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DTC B2578, ALC Headlight Relay Output Short To Battery

  1. If BFC diagnostic system check was performed, go to next step. If BFC diagnostic system check was not performed, go to BFC DIAGNOSTIC SYSTEM CHECK  .
  2. Using scan tool, activate ALC headlight relay. If ALC headlight relay activates, go to step 11). If ALC headlight relay does not activate, go to next step.
  3. Replace ALC headlight relay with a known good relay. ALC headlight relay is located in underhood bussed electrical center. If ALC headlight relay activates, go to step 11). If ALC headlight relay does not activate, go to next step.
  4. Disconnect ALC headlight relay from underhood bussed electrical center. Back out underhood bussed electrical center 68-pin Brown connector C3, terminal C11 (Pink/White wire). Using DVOM, check voltage between underhood bussed electrical center connector C3, terminal C11 (Pink/White wire) and ground. If greater than zero volts exists, go to next step. If greater than zero volts does not exist, go to step 6).
  5. Replace underhood bussed electrical center. Go to step 11).
  6. Disconnect BFC 16-pin connector C1. Using DVOM, check resistance between BFC harness connector C1, terminal A1 (Pink/White wire) and ground. If greater than zero volts exists, go to step 9). If greater than zero volts does not exist, go to next step.
  7. Check for a poor connection at BFC connector C1, terminal A1 (Pink/White wire). If a poor connection exists, go to next step. If connection is okay, go to step 10).
  8. Repair poor connection at BFC connector C1, terminal A1 (Pink/White wire). Go to step 11).
  9. Repair short to battery in Pink/White wire between BFC connector C1 and underhood bussed electrical center connector C3. Go to step 11).
  10. Replace BFC. See REMOVAL & INSTALLATION  . Go to next step.
  11. Clear DTCs. Perform BFC DIAGNOSTIC SYSTEM CHECK  .
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