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Home >> Ford >> 2005 >> Escape Hybrid, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 298 (Window And Glass) >> Diagnosis And Testing >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test E: The Defrost System Is Inoperative >> Pinpoint Test E: The Defrost System Is Inoperative

Pinpoint Test E: The Defrost System Is Inoperative

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. E1 CHECK THE REAR WINDOW DEFROST SWITCH CIRCUIT FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: DDM C501c.
    • While pressing the rear window defrost switch, measure the resistance between the DDM C501c-23, circuit 1010 (DB/OG), harness side and ground.
      Fig 1: Measuring Resistance Between DDM C501C-23, Circuit 1010 (DB/OG), Harness Side And Ground
      G04586042Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms with the rear window defrost switch pressed? 

    Yes  : CONNECT the DDM C501c. GO to  E4.

    No  : GO to E2.

  2. E2 CHECK CIRCUIT 1010 (DB/OG) FOR AN OPEN 
    • Disconnect: Rear Window Defrost Switch C241.
    • Measure the resistance between the DDM C501c-23, circuit 1010 (DB/OG), harness side, and the rear window defrost switch C241-1, circuit 1010 (DB/OG), harness side.
      Fig 2: Measuring Resistance Between DDM C501C-23, Circuit 1010 (DB/OG), Harness Side, And Rear Window Defrost Switch C241-1, Circuit 1010 (DB/OG), Harness Side
      G04586043Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : Go to E3.

    No  : REPAIR the circuit. TEST the system for normal operation.

  3. E3 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Measure the resistance between the rear window defrost switch C241-2, circuit 57 (BK), harness side and ground.
      Fig 3: Measuring Resistance Between Rear Window Defrost Switch C241-2 And Ground
      G04586044Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : INSTALL a new rear window defrost switch. TEST the system for normal operation.

    No  : REPAIR the circuit. TEST the system for normal operation.

  4. E4 CHECK THE SIGNAL INPUT 
    • Disconnect: Rear Window Defrost Relay.
    • Key in ON position.
    • Press the rear window defrost switch to ON.
    • Measure the resistance between the rear window defrost relay pin 86, circuit 688 (GY/LB), harness side and ground.
      Fig 4: Measuring Resistance Between Rear Window Defrost Relay Pin 86, Circuit 688 (GY/LB), Harness Side And Ground
      G04586045Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to  E6.

    No  : GO to E5.

  5. E5 CHECK CIRCUIT 688 (GY/LB) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: DDM 501b.
    • Measure the resistance between the rear window defrost relay pin 86, circuit 688 (GY/LB), harness side and the DDM C501b-15, circuit 688 (GY/LB), harness side.
      Fig 5: Measuring Resistance Between Rear Window Defrost Relay Pin 86 And DDM C501B-15, Circuit 688
      G04586046Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : GO to  E13.

    No  : REPAIR the circuit. TEST the system for normal operation.

  6. E6 CHECK CIRCUIT 640 (RD/YE) FOR VOLTAGE 
    • Measure the voltage between the rear window defrost relay pin 85, circuit 640 (RD/YE), harness side and ground.
      Fig 6: Measuring Voltage Between Rear Window Defrost Relay Pin 85, Circuit 640 (RD/YE), Harness Side And Ground
      G04586047Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to E7.

    No  : VERIFY the central junction box (CJB) fuse 26 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

  7. E7 CHECK CIRCUIT 185 (BK) FOR VOLTAGE 
    • Measure the voltage between the rear window defrost relay pin 30, circuit 185 (BK), harness side and ground.
      Fig 7: Measuring Voltage Between Rear Window Defrost Relay Pin 30, Circuit 185 (BK), Harness Side And Ground
      G04586048Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to E8.

    No  : VERIFY the battery junction box (BJB) fuse 107 (40A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.

  8. E8 CHECK THE REAR WINDOW DEFROST RELAY FOR CORRECT OPERATION 
    • Carry out the ISO relay test for the rear window defrost relay. Refer to COMPONENT TESTING for schematic and connector information.
    • Is the rear window defrost relay OK? 

    Yes  : GO to E9.

    No  : INSTALL a new rear window defrost relay. TEST the system for normal operation.

  9. E9 CHECK THE RELAY OUTPUT TO THE HEATED REAR WINDOW GRID 
    • Key in OFF position.
    • Connect: Rear Window Defrost Relay.
    • Disconnect: Heated Rear Window Grid Connector.
    • Key in ON position.
    • Press the rear window defrost switch to on.
    • Measure the voltage between the heated rear window grid connector harness side and ground.
      Fig 8: Measuring Voltage Between Heated Rear Window Power Supply Connector, Harness Side And Ground
      G04586049Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : GO to  E12.

    No  : GO to E10.

  10. E10 CHECK THE RELAY OUTPUT TO THE ANTENNA MODULE 
    • Key in OFF position.
    • Disconnect: Antenna Module.
    • Key in ON position.
    • Press the rear window defrost switch to on.
    • Measure the voltage between the antenna module pin 1, circuit 186 (BN/LB), harness side and ground.
      Fig 9: Measuring Voltage Between Antenna Module Pin 1, Circuit 186 (BN/LB), Harness Side And Ground
      G04586050Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 

    Yes  : INSTALL a new antenna module. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.

    No  : GO to E11.

  11. E11 CHECK CIRCUIT 186 (BN/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Fuse 32 (10A).
    • Disconnect: Rear Window Defrost Relay.
    • Measure the resistance between the antenna module pin 1, circuit 186 (BN/LB), harness side and the pin 87, circuit 186 (BN/LB), harness side; and between the antenna module pin 1, circuit 186 (BN/LB), harness side and ground.
      Fig 10: Checking Circuit 186 (BN/LB) For An Open Or Short To Ground
      G04586051Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between the antenna module and the rear window defrost relay, and greater than 10,000 ohms between the antenna module and ground? 

    Yes  : INSTALL a new rear window defrost relay. TEST the system for normal operation.

    No  : REPAIR the circuit. TEST the system for normal operation.

  12. E12 CHECK THE GROUND FOR THE HEATED REAR WINDOW GRID 
    NOTE: Make sure the accessory delay has timed out.
    • Key in OFF position.
    • Disconnect: Heated Rear Window Grid Ground Connector.
    • Measure the resistance between the heated rear window grid ground connector, circuit 57 (BK), harness side and ground.
      Fig 11: Measuring Resistance Between Heated Rear Window Grid Ground Connector And Ground
      G04586052Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 

    Yes  : CARRY OUT the heated rear window grid wire test. REFER to the COMPONENT TESTS . REPAIR as necessary. TEST the system for normal operation.

    No  : INSTALL a new antenna module. REFER to INFORMATION AND ENTERTAINMENT SYSTEMS . TEST the system for normal operation.

  13. E13 CHECK FOR CORRECT DDM OPERATION 
    • Disconnect all the DDM connectors.
    • Check for:
      • corrosion
      • pushed-out pins
    • Connect all the DDM connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 

    Yes  : INSTALL a new DDM. REFER to MULTIFUNCTION ELECTRONIC MODULES . TEST the system for normal operation.

    No  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.

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