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Test P: Left Turn Signal Indicator Inoperative

  1. Turn ignition switch to ON position. Operate left turn signal. If left turn signal operates correctly, go to next step. If left turn signal does not operate correctly, repair exterior lights concern. See EXTERIOR LIGHTS in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
  2. Remove instrument cluster to gain access to instrument cluster harness connectors. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster harness connector C220a. Ensure ignition switch is ON position. Place multifunction switch in left turn signal position. Measure voltage between ground and instrument cluster harness connector C220a terminal No. 5 (Light Green/White wire). See Figure. If voltage fluctuates between zero and 10 volts, go to step  4. If voltage does not fluctuate between zero and 10 volts, go to next step.
  3. Turn ignition switch to LOCK position. Disconnect multifunction switch harness connector C202b. Measure resistance in Light Green/White wire between instrument cluster harness connector C220a terminal No. 5 and multifunction switch harness connector C202b terminal No. 10. See Figure and Figure . Resistance should be less than 5 ohms. Measure resistance between ground and instrument cluster C220a terminal No. 5 (Light Green/White wire). Resistance should be greater than 10 k/ohms. If resistance is as specified, replace multifunction switch. See STEERING COLUMN SWITCHES - EXCURSION & F250-550 PICKUPS article. If resistance is not as specified, repair open or short to ground in Light Green/White wire and test system operation. See WIRING DIAGRAMS .
  4. Remove instrument cluster to gain access to instrument cluster harness connectors. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Disconnect instrument cluster harness connector C220c. Measure resistance between ground and instrument cluster harness connector C220c terminal No. 15 (Black wire). See Figure. If resistance is 5 ohms or less, go to next step. If resistance is more than 5 ohms, repair open in Black wire between instrument cluster and ground point. Ground point is located behind left side of dash. See WIRING DIAGRAMS . Retest system operation.
  5. Turn ignition switch to LOCK position. Check for corrosion, pushed out pins and harness connectors that are not connected correctly. Repair any damage found and reconnect any loose harness connectors. Retest system operation. If problem does not exist, system is operating correctly at this time. Clear any DTCs. If problem exists, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Retest system operation.
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