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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1138 (Lighting Systems) >> Diagnostic Information and Procedures >> Adaptive Forward Lighting Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the appropriate headlamp actuator.
  2. Ignition OFF, test for less than 10.0 ohms between the motor control circuit terminal 1 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the headlamp control module.
  3. Ignition OFF, test for less than 10.0 ohms between the motor control circuit terminal 2 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the headlamp control module.
  4. Ignition OFF, test for less than 10.0 ohms between the motor control circuit terminal 3 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the headlamp control module.
  5. Ignition OFF, test for less than 10.0 ohms between the motor control circuit terminal 4 and ground.
    • If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the headlamp control module.
  6. Connect a test lamp between control circuit terminal 1 and control circuit terminal 3.
  7. Command the AFL motor control to the LEFT and RIGHT positions with a scan tool. The test lamp should turn ON when commanding the LEFT and RIGHT states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the headlamp control module.
  8. Connect a test lamp between control circuit terminal 2 and control circuit terminal 4.
  9. Command the AFL motor control to the LEFT and RIGHT positions with a scan tool. The test lamp should turn ON when commanding the LEFT and RIGHT states.
    • If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the headlamp control module.
  10. If all circuits test normal, replace the appropriate headlamp assembly.
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