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DTC B0432: Rear Defogger 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 rear defogger relay from instrument panel electrical center. Turn ignition on. Using a test light connected to ground, probe rear defogger 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 14).
  3. Turn ignition off. Using a test light connected to battery, probe rear defogger relay CKT 193 terminal at instrument panel electrical center. See Figure . If test light illuminates, go to step 11). If test light does not illuminate, go to next step.
  4. Using DVOM, check resistance between rear defogger 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 13).
  5. Check for continuity between rear defogger relay terminals No. 85 and 87. If continuity exists, go to step 13). If continuity does not exist, go to next step.
  6. Check for continuity between rear defogger relay terminals No. 85 and 30. If continuity exists, go to step 13). If continuity does not exist, go to next step.
  7. Turn ignition on. Using a test light connected to battery, probe rear defogger relay CKT 193 terminal at instrument panel electrical center. See Figure . Using scan tool, command rear defogger relay on and off. If test light toggles on and off as commanded, go to step 9). If test light does not toggle on and off as commanded, go to next step.
  8. Check for an open in instrument panel electrical center or in circuit No. 193 (White wire) between BCM and rear defogger relay. If no problem is found, go to step 10). If problem is found, repair as necessary. Go to step 16).
  9. Check for intermittent in rear defogger circuit. See DIAGNOSTIC AIDS. If no problem is found, go to next step. If problem is found, repair as necessary. Go to step 16).
  10. Turn ignition off. Reinstall all components and connectors. Turn ignition on. Clear DTCs. Using scan tool, cycle rear defogger relay. If DTC B0432 is current, go to step 15). If DTC B0432 is not current, system is operating properly.
  11. Ensure ignition is off. Disconnect BCM connector C2. Using a test light connected to battery, probe rear defogger relay CKT 193 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).
  12. Repair short to ground in instrument panel electrical center or in circuit No. 193 (White wire) between BCM and rear defogger relay. Go to step 16).
  13. Replace rear defogger relay. Go to step 16).
  14. 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).
  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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