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Pinpoint Test J: The Defrost System Is Inoperative

WARNING: This page is about a different car, the 2007 Lincoln MKX and 2007 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
  1. J1 CHECK CIRCUIT CRD06 (BN/YE) FOR POWER 
    • Disconnect: Heated Rear Window Grid C402A
    • Key in ON position.
    • Turn the heated rear window control switch on.
      • Fig 1: Measuring Voltage Between Heated Rear Window Grid C402A-1, Circuit CRD06 (BN/YE)
      GF0030937Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window grid C402A-1, circuit CRD06 (BN/YE), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J4.
    2. NO  : INSPECT BJB fuse 39 (40A). If OK, go to  J2.
  2. J2 CHECK CIRCUIT CRD06 (BN/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Relay
      • Fig 2: Measuring Resistance Between Heated Rear Window Grid C402A-1, CRD06 (BN/YE)
      GF0030938Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated rear window grid C402A-1, CRD06 (BN/YE), harness side and heated rear window relay pin 87, CRD06 (BN/YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  J3.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  3. J3 CHECK THE BJB 
    • Key in ON position.
      • Fig 3: Measuring Voltage Between Heated Rear Window Relay Pin 30, Circuit SDC02 (RD)
      GF0030939Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window relay pin 30, circuit SDC02 (RD), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J5.
    2. NO  : VERIFY BJB fuse 1 (40A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  4. J4 CHECK CIRCUIT GD149 (BK/GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Grid C402B
      • Fig 4: Measuring Resistance Between C402B-1, Circuit GD149 (BK/GY), Harness Side & Ground
      GF0030940Courtesy of FORD MOTOR CO.
    • Measure the resistance between C402B-1, circuit GD149 (BK/GY), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : CARRY OUT the heated rear window grid wire test. REFER to the component tests. REPAIR as necessary. TEST the system for normal operation.
    2. NO  : Go to  J6.
  5. J5 CHECK CIRCUIT CBP45 (YE) FOR AN OPEN 
      Fig 5: Measuring Voltage Between Heated Rear Window Relay Pin 85, Circuit CBP45 (YE) & Ground
      GF0030941Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window relay pin 85, circuit CBP45 (YE), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. J6 CHECK THE HVAC MODULE OUTPUT 
    • Key in ON position.
    • Turn the heated rear window control switch on.
      • Fig 6: Measuring Voltage Between Heated Rear Window Relay Pin 85, Circuit CBP45 (YE)
      GF0030942Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window relay pin 85, circuit CBP45 (YE), harness side and heated rear window relay pin 86, circuit CH122 (WH/OG).
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  J7.
    2. NO  : Go to  J8.
  7. J7 CHECK THE HEATED REAR WINDOW RELAY 
    • Carry out the Heated Rear Window Relay Component Test. Refer to Refer to COMPONENT TESTING.
    • Did the heated rear window relay pass the component test? 
    1. YES  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
    2. NO  : INSTALL a new heated rear window relay. TEST the system for normal operation.
  8. J8 CHECK CIRCUIT CH122 (WH/OG) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: HVAC Module - Electronic Automatic Temperature Control (EATC) C228B or HVAC module - Electronic Manual Temperature Control (EMTC) C2357A
      • Fig 7: Measuring Resistance Between Heated Rear Window Relay Socket, Circuit CH122 (WH/OG)
      GF0030943Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated rear window relay socket, circuit CH122 (WH/OG), harness side and HVAC module - EATC C228B-23, circuit CH122 (WH/OG), harness side; or HVAC module - EMTC C2357A-3, circuit CH122 (WH/OG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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