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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 224 (Lighting System - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC B11D1 or B11D2 >> 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.

DTC B11D1

  1. Ignition/vehicle OFF, disconnect the appropriate component:
    • {With T87} E2RF Front Side Marker Lamp - Right
    • {Without T87} E13RA Front Headlamp - Right
  2. Verify a test lamp illuminates between the appropriate ground circuit terminal and B+:
    • {With T87} E2RF Front Side Marker Lamp - Right = Terminal 1
    • {Without T87} E13RA Front Headlamp - Right = Terminals 1 and 4
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on the ground circuit or ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Connect a test lamp between the appropriate control circuit terminal and ground, ignition on/vehicle in service mode:
    • {With T87} E2RF Front Side Marker Lamp - Right = Terminal 2
    • {Without T87} E13RA Front Headlamp - Right = Terminal 6
  4. Verify the test lamp turns on and off when commanding the park lamps on and off with the S78 Turn Signal Switch.
    • If the test lamp is always off 
    1. Test control circuit 1253 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 control circuit 1253 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 K219 Lighting Control Module.
    • If the test lamp is always on 
    1. Test control circuit 1253 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 K219 Lighting Control Module.
    • Go to next step: If the test lamp turns on and off 
  5. Replace the appropriate lamp assembly.

DTC B11D2

  1. Ignition/vehicle OFF, disconnect the appropriate component:
    • {With T87} E2LF Front Side Marker Lamp - Left
    • {Without T87} E13LA Front Headlamp - Left
  2. Verify a test lamp illuminates between the appropriate ground circuit terminal and B+:
    • {With T87} E2LF Front Side Marker Lamp - Left = Terminal 1
    • {Without T87} E13LA Front Headlamp - Left = Terminals 1 and 4
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on the ground circuit or ground connection.
    • Go to next step: If the test lamp illuminates 
  3. Connect a test lamp between the appropriate control circuit terminal and ground, ignition on/vehicle in service mode:
    • {With T87} E2LF Front Side Marker Lamp - Left = Terminal 2
    • {Without T87} E13LA Front Headlamp - Left = Terminal 6
  4. Verify the test lamp turns on and off when commanding the park lamps on and off with the S78 Turn Signal Switch.
    • If the test lamp is always off 
    1. Test control circuit 1254 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 control circuit 1254 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 K219 Lighting Control Module.
    • If the test lamp is always on 
    1. Test control circuit 1254 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 K219 Lighting Control Module.
    • Go to next step: If the test lamp turns on and off 
  5. Replace the appropriate lamp assembly.
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