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DTC B1539: Mirror Driver Switch Assembly Circuit Failure

  1. Turn ignition off. Disconnect DDM connector C456. Turn ignition on. Check voltage at connector C456 terminal No. 10 (Yellow/Black wire). If battery voltage exists, go to next step. If battery voltage does not exist, go to step 3).
  2. Turn ignition off. Disconnect Outside Mirror Control Switch connector C500. See Fig 1 . Turn ignition on. Check voltage at DDM connector C456 terminal No. 10 (Yellow/Black wire). If battery voltage exists, repair Yellow/Black wire short to power. If battery voltage does not exist, replace Outside Mirror Control Switch.
    Fig 1: Outside Mirror Control Switch Connector C500 Terminals
    G97G28601Courtesy of FORD MOTOR CO.
  3. Check voltage at connector C456 terminal No. 8 (Dark Green/Orange wire). If battery voltage exists, repair Dark Green/Orange wire short to power. If battery voltage does not exist, replace Outside Mirror Control Switch.
  4. Turn ignition off. Disconnect Outside Mirror Control Switch connector C500. Turn ignition on. Check voltage at DDM connector C456 terminal No. 8 (Dark Green/Orange wire). If battery voltage exists, repair Dark Green/Orange wire short to power. If battery voltage does not exist, replace Outside Mirror Control Switch.
  5. Check voltage at connector C456 terminal No. 9 (Red/Orange wire). If battery voltage exists, go to next step. If battery voltage does not exist, go to step 7).
  6. Turn ignition off. Disconnect Outside Mirror Control Switch connector C500. Turn ignition on. Check voltage at DDM connector C456 terminal No. 9 (Red/Orange wire). If battery voltage exists, repair Red/Orange wire short to power. If battery voltage does not exist, replace Outside Mirror Control Switch.
  7. Check voltage at connector C456 terminal No. 21 (Dark Blue/Orange wire). If battery voltage exists, go to next step. If battery voltage does not exist, go to step 9).
  8. Turn ignition off. Disconnect Outside Mirror Control Switch connector C500. Turn ignition on. Check voltage at DDM connector C456 terminal No. 21 (Dark Blue/Orange wire). If battery voltage exists, repair Dark Blue/Orange wire short to power. If battery voltage does not exist, replace Outside Mirror Control Switch.
  9. Check voltage at connector C456 terminal No. 20 (Purple/Orange wire). If battery voltage exists, go to next step. If battery voltage does not exist, go to step 11).
  10. Turn ignition off. Disconnect Outside Mirror Control Switch connector C500. Turn ignition on. Check voltage at DDM connector C456 terminal No. 20 (Purple/Orange wire). If battery voltage exists, repair Purple/Orange wire short to power. If battery voltage does not exist, replace Outside Mirror Control Switch and retest.
  11. Turn ignition off. Reconnect DDM connector C456. Perform DDM Self Test. If DTC B1539 returns, replace DDM and retest system. If DTC B1539 does not return, problem is intermittent.
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