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Home >> Cadillac >> 2021 >> CT4 Sport, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Vehicle Access System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B115E or B115F >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S13D Door Lock Switch-Driver.
  2. Verify a test lamp illuminates between ground circuit terminal 4 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 2150 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify the scan tool Left Front Door Interior Lock Status parameter is Inactive
    • If not Inactive 
    1. Test the circuit 2771 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the S79D Front Side Door Window Control Switch-Driver.
    • Go to next step: If Inactive 
  5. Install a 3 A fused jumper wire between the signal circuit terminal 2 and ground.
  6. Verify the scan tool parameter is now Active.
    • If not Active and the 3 A fuse is OK 
    1. Test the circuit 2771 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the S79D Front Side Door Window Control Switch-Driver.
    • If not Active and the 3 A fuse is open 
    1. Test the circuit 2771 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the S79D Front Side Door Window Control Switch-Driver.
    • Go to next step: If Active 
  7. Verify the scan tool Left Front Door Interior Unlock Status parameter is Inactive
    • If not Inactive 
    1. Test the circuit 2772 for a short to ground
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the S79D Front Side Door Window Control Switch-Driver.
    • Go to next step: If Inactive 
  8. Install a 3 A fused jumper wire between the signal circuit terminal 3 and ground.
  9. Verify the scan tool parameter is now Active.
    • If not Active and the 3 A fuse is OK 
    1. Test the circuit 2772 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the S79D Front Side Door Window Control Switch-Driver.
    • If not Active and the 3 A fuse is open 
    1. Test the circuit 2772 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the S79D Front Side Door Window Control Switch-Driver.
    • Go to next step: If Active 
  10. Replace the S13D Door Lock Switch-Driver.
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