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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 312 (Wiring Systems And Power Management - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2534 or P2535 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT5. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:
    • If there is an open fuse that supplies an input voltage to the BCM the DTC P2534 may set.
    • If an open fuse that supplies voltage to the BCM is found it is likely to be caused by a short to ground on an output circuits from the BCM and is not likely to be the module itself. Do not replace the module before isolating all output circuits first.
    • Use the schematics to verify the items listed below:
      • The control module's Fuses, Relays, B+ supply voltages, ignition voltages, and ground circuits.
      • The control module terminal numbers.
  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 1 V or greater 
    1. Verify the KR73 Ignition Main Relay Coil Control circuit 5199 is not shorted to voltage.
      • If a short to voltage is found repair the short to voltage
      • Go to next step: If a short to voltage is not found
  3. Repair the Short to voltage on the ignition circuit.
    • Go to next step: If less than 1 V 
  4. Ignition ON vehicle in Run or Propulsion mode.
  5. Verify a test lamp illuminates between the appropriate module 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 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, 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.
      • Go to next step: If Infinite Resistance
    3. Replace the appropriate control module.
    • Go to next step: If the test lamp illuminates 
  6. Replace the appropriate control module setting the DTC.
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