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DTC B2602, DRL Relay Output Short To Ground/Open

  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. Replace DRL relay with a known good relay. DRL relay is located in underhood bussed electrical center. If DRL system operates properly, go to step 10). If DRL system does not operate properly, go to next step.
  3. Remove DRL relay from underhood bussed electrical center. Back out underhood bussed electrical center 68-pin, Brown connector C3, terminal B12 (Light Green/Black wire). Using DVOM, check resistance between underhood bussed electrical center connector C3, terminal B12 (Light Green/Black wire) and ground. If resistance is infinite, go to next step. If resistance is not infinite, go to step 5).
  4. Check for open in Light Green/Black wire between BFC connector C1 and underhood bussed electrical center connector C3. Repair as necessary. Go to step 11). If circuit is okay, replace underhood bussed electrical center. Go to step 10).
  5. Disconnect BFC 16-pin connector C1. Using DVOM, check resistance between BFC harness connector C1, terminal B5 (Light Green/Black wire) and ground. If resistance is infinite, go to step 7). If resistance is not infinite, go to next step.
  6. Repair short to ground in Light Green/Black wire between BFC connector C1 and underhood bussed electrical center connector C3. Go to step 10).
  7. Using DVOM, check resistance between BFC harness connector C1, terminal B5 (Light Green/Black wire) and underhood bussed electrical center connector C3, terminal B12 (Light Green/Black wire). If resistance is 0-2 ohms, go to step 9). If resistance is not 0-2 ohms, go to next step.
  8. Repair open in Light Green/Black wire between BFC connector C1 and underhood bussed electrical center connector C3. Go to step 11).
  9. Replace BFC. See REMOVAL & INSTALLATION  . Go to next step.
  10. Clear DTCs. Perform BFC DIAGNOSTIC SYSTEM CHECK  .
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