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DTC B2558: Interior Light Control Output Short To Battery: Testing

  1. If body function controller (BFC) diagnostic system check has been performed, go to next step. If body function controller (BFC) diagnostic system check has not been performed, go toBODY FUNCTION CONTROLLER (BFC) DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
  2. Disconnect BFC Pink 24-pin connector C3. Remove left and right courtesy lights. Turn dome switch to OFF position. Using DVOM, measure voltage between BFC connector C3 terminal A11 (White wire) and ground. See Figure . If zero volts exists, go to step  10 . If zero volts does not exist, go to next step.
  3. Disconnect left I/P junction block Brown 68-pin connector C1. Disconnect left I/P junction block Gray 30-pin connector C2. Disconnect left I/P junction block Black 30-pin connector C3. Using DVOM, measure voltage between BFC connector C3 terminal A11 (White wire) and ground. If zero volts exists, go to step  5 . If zero volts does not exist, go to next step.
  4. Repair short to voltage in White wire between BFC and left I/P junction block. After repairs, go to step  11 .
  5. Using DVOM, measure voltage between left I/P junction block Gray 30-pin connector C2 terminal C3 (White wire) and ground. If zero volts exists, go to step  7 . If zero volts does not exist, go to next step.
  6. Repair short to voltage in White wire between left I/P junction block and left and right courtesy lights. After repairs, go to step  11 .
  7. Using DVOM, measure voltage between left I/P junction block Black 30-pin connector C3 terminal C10 (White wire) and ground. If zero volts exists, go to step  9 . If zero volts does not exist, go to next step.
  8. Repair short to voltage in White wire between left I/P junction block and dome light. After repairs, go to step  11 .
  9. Replace left I/P junction block. After repairs, go to step  11 .
  10. Replace BFC. See BODY FUNCTION CONTROLLER (BFC)  under REMOVAL & INSTALLATION. After repairs, go to next step.
  11. Reconnect all disconnected components and connectors. Clear DTCs. Perform BODY FUNCTION CONTROLLER (BFC) DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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