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Fog Light Indicator Inoperative

WARNING: This page is about a different car, the 2000 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit identification, see EXTERIOR LIGHTS article.
  1. If Body Control Module (BCM) diagnostic system check has been performed, go to next step. If BCM diagnostic system check has not been performed, see BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article.
  2. Disconnect fog light switch connector. Remove FOG LP MiniFuse(R) No. 6 (10-amp) located in underhood fuse block. Check for open or high resistance in Purple wire between FOG LP fuse and fog light switch connector terminal No. 5. If circuit is okay, go to next step. If faulty circuit is found and repaired, go to step  7 .
  3. Disconnect Body Control module (BCM) connector C3. BCM is located under passenger's floor board. See Figure . Check for open or high resistance in Yellow wire between BCM connector C3 terminal B4 and fog light switch connector terminal No. 5. See Fig 1 . If circuit is okay, go to next step. If faulty circuit is found and repaired, go to step  7 .
  4. Connect fog light switch connector. Install FOG LP MiniFuse(R) No. 6 (10-amp) in underhood fuse block. Using DVOM, backprobe and measure voltage between fog light switch connector terminals No. 3 (Yellow wire) and No. 5 (Purple wire). Turn parking lights and fog lights on. If battery voltage is indicated, go to next step. If battery voltage is not indicated, go to step  6 .
  5. Replace fog light/release switch. See FOGLIGHT/REAR HATCH SWITCH  under REMOVAL & INSTALLATION. After repairs, go to step  7 .
  6. Replace Body Control Module (BCM). See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION. After repairs, go to next step.
  7. Clear any DTCs. Recheck system operation. If symptom still exists, go to BODY CONTROL MODULE DIAGNOSTIC SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in BODY CONTROL MODULES - CORVETTE article.
Fig 1: Identifying BCM Connector Terminals (C1, C2 & C3)
G99G08607Courtesy of GENERAL MOTORS CORP.
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