2004 Ford Freestar BaseFACTORY OEM SERVICE PROCEDURE

Climate Control System Smart Junction Box (SJB) DTCS

SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Description Perform Test
C1779 (Single-zone EMTC only) Blower request signal circuit short to ground Go To PINPOINT TEST L: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - EMTC .
B2175 (Single-zone EMTC only) A/C request signal circuit short to ground Go To PINPOINT TEST I: THE AIR CONDITIONING (A/C) IS ALWAYS ON .
B2513 Blower motor relay circuit short to ground EMTC and blower is inoperative, Go To PINPOINT TEST K: THE BLOWER MOTOR IS INOPERATIVE - EMTC . EMTC and blower operates, Go To PINPOINT TEST L: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - EMTC EATC and blower is inoperative, Go To PINPOINT TEST M: THE BLOWER MOTOR IS INOPERATIVE - EATC . EATC and blower operates, Go To PINPOINT TEST N: THE BLOWER MOTOR DOES NOT OPERATE CORRECTLY - EATC .
B2514 Blower motor relay circuit open/short to voltage EMTC, Go To PINPOINT TEST K: THE BLOWER MOTOR IS INOPERATIVE - EMTC . EATC, Go To PINPOINT TEST M: THE BLOWER MOTOR IS INOPERATIVE - EATC .
B2543 Auxiliary control/actuator reference circuit short to ground If auxiliary blower, temperature and mode are all affected, Go To PINPOINT TEST O: THE AUXILIARY BLOWER MOTOR IS INOPERATIVE . If temperature only is affected, Go To PINPOINT TEST Q: THE AUXILIARY TEMPERATURE CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY . If mode only is affected, Go To PINPOINT TEST R: THE AUXILIARY PANEL/FLOOR CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
B2544 Auxiliary control/actuator reference circuit short to voltage If auxiliary blower, temperature and mode are all affected, Go To PINPOINT TEST P: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLY . If temperature only is affected, Go To PINPOINT TEST Q: THE AUXILIARY TEMPERATURE CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY . If mode only is affected, Go To PINPOINT TEST R: THE AUXILIARY PANEL/FLOOR CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
B2559 Auxiliary blower motor relay circuit short to voltage Go To PINPOINT TEST O: THE AUXILIARY BLOWER MOTOR IS INOPERATIVE .
B2688 Auxiliary blower motor relay circuit open/short to ground If auxiliary blower motor is inoperative, Go To PINPOINT TEST O: THE AUXILIARY BLOWER MOTOR IS INOPERATIVE . If auxiliary blower motor operates, Go To PINPOINT TEST P: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLY .
B2561 Auxiliary blower motor speed relay 1 circuit short to voltage Go To PINPOINT TEST P: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLY .
B2562 Auxiliary blower motor speed relay 1 circuit open/short to ground Go To PINPOINT TEST P: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLY .
B2563 Auxiliary blower motor speed relay 2 circuit short to voltage Go To PINPOINT TEST P: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLY .
B2564 Auxiliary blower motor speed relay 2 circuit open/short to ground Go To PINPOINT TEST P: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLY
B2916 Auxiliary blend door motor circuits shorted Go To PINPOINT TEST Q: THE AUXILIARY TEMPERATURE CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
B2917 Auxiliary mode door motor circuits shorted Go To PINPOINT TEST R: THE AUXILIARY PANEL/FLOOR CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
B2919 Auxiliary blower motor speed input circuit short to voltage Go To PINPOINT TEST P: THE AUXILIARY BLOWER MOTOR DOES NOT OPERATE CORRECTLY .
B2920 Auxiliary mode door feedback circuit open/shorted Go To PINPOINT TEST R: THE AUXILIARY PANEL/FLOOR CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
B2921 Auxiliary blend door feedback circuit open/shorted Go To PINPOINT TEST Q: THE AUXILIARY TEMPERATURE CONTROL ONLY IS INOPERATIVE/DOES NOT OPERATE CORRECTLY .
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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