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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 B1B15 >> 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. Ignition OFF, disconnect the connector at the S38 On/Off Vehicle Switch.
    2. NOTE:

    If the S38 Vehicle On/Off Amber and/or Green indicators function this step does not need to be performed and you may proceed to the next step.

  2. Verify a test lamp illuminates between the low reference circuit terminal 3 and B+.
    • If the test lamp does not illuminate 

      Repair the open or high resistance on ground circuit 1351 or the ground connection.

    • Go to next step: If the test lamp illuminates 
  3. Connect the S38 On/Off Vehicle Switch.
  4. Ignition On Vehicle in Run mode.
  5. Disconnect the S38 On/Off Vehicle Switch.
  6. Test for between 4.7 V and 5.3 V between the signal circuit terminal 4 and ground.
    • If not the specified value 
      NOTE:

      It may be necessary to disconnect the K9 Body control Module and K56 Serial Data Gateway Module when diagnosing a short on control circuit 5723.

    1. Test the signal circuit 5723 for a short to ground condition.
      • If a short to ground condition is found, repair the short in the circuit.
      • Go to next step: If a short to ground condition is not found
    2. Test the signal circuit 5723 for an open/high resistance condition.
      • If an open/high resistance condition is found, repair the open/high resistance in the circuit.
      • Go to next step: If an open/high resistance condition is not found
    3. Test the signal circuit 5723 for less than 5.9 V.
      • If greater than 5.9 V, repair the short to voltage in the circuit.
      • Go to next step: If less than 5.9 V
    4. Replace the K9 Body Control Module.
    • Go to next step: If the Specified Value 
  7. Connect the S38 On/Off Vehicle Switch.
  8. Ignition Off Vehicle in Off power mode.
  9. Test for 6.0k-7.5K Ω between Signal terminal 4 and ground terminal 3 with the S38 On/Off Vehicle not pressed.
    • If not between 6.0k-7.5K Ω 

      Replace the S38 On/Off Vehicle Switch.

    • Go to next step: If between 6.0k-7.5K Ω 
  10. Test for 1.3k-1.8k Ω between Signal terminal 4 and ground terminal 3 with the S38 On/Off Vehicle Switch pressed.
    • If not between 1.3k-1.8k Ω 

      Replace the S38 On/Off Vehicle Switch.

    • Go to next step: If between 1.3k-1.8k Ω 
  11. Replace the K9 Body Control Module.
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