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Diagnostic Procedures

  1. Turn ignition off. Using DVOM connected to ground, backprobe DLC terminal No. 16 (Orange wire). See WIRING DIAGRAMS  . If voltage reading is 9-14 volts, go to next step. If voltage is not 9-14 volts, go to step 11).
  2. Using DVOM, check voltage between battery positive and DLC terminal No. 5 (Black wire). If voltage reading is 9-14 volts, go to next step. If voltage reading is not 9-14 volts, go to step 12).
  3. Check voltage between battery positive and DLC terminal No. 4 (Black wire). If voltage reading is 9-14 volts, go to next step. If voltage reading is not 9-14 volts, go to step 18).
  4. Using a similar vehicle, attempt to establish communication on the same system using scan tool. If communication can be established, go to next step. If communication cannot be established, go to step 17).
  5. Turn ignition off. Check for proper scan tool connection to DLC. If connection to DLC is good, go to next step. If connection to DLC is faulty, go to step 13).
  6. Turn ignition switch to RUN position. Using scan tool, attempt to establish communication with radio. If communication can be established, system is okay. If communication cannot be established, go to next step.
  7. Turn ignition off. Disconnect radio. Using DVOM, check resistance between DLC terminals No. 5 (Black wire) and No. 14 (Dark Green wire). If resistance is infinite, go to next step. If resistance is not infinite, go to step 14).
  8. Turn ignition to RUN position. Check voltage between DLC terminals No. 5 (Black wire) and No. 14 (Dark Green wire). If any voltage is present, go to step 15). If no voltage is present, go to next step.
  9. Turn ignition off. Check resistance between DLC terminal No. 14 (Dark Green wire) and radio harness connector terminal E1 (Dark Green wire). If resistance is 0-5 ohms, go to next step. If resistance is not 0-5 ohms, go to step 16).
  10. Check for power, ground, and proper connection to radio. If circuits and connections are okay, replace radio. If circuits or connections are faulty, repair as necessary. After repairs, recheck system operation.
  11. Check RADIO-HVAC fuse, located in instrument panel fuse block. If fuse is good, go to step 19). If fuse is open, go to step 22).
  12. Check and ensure ground connector to DLC terminal No. 5 (Black wire) is clean and tight. If connection is good, go to step 21). If connection is faulty, go to step 22).
  13. Replace DLC terminal No. 14 or reconnect scan tool as necessary. After repairs, recheck system operation.
  14. Repair short to ground in circuit from DLC terminal 14 (Dark Green wire) to radio. After repairs, recheck system operation.
  15. Turn ignition off. Repair short to voltage in circuit to DLC terminal No. 14 (Dark Green wire). After repairs, recheck system operation.
  16. Repair poor connection or open in circuit between DLC terminal No. 14 (Dark Green wire) and radio harness connector terminal E1. After repairs, recheck system operation.
  17. Scan tool if faulty. Replace scan tool and then recheck system operation.
  18. Check and ensure ground connection to DLC terminal No. 4 (Black wire) is clean and tight. If connection is good, go to step 23). If connection is faulty, go to step 24).
  19. Repair poor connection or open in circuit between DLC terminal No. 16 (Orange wire) and fuse block. After repairs, recheck system operation.
  20. Replace RADIO-HVAC fuse. After replacing fuse, recheck system operation.
  21. Repair poor connection or open in circuit between DLC terminal No. 5 (Black wire) and ground connector. After repairs, recheck system operation.
  22. Repair ground connection to DLC terminal No. 5 (Black wire). After repairs, recheck system operation.
  23. Repair poor connection or open in circuit between DLC terminal No. 4 (Black wire) and ground connector. After repairs, recheck system operation.
  24. Repair ground connector to DLC terminal No. 4 (Black wire). After repairs, recheck system operation.
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