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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 345 (Power Door Lock System - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC B17F6 >> 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.
  1. Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the A23LR Rear Side Door Latch-Left.
  2. Verify a test lamp illuminates between ground circuit terminal 7 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 2350 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Ignition ON, Vehicle in Service Mode
  4. Test for greater than 7 V between the signal circuit terminal 8 and ground
    • If 7 V or less 
    1. Test circuit 6653 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. Test circuit 6653 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.
    3. Replace the K9 Body Control Module.
    • Go to next step: If greater than 7 V 
  5. Test or replace the A23LR Rear Side Door Latch-Left.
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