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HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 525 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESHEADLAMP LEVELING MALFUNCTIONCIRCUIT/SYSTEM TESTING
2006 Isuzu Ascender S, 5.3 M, 4WD

Circuit/System Testing

2006 Isuzu Ascender S, 5.3 M, 4WDSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Envoy and 2009 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Headlamp Leveling Actuator Malfunction

  1. Ignition OFF, disconnect the harness connectors at the headlamp switch.
  2. Test for less than 5.0 ohms between the ground circuit terminal C X1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the headlamp switch ignition circuit terminal G X2 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Reconnect the harness connectors at the headlamp switch.
  5. Disconnect the harness connector at the inoperative headlamp leveling actuator.
  6. Test for less than 5.0 ohms between the ground circuit terminal 1 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Ignition ON, verify that a test lamp illuminates between the headlamp leveling actuator ignition circuit terminal 3 and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  8. Ignition ON, test for 2.0 - 8.0 volts between the headlamp leveling actuator signal circuit terminal 2 and ground while operating the leveling switch from the lowest to highest setting.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the headlamp switch.
    • If greater than the specified range, test the signal circuit for a short to voltage. if the circuit tests normal, replace the headlamp switch.
  9. If all circuits test normal, test or replace the inoperative headlamp leveling actuator.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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