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Both Headlight Doors Always Open

  1. Check headlight system operation. If headlights operate properly, go to next step. If headlights do not operate properly, locate and repair problem in headlight system. See HEADLIGHT SYSTEMS & DAYTIME RUNNING LIGHTS article.
  2. Connect scan tool. Turn headlights on, then off while monitoring scan tool BCM input display. If headlight off switch input is inactive, then active, go to next step. If display is not as specified, go to step  5 .
  3. Disconnect HDM harness connector C1. Check resistance between Headlight Doors Module (HDM) harness connector C1 terminal "D" (Black wire) and ground. See Fig 1 . If resistance is 2 ohms or less, go to next step. If resistance is more than 2 ohms, repair open in Black wire between HDM connector C1 and splice pack No. 100. See WIRING DIAGRAMS  . Recheck system operation.
  4. Connect a test light between HDM harness connector C1 terminal "C" (Dark Green wire) and ground. Turn headlight switch off. If test light illuminates, go to ONE HEADLIGHT DOOR STAYS OPEN OR CLOSED  test. If test light does not illuminate, repair poor connection or open in Dark Green wire circuit 306. See WIRING DIAGRAMS  .
  5. Disconnect headlight switch harness connector C209. Using DVOM, check resistance between switch side harness connector C209 terminals No. 2 (Orange wire) and "T" (Dark Green wire). Turn headlight switch off. If resistance is 2 ohms or less, go to next step. If resistance is more than 2 ohms, replace headlight switch. Recheck system operation.
  6. Repair open in Dark Green wire between underhood electrical center connector C2 and connector C209. See WIRING DIAGRAMS  .
Fig 1: Identifying Headlight Doors Module Connector Terminals
G98I01739Courtesy of GENERAL MOTORS CORP.
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