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Low Beam Headlights Will Not Turn On

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.

Possible Causes:

Testing

  1. Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn low beams on. Using scan tool, read HEADLIGHT SWITCH voltage. If voltage is 1.4-1.8 volts, go to next step. If voltage is not 1.4-1.8 volts, replace headlight switch. See REMOVAL & INSTALLATION in ANALOG INSTRUMENT PANELS article.
  2. Locate low beam relay in junction block. See Figure and Figure . Using scan tool, actuate low beam relay. If low beam relay clicks, go to next step. If low beam relay does not click, go to step  5 .
  3. Ensure ignition is off. Remove low beam relay from junction block. Measure voltage on low beam relay connector terminal No. 62, fused B+ circuit. If voltage is more than 10 volts, leave low beam relay removed and go to next step. If voltage is 10 volts or less, replace junction block. See JUNCTION BLOCK  under REMOVAL & INSTALLATION.
  4. Ensure fuses No. 10 (10-amp) and No. 12 (10-amp) in junction block are okay. Using a fused jumper wire, connect low beam relay connector terminal No. 62, fused B+ circuit and No. 63, low beam relay output circuit. If low beams illuminate, replace low beam relay. If low beams do not illuminate, repair open in low beam relay output circuit between junction block and headlights.
  5. Turn ignition off. Remove low beam relay from junction block. Measure voltage on low beam relay connector terminal No. 61, fused B+ circuit. If voltage is more than 10 volts, leave low beam relay removed and go to next step. If voltage is 10 volts or less, install low beam relay and go to step  8 .
  6. Connect a 12-volt test light between low beam relay connector terminal No. 60, low beam relay control circuit and No. 61, fused B+ circuit. Using scan tool, actuate low beam relay. If test light flashes, replace low beam relay. If test light does not flash, leave low beam relay removed and go to next step.
  7. Ensure ignition is off. Remove Body Control Module (BCM) from back of junction block. Measure resistance between low beam relay connector terminal No. 60 and terminal No. 14 at BCM connector on back of junction block. See Figure and Figure . If resistance is less than 5 ohms, replace BCM. See BODY CONTROL MODULE  under REMOVAL & INSTALLATION. If resistance is 5 ohms or more, replace junction block. See JUNCTION BLOCK  under REMOVAL & INSTALLATION.
  8. Remove and inspect fuse "D" (40-amp) in power distribution center. See Figure . If fuse is open, leave fuse removed and go to next step. If fuse is okay, repair open in fused B+ circuit (Light Blue/Red wire) between junction block and power distribution center.
  9. Measure resistance between ground and fuse "D" connector B+ circuit (Light Blue/Red wire). If resistance is less than 100 ohms, repair short to ground in Light Blue/Red wire. If resistance is 100 ohms or more, replace fuse and repeat this test. If test passes, fault may be intermittent. Check related wiring and connectors for poor connections or damage to wiring harness. See WIRING DIAGRAMS  . Repair any problems found as necessary and replace fuse. If no problems are found, check if any Technical Service Bulletins (TSBs) apply to vehicle. If no TSBs apply, test is complete.
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