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Headlights Will Not Turn On

  1. Turn headlights on. If both headlights do not illuminate, go to step  3 . If only one headlight illuminates, inspect fuse No. 8 for left headlight or fuse No. 9 for right headlight in Power Distribution Center (PDC). PDC is located in engine compartment, next to battery. If fuse is blown, check for cause of fuse to blow and repair wiring as necessary. See appropriate wiring diagram in DAYTIME RUNNING LIGHTS and/or HEADLIGHT SYSTEMS article. Replace fuse. If fuse is okay, go to next step.
  2. Reinstall fuse. Disconnect inoperative headlight connector. Turn headlight switch on. Measure voltage between ground and terminal No. 1 (Violet wire for left headlight or Violet/Red wire for right headlight) at headlight harness connector. If voltage is more than 10 volts, no problem is indicated. Replace faulty headlight. If voltage is 10 volts or less, repair open in Violet or Violet/Red wire.
  3. Turn ignition on. Using scan tool, actuate headlight relay. If headlights do not illuminate, go to step  8 . If headlights illuminate, go to next step.
  4. Stop headlight actuation. Turn headlights on. Using scan tool, read HEADLAMP SWITCH SENSE. If scan tool displays HEADLAMP SWITCH: CLOSED, replace Body Control Module (BCM). BCM is located with junction block under driver's side instrument panel. See Figure . If scan tool does not display HEADLAMP SWITCH: CLOSED, go to next step.
  5. Turn ignition off. Access BCM connector "A". Remove connector cover. Do not disconnect connector. Connect one end of a jumper wire to ground. Using other end of jumper wire, backprobe terminal No. 13 (Light Green/Orange wire) at BCM connector "A". See Figure . Turn ignition on. Using scan tool, read HEADLAMP SWITCH SENSE. If scan tool displays HEADLAMP SWITCH: CLOSED, go to next step. If scan tool does not display HEADLAMP SWITCH: CLOSED, replace BCM.
  6. Turn ignition off. Disconnect headlight switch connectors. Connect a jumper wire between ground and terminal No. 3 (Light Green/Orange wire) at headlight switch 8-pin connector. See Figure . Turn ignition on. Using scan tool, read HEADLAMP SWITCH SENSE. If scan tool displays HEADLAMP SWITCH: CLOSED, go to next step. If scan tool does not display HEADLAMP SWITCH: CLOSED, repair open in Light Green/Orange wire.
  7. Disconnect jumper wire. Measure resistance between ground and terminal No. 2 (Black wire) at headlight switch 8-pin connector. If resistance is less than 5 ohms, replace headlight switch. If resistance is 5 ohms or more, repair open in Black wire.
  8. Stop headlight relay actuation. Remove and inspect fuse No. 8 for left headlight and fuse No. 9 for right headlight in Power Distribution Center (PDC). If fuse(s) is blown, check for cause of fuse to blow and repair wiring as necessary. See appropriate wiring diagram in DAYTIME RUNNING LIGHTS and/or HEADLIGHT SYSTEMS article. Replace fuse(s). If both fuses are okay, go to next step.
  9. Reinstall fuses. Remove low beam relay from PDC. See Figure . Measure voltage between ground and terminal No. 86 (Red wire) at low beam relay socket in PDC. See Figure . If voltage is 10 volts or less, replace PDC. If voltage is more than 10 volts, go to next step.
  10. Measure voltage between ground and terminal No. 30 (Red wire) at low beam relay socket in PDC. If voltage is 10 volts or less, replace PDC. If voltage is more than 10 volts, go to next step.
  11. Connect a jumper wire between terminals No. 86 and 87 at low beam relay socket in PDC. If headlights do not illuminate, leave jumper wire connected and go to step  18 . If headlights illuminate, go to next step.
  12. Remove jumper wire. Install low beam headlight relay. If vehicle is equipped with quad headlights, go to next step. If vehicle is not equipped with quad headlights, go to step  15 .
  13. Disconnect BCM connector "B". Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, connect a jumper wire between ground and terminal No. 76 (Orange/White wire) at BCM connector "B". See Figure . If headlights illuminate, replace BCM. If headlights do not illuminate, leave jumper wire connected and go to next step.
  14. Remove low beam relay. See Figure . Measure resistance between ground and terminal No. 85 (Orange/White wire) at low beam relay socket in PDC. If resistance is less than 5 ohms, replace low beam relay. If resistance is 5 ohms or more, repair open in Orange/White wire between BCM and PDC.
  15. Remove lower steering column cover. Disconnect multifunction switch connector. See Figure . Connect a jumper wire between ground and terminal No. 10 (Orange/White wire) at multifunction switch connector. See Figure . If headlights illuminate, go to next step. If headlights do not illuminate, go to step  17 .
  16. Remove jumper wire. Reconnect jumper wire between ground and terminal No. 9 (Pink wire) at multifunction switch connector. Access junction block connector C3. See Figure . Using scan tool in ohmmeter mode, probe terminal No. 33 at junction block connector C3. See Figure . If resistance is less than 5 ohms, replace multifunction switch. If resistance is 5 ohms or more, repair open in Pink wire (low beam relay control circuit) between junction block and multifunction switch.
  17. Remove low beam headlight relay from PDC. See Figure . Using scan tool in ohmmeter mode, measure resistance at terminal No. 85 (Orange/White wire) at low beam relay socket in PDC. If resistance is less than 5 ohms, replace low beam relay. If resistance is 5 ohms or more, repair open in Orange/White wire between multifunction switch and PDC.
  18. Remove one low beam headlight fuse (No. 8 or 9) from PDC. See Figure . Measure voltage between ground and battery input side of fuse holder for removed low beam headlight fuse in PDC. If voltage is less than 10 volts, replace PDC. If voltage is 10 volts or more, go to next step.
  19. Reinstall low beam headlight fuse. Disconnect one low beam headlight connector. Measure voltage between ground and Violet wire or Violet/Red wire (power circuit) at disconnected low beam headlight connector. If voltage is more than 10 volts, low beam headlight circuits are okay. Replace faulty headlight(s). If voltage is 10 volts or less, repair open in Violet or Violet/Red wire between low beam headlight fuse and headlight.
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