LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Hummer >> 2009 >> H3T Base, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting System >> Diagnostic Information and Procedures >> DTC B2575 >> Circuit/System Testing
October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Circuit/System Testing

  1. Ignition OFF, disconnect the HDLP relay.
  2. Connect a test lamp between the control circuit terminal 86 and the B+ circuit terminal 85.
  3. Ignition ON, command the low beam headlamps ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or open/high resistance. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, test or replace the HDLP relay.
scientia non olet · About LEMON Manuals