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Pinpoint Test J: The Defrost System Is Inoperative - MKZ

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
  1. J1 CHECK THE DTCs 
    • Refer to the results from the previous SJB self-test.
    • Was DTC B1345 retrieved? 
    1. YES  : Go to  J2.
    2. NO  : Go to  J3.
  2. J2 CHECK CIRCUIT CH122 (WH/OG) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: SJB C2280D
    • Disconnect: HVAC C2356A
      • Fig 1: Checking Circuit CH122 (WH/OG) For Short To Ground
      GF0028387Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280D-16, circuit CH122 (WH/OG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : INSTALL a new HVAC. REFER to CLIMATE CONTROL article. REPEAT the self-test. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  3. J3 CHECK THE SJB REAR DEFROST SWITCH REQUEST PID (RDEF_SW) 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: DataLogger - SJB
    • Monitor the SJB PID RDEF_SW while pressing the rear defrost switch.
    • Does the PID value agree with the rear defrost switch when pressed? 
    1. YES  : Go to  J5.
    2. NO  : Go to  J4.
  4. J4 CHECK CIRCUIT CH122 (WH/OG) FOR AN OPEN CIRCUIT 
    • Key in OFF position.
    • Disconnect: SJB C2280D
    • Disconnect: HVAC C2356A
      • Fig 2: Checking Circuit CH122 (WH/OG) For Open Circuit
      GF0028388Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280D-16, circuit CH122 (WH/OG), harness side and HVAC C2356A-10, circuit CH122 (WH/OG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new HVAC. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. J5 CHECK THE SJB OUTPUT 
    • Turn the rear defroster ON. Measure the voltage across the rear window defrost grid terminals.
    • Is the voltage greater than 10 volts? 
    1. YES  : REPAIR the rear window defrost grid or INSTALL a new rear window glass. REFER to Window Grid Wire Repair , Window Glass - Rear . TEST the system for normal operation.
    2. NO  : Go to  J6.
  6. J6 CHECK CIRCUIT CLS38 (VT/WH) VOLTAGE 
    • Key in OFF position.
    • Connect: SJB C2280A
    • Disconnect: Antenna module C4194B
    • Key in ON position.
    • Turn the rear defroster ON.
      • Fig 3: Checking Circuit CLS38 (VT/WH) Voltage
      GF0001984Courtesy of FORD MOTOR CO.
    • Measure the voltage between antenna module C4194B-1, circuit CLS38 (VT/WH), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : INSPECT antenna module jumper harness and rear window defrost grid ground circuit for damage and repair as necessary. If jumper harness and defrost grid ground wire are OK, INSTALL a new antenna module.
    2. NO  : VERIFY SJB fuse 8 (30A) is OK. If OK, go to  J7. If not OK, REFER to SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. TEST the system for normal operation.
  7. J7 CHECK FOR POWER TO THE SJB HEATED BACKLIGHT CIRCUIT 
    • Key in OFF position.
    • Disconnect: SJB C2280A
      • Fig 4: Checking For Power To SJB Heated Backlight Circuit
      GF0028389Courtesy of FORD MOTOR CO.
    • Measure the voltage between SJB C2280A-29, circuit SBB06 (BN/RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J8.
    2. NO  : VERIFY battery junction box (BJB) fuse 6 (40A) is OK. If OK, REPAIR the circuit. If not OK, REFER to SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. TEST the system for normal operation.
  8. J8 CHECK CIRCUIT CLS38 (VT/WH) FOR AN OPEN 
    • Disconnect: SJB C2280E
    • Key in OFF position.
      • Fig 5: Checking Circuit CLS38 (VT/WH) For Open
      GF0028390Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280E-1, circuit CLS38 (VT/WH), harness side and antenna module C4194B-1, circuit CLS38 (VT/WH), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  J9.
    2. NO  : REPAIR the circuit(s). TEST the system for normal operation.
  9. J9 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all SJB connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all SJB connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC MODULES article for the removal and installation procedure. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
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