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Home › Chevrolet › 2013 › Traverse LS, AWD › Repair and Diagnosis › External Pages › Different car › Section 173 (Lighting System - Diagnostic Information And Procedures) › Diagnostic Information and Procedures › DTC B3415: Automatic Headlamp Leveling Control Module Axle Sensor › Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Cadillac SRX. 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 B51 headlamp leveling sensor, ignition ON.
  2. Verify a test lamp illuminates between the low reference circuit terminal 2 and B+.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the X2 harness connector at the K28 headlamp leveling control module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K28 headlamp leveling control module.
    • If the test lamp illuminates 
  3. Engine RUNNING.
  4. Test for 4.8-5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K28 headlamp leveling control module.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K28 headlamp leveling control module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K28 headlamp leveling control module, ignition ON.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K28 headlamp leveling control module.
    • If between 4.8-5.2 V 
  5. Verify the appropriate scan tool Leveling Position Sensor parameter is less than 1 V.
    • If 1 V or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K28 headlamp leveling control module, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal 3 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K28 headlamp leveling control module.
    • If less than 1 V 
  6. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the signal circuit terminal 3, engine RUNNING.
  7. Verify the appropriate scan tool Leveling Position Sensor parameter is greater than 4.8 V.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K28 headlamp leveling control module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K28 headlamp leveling control module.
    • If 4.8 V or greater 
  8. Test or replace the appropriate B51 headlamp leveling sensor.
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