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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Illumination Lights >> Lighting >> Diagnostic Information and Procedures >> Headlamps Malfunction >> Circuit/System Verification

Circuit/System Verification

  1. Ignition ON, observe the scan tool Headlamp Switch parameter while cycling the headlamp switch between the auto and headlamp position. The parameter should cycle between Active and Inactive.
    • If the parameter does not cycle between the specified values, refer to Circuit/System Testing For Headlamp Switch Circuit Test.
  2. Observe the headlamps while cycling the headlamp switch between the auto and headlamp position. The low beam headlamps should turn on and off.
    • If 1 or both of the low beam headlamps do not turn on and off, refer to Circuit/System Testing For Low Beam Headlamp Circuit Test.
  3. Low beam headlamps ON, observe the scan tool High Beam Select Switch parameter while switching the high/low beam select switch between the low and high beam positions. The parameter should cycle between Active and Inactive.
    • If the parameter does not cycle between the specified values, refer to Circuit/System Testing  For High/Low Beam Select Switch Circuit Test.
  4. Connect a test lamp between the relay side of a high beam headlamp fuse and ground.
  5. Verify that the test lamp turns on and off while switching the high/low beam select switch between the low and high beam positions.
    • If the test lamp does not turn on and off while changing between the commanded states, refer to Circuit/System Testing  For High Beam Relay Control Circuit Test
  6. If 1 or both of the high beam headlamps do not turn on and off, refer to Circuit/System Testing  For High Beam Headlamp or Solenoid Circuit Test.
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