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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1904 (Lighting System) >> Diagnostic Information and Procedures >> Turn Signal Lamps and/or Indicators Malfunction >> Circuit/System Testing >> Turn Signal Lamps Malfunction

Turn Signal Lamps Malfunction

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X4 harness connector at the BCM.
  2. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, connect the X4 harness connector at the BCM.
  5. Disconnect the harness connector at the inoperative turn signal lamp.
  6. Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the appropriate ground circuit terminal listed below and ground.
    • Left front turn signal ground terminal 1
    • Right front turn signal ground terminal 1
    • Left rear turn signal ground terminal B
    • Right rear turn signal ground terminal B
    • Left repeater ground terminal B
    • Right repeater ground terminal B
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Connect a test lamp between the appropriate control circuit terminal listed below and ground.
    • Left front turn signal control terminal 3
    • Right front turn signal control terminal 3
    • Left rear turn signal control terminal H
    • Right rear turn signal control terminal H
    • Left repeater control terminal A
    • Right repeater control terminal A
  8. Command the appropriate Turn Signal Lamp 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 voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  9. If all circuits test normal, replace the appropriate turn signal lamp assembly.
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