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Home >> Ford >> 2000 >> Contour SE, 2.0 3, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1825 (Windows And Glass - F-150 & Mark LT) >> Diagnostic Tests >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test G: The Defrost System is Inoperative >> Pinpoint Test G: The Defrost System Is Inoperative

Pinpoint Test G: The Defrost System Is Inoperative

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. G1 CHECK THE POWER TO THE HEATED REAR WINDOW RELAY 
    • Disconnect: Heated Rear Window Relay
    • Key in ON position.
    • Measure the voltage between heated rear window relay socket pin 86 harness side and ground; and between pin 30 harness side and ground.
      Fig 1: Checking Power To Heated Rear Window Relay
      GF0001784Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  G2.
    2. NO  : VERIFY the CJB fuses 13 (10A) and 114 (40A) are OK. If OK, REPAIR the circuit(s). TEST the system for normal operation.
  2. G2 CHECK THE IC OUTPUT 
    • Turn on the rear window defrost.
    • Measure the voltage between heated rear window relay socket pin 85 and pin 86 harness side.
      Fig 2: Checking IC Output
      GF0001983Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  G3.
    2. NO  : Go to  G6.
  3. G3 CHECK THE HEATED REAR WINDOW RELAY 
    • Carry out the Heated Rear Window Relay Component Test. Refer to COMPONENT TESTING.
    • Did the heated backlight relay pass the component test? 
    1. YES  : Go to  G4.
    2. NO  : INSTALL a new heated rear window relay. TEST the system for normal operation.
  4. G4 CHECK THE REAR WINDOW DEFROST GRID VOLTAGE 
    • Connect: Heated Rear Window Relay
    • Disconnect: Rear Window Defrost Grid Power C3241A
    • Key in ON position.
    • Turn rear window defrost ON.
    • Measure the voltage between rear window defrost grid power C3241A-1, circuit 186 (BN/LB) and ground.
      Fig 3: Checking Rear Window Defrost Grid Voltage
      GF0001984Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  G5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. G5 CHECK THE REAR WINDOW DEFROST GRID GROUND 
    • Key in OFF position.
    • Disconnect: Rear Window Defrost Grid Ground C3241B
    • Measure the resistance between rear window defrost grid ground C3241B-1, circuit 57 (BK) and ground.
      Fig 4: Checking Rear Window Defrost Grid Ground
      GF0001985Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR the rear window defrost grid or INSTALL a new rear window glass. REFER to Window Grid Wire Repair  or Window Glass - Rear  in this article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. G6 CHECK THE REAR WINDOW DEFROST SWITCH 
    • Enter the following diagnostic mode on the scan tool: IC DataLogger.
    • Monitor the IC PID RDEF_SW while pressing and releasing the rear window defrost switch.
    • Does the PID agree with the rear window defrost switch position? 
    1. YES  : Go to  G7.
    2. NO  : Go to  G8.
  7. G7 CHECK CIRCUIT 1009 (OG/YE) FOR AN OPEN 
    • Disconnect: IC C220b
    • Measure the resistance between IC C220b-6, circuit 1009 (OG/YE) and rear window defrost relay socket pin 85, circuit 1009 (OG/YE) harness side.
      Fig 5: Checking Circuit 1009 (OG/YE) For Open
      GF0001786Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new IC. REFER to INSTRUMENT CLUSTER article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. G8 CHECK CIRCUIT 1010 (DB/OG) FOR AN OPEN 
    • Disconnect: IC C220a
    • Disconnect: HVAC Module - Electronic Automatic Temperature Control (EATC) C228a or HVAC Module - Electronic Manual Temperature Control (EMTC) C294a
    • Measure the resistance between IC C220a-8, circuit 1010 (DB/OG) and HVAC module - EATC C228a-10 or HVAC module - EMTC C294a-10, circuit 1010 (DB/OG) harness side.
      Fig 6: Checking Circuit 1010 (DB/OG) For Open
      GF0001986Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new HVAC module - EATC or HVAC module - EMTC. REFER to CLIMATE CONTROL article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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