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HOMESERVICE MANUALSISUZU2006ASCENDER S, 5.3 M, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 525 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESHEADLAMP SWITCH ON INDICATOR INOPERATIVECIRCUIT/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.
  1. Ignition OFF, disconnect the harness connectors at the headlamp switch.
  2. Ignition ON, headlamps ON, verify that a test lamp illuminates between the LED dimming control circuit terminal K X1 and ground.
  3. Connect a test lamp between the LED dimming control circuit terminal K X1 and the headlamp on indicator control circuit terminal L X1.
    • If the test lamp does not illuminate, test the LED dimming control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between headlamp on switch signal circuit terminal D X1 and the ground circuit terminal C X1. The test lamp should illuminate.
    • If the test lamp is always OFF, test the headlamp ON indicator control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the headlamp switch.
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