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DTC B0502: RH DRL Relay Circuit (Open Or Short To Ground): Testing

  1. If BCM diagnostic system check was performed, go to next step. If BCM diagnostic system check was not performed, go to BCM DIAGNOSTIC SYSTEM CHECK  .
  2. Turn ignition off. Disconnect RH DRL relay from instrument panel electrical center. Turn ignition on. Using a test light connected to ground, probe RH DRL relay BATT terminals at instrument panel electrical center. See Figure . If test light illuminates, go to next step. If test light does not illuminate, go to step 13).
  3. Turn ignition off. Using a test light connected to battery, probe RH DRL relay CKT 1915 terminal at instrument panel electrical center. See Figure . If test light illuminates, go to step 10). If test light does not illuminate, go to next step.
  4. Using DVOM, check resistance between RH DRL relay terminals No. 85 and 86. If resistance is 75-105 ohms, go to next step. If resistance is not 75-105 ohms, go to step 12).
  5. Check for continuity between RH DRL relay terminals No. 85 and 30. If continuity exists, go to step 12). If continuity does not exist, go to next step.
  6. Turn ignition on. Using a test light connected to battery, probe RH DRL relay CKT 1915 terminal at instrument panel electrical center. See Figure . Using scan tool, command RH DRL relay on and off. If test light toggles on and off as commanded, go to step 8). If test light does not toggle on and off as commanded, go to next step.
  7. Turn ignition off. Disconnect BCM connector C2. Using DVOM, check for continuity between BCM harness connector C2 terminal D16 (Orange wire) and RH DRL relay CKT 1915 terminal at instrument panel electrical center. See Figure . If continuity exists, go to step 15). If continuity does not exist, go to step 14).
  8. Check for intermittent in RH DRL circuit. See DIAGNOSTIC AIDS. If no problem is found, go to next step. If problem is found, repair as necessary. Go to step 16).
  9. Ensure ignition is off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Using scan tool, cycle RH DRL relay. If DTC B0502 is current, go to step 15). If DTC B0502 is not current, system is operating properly.
  10. Ensure ignition is off. Disconnect BCM connector C2. Using a test light connected to battery, probe RH DRL relay CKT 1915 terminal at instrument panel electrical center. See Figure . If test light illuminates, go to next step. If test light does not illuminate, go to step 15).
  11. Repair short to ground in instrument panel electrical center or in circuit No. 1915 (Orange wire) between BCM and RH DRL relay. Go to step 16).
  12. Replace RH DRL relay. Go to step 16).
  13. Repair open in ignition feed circuit to instrument panel electrical center. See appropriate wiring diagram in POWER DISTRIBUTION article in WIRING DIAGRAMS. If a fuse is open, repair short in appropriate circuit. Go to step 16).
  14. Repair open in instrument panel electrical center or in circuit No. 1915 (Orange wire) between BCM and RH DRL relay. Go to step 16).
  15. Replace BCM. See REMOVAL & INSTALLATION  . Reprogram BCM. See BCM PROGRAMMING/RPO CONFIGURATION  . Go to next step.
  16. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Perform BCM DIAGNOSTIC SYSTEM CHECK  .
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