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Test Ac: Turn Signal Indicators And/Or Lights Inoperative

NOTE: Turn signal switch is also referred to as multifunction switch.
  1. If lighting system diagnostic system check has been performed, go to next step. If lighting system diagnostic system check has not been performed, see LIGHTING SYSTEM DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article. After performing lighting system diagnostic system check, go to next step.
  2. Turn ignition on. Place turn signal lever in left and right turn signal positions while monitoring IPC turn signal indicators and exterior lights. If IPC turn signal indicators and exterior lights flash, problem may be intermittent. To diagnose intermittent, go to INTERMITTENT TROUBLE CODE DETERMINATION in BODY CONTROL MODULES - CORVETTE article. If IPC turn signal indicators and exterior lights do not flash, go to next step.
  3. If only IPC turn signal indicators are inoperative, go to step  5 . If not only IPC turn signal indicators are inoperative, go to next step.
  4. If all exterior lights are inoperative, go to step  6 . If not all exterior lights are inoperative, go to step  13 .
  5. Ensure turn signal lever is at inoperative position. Using test light connected to ground, backprobe IPC connector terminal for inoperative indicator. For left turn signal indicator, probe IPC connector terminal A15 (Light Blue wire). For right turn signal indicator, probe IPC connector terminal A16 (Dark Blue wire). See Figure . If test light flashes, go to step  8 . If test light does not flash, go to step  11 .
  6. Locate and disconnect 10-pin connector C215. C215 is located behind hazard warning switch. Using a test light connected to ground, probe connector C215 terminal "C" (Pink wire). Turn ignition on. If test light illuminates, go to next step. If test light does not illuminate, go to step  12 .
  7. Turn ignition off. Using a test light, probe between C215 terminals "C" (Pink wire) and "H" (Purple wire). Turn ignition on. If test light illuminates, go to step  9 . If test light does not illuminate, go to step  10 .
  8. Check for poor connections at IPC. Repair as necessary. After repairs, go to step  17 . If connections are okay, go to step  14 .
  9. Check for poor connections at hazard warning switch. Repair as necessary. After repairs, go to step  17 . If connections are okay, go to step  15 .
  10. Check for poor connections at turn signal switch. Repair as necessary. After repairs, go to step  17 . If connections are okay, go to step  16 .
  11. Repair open or high resistance in Light Blue or Dark Blue wire. After repairs, go to step  17 .
  12. Repair open or high resistance in battery positive voltage feed circuit to HAZT/SG fuse No. 15 (20-amp) located in instrument panel fuse block. After repairs, go to step  17 .
  13. Repair open or high resistance in inoperative turn signal light power supply or ground circuit. See appropriate wiring diagram in EXTERIOR LIGHTS article. After repairs, go to step  17 .
  14. Replace IPC. See INSTRUMENT PANEL CLUSTER  under REMOVAL & INSTALLATION. After repairs, go to step  17 .
  15. Replace hazard warning switch. After repairs, go to step  17 .
  16. Replace turn signal switch. See MULTIFUNCTION SWITCH under REMOVAL & INSTALLATION in STEERING COLUMN SWITCHES - CORVETTE article. After repairs, go to next step.
  17. Recheck system operation to verify the repair. If system operates properly, repair is complete. If system does not operate properly, go to step  3 .
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