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Pinpoint Test F: The Defrost System Is Inoperative

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 CHECK THE SJB DTCs 
    • Use the recorded DTC results from the SJB for the continuous and on-demand self tests.
    • Is DTC B1345 present? 
    1. YES  : Go to  F9.
    2. NO  : Go to  F2.
  2. F2 CHECK THE REAR WINDOW DEFROST RELAY 
    • Key in OFF position.
    • Disconnect: Rear Window Defrost Relay C1099
    • Carry out the Rear Window Defrost Relay component test. Refer to COMPONENT TESTING article.
    • Did the rear window defrost relay pass the component test? 
    1. YES  : Go to  F3.
    2. NO  : INSTALL a new rear window defrost relay. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  3. F3 CHECK THE REAR WINDOW DEFROST RELAY FEED CIRCUITS FOR VOLTAGE 
      Fig 1: Checking Circuits For Voltage
      GF0023763Courtesy of FORD MOTOR CO.
    • Measure the voltage between rear window defrost relay C1099-1, circuit 185 (BK), harness side and ground; and between rear window defrost relay C1099-3, circuit 185 (BK), harness side and ground.
    • Are the voltages greater than 10 volts? 
    1. YES  : Go to  F5.
    2. NO  : Go to  F4.
  4. F4 CHECK CIRCUIT 185 (BK) FOR AN OPEN 
    • Disconnect: SJB C2280b
      • Fig 2: Checking Circuit For Voltage
      GF0023764Courtesy of FORD MOTOR CO.
    • Measure the voltage between SJB C2280b-1, circuit 185 (BK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  F13.
    2. NO  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  5. F5 CHECK CIRCUIT 186 (BN/LB) FOR VOLTAGE 
    • Connect: Rear Window Defrost Relay
    • Disconnect: Rear Window Defrost Grid C402a
    • Key in ON position.
    • Press the rear window defrost switch to the ON position.
      • Fig 3: Checking Circuit For Voltage
      GF0019271Courtesy of FORD MOTOR CO.
    • Measure the voltage between rear window defrost grid C402a-1, circuit 186 (BK), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  F6.
    2. NO  : INSPECT smart junction box (SJB) fuse 10 (15A). If OK, go to  F7 .
  6. F6 CHECK THE GRID GROUND CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Rear Window Defrost C402b
      • Fig 4: Checking Circuit For Open
      GF0019274Courtesy of FORD MOTOR CO.
    • Measure the resistance between rear window defrost grid C402b-1, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new liftgate window glass. REFER to Window Glass - Liftgate . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  7. F7 CHECK CIRCUIT 186 (BN/LB) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: SJB C2280c
      • Fig 5: Checking Circuit For Open
      GF0023765Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280c-1, circuit 186 (BN/LB), harness side and rear window defrost grid C402a-1, circuit 186 (BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  F8.
    2. NO  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  8. F8 CHECK CIRCUIT 1010 (DB/OG) FOR AN OPEN 
    • Disconnect: SJB C2280e
    • Disconnect: Rear Window Defrost Switch C241
      • Fig 6: Checking Circuit For Open
      GF0023766Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280e-14, circuit 1010 (DB/OG), harness side and rear window defrost switch C241-2, circuit 1010 (DB/OG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  F9.
    2. NO  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  9. F9 CHECK CIRCUIT 1010 (DB/OG) FOR A SHORT TO GROUND 
    NOTE: A short to ground on circuit 1010 (DB/OG) sets DTC B1345. The SJB then ignores input from the rear window defrost switch and causes the rear window defrost to be inoperative.
    • Key in OFF position.
    • Disconnect: Rear Window Defrost Switch C241
      • Fig 7: Checking Circuit For Short To Ground
      GF0023767Courtesy of FORD MOTOR CO.
      NOTE: Make sure the rear window defrost relay is disconnected.
    • Measure the resistance between rear window defrost switch C241-2, circuit 1010 (DB/OG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  F11.
    2. NO  : Go to  F10.
  10. F10 CHECK THE SJB FOR AN INTERNAL SHORT 
    • Disconnect: SJB C2280e
      • Fig 8: Checking SJB
      GF0023767Courtesy of FORD MOTOR CO.
    • Measure the resistance between rear window defrost switch C241-2, circuit 1010 (DB/OG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  F13.
    2. NO  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  11. F11 CHECK CIRCUIT 570 (BK/WH) FOR AN OPEN 
      Fig 9: Checking Circuit For Open
      GF0023768Courtesy of FORD MOTOR CO.
    • Measure the resistance between rear window defrost switch C241-1, circuit 570 (BK/WH), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  F12.
    2. NO  : REPAIR the circuit. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  12. F12 CHECK THE REAR WINDOW DEFROST SWITCH 
      Fig 10: Checking Rear Window Defrost Switch
      GF0023769Courtesy of FORD MOTOR CO.
    • Measure the resistance between rear window defrost switch C241-1 and C241-2, component side, while pressing and releasing the switch.
    • Is the resistance less than 5 ohms with the switch pressed and greater then 10,000 ohms with the switch released? 
    1. YES  : Go to  F13.
    2. NO  : INSTALL a new rear window defrost switch. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
  13. F13 CHECK FOR CORRECT SJB OPERATION 
    • Disconnect all the SJB connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all the 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. TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. RUN the on-demand self test (required to clear the DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
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