
  4. All OK.
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