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Circuit/System Testing

WARNING: This page is about a different car, the 2010 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the front headlamp leveling sensor arm from the ball and socket.
  2. Ignition ON, headlamps ON, observe the appropriate scan tool Headlamp Control Module Motor Position Status parameter while moving the front headlamp leveling sensor arm up and down. The reading should change as the arm is moved.
    • If the reading does not change, replace the front headlamp leveling sensor.
  3. Connect the front headlamp leveling sensor arm to the ball and socket.
  4. Ignition OFF, disconnect the rear headlamp leveling sensor arm from the ball and socket.
  5. Ignition ON, headlamps ON, observe the appropriate scan tool Headlamp Control Module Motor Position Status parameter while moving the rear headlamp leveling sensor arm up and down. The reading should change as the arm is moved.
    • If the reading does not change, replace the rear headlamp leveling sensor.
  6. If all circuits test normal, replace the headlamp control module.
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