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Home >> Ford >> 2009 >> Taurus X SEL, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1295 (Windows & Glass - Glass, Frames & Mechanisms) >> Diagnostic Tests >> Glass, Frames and Mechanisms >> Pinpoint Tests >> Pinpoint Test D: The Defrost System is Inoperative >> Pinpoint Test D: The Defrost System Is Inoperative

Pinpoint Test D: The Defrost System Is Inoperative

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. D1 CHECK FOR RECORDED SJB DTCs 
    • Key in ON position.
    • Check the recorded results from the SJB self-test.
    • Are any DTCs retrieved? 
    1. YES  : If DTC B1348, go to  D10. If DTC B1349, go to  D9. If DTC B1345, go to  D13. If DTC B2060, go to  D16. If DTC B2061, go to  D15.
    2. NO  : Go to  D2.
  2. D2 CHECK CIRCUIT 1389 (WH) FOR GROUND 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Relay
    • Key in ON position.
    • Press the heated rear window switch to ON.
      • Fig 1: Checking Circuit 1389 (WH) For Ground
      GF0014799Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated rear window relay pin 86, circuit 1389 (WH), harness side and ground.
    • Is the resistance less than 100 ohms? 
    1. YES  : Go to  D3.
    2. NO  : Go to  D7.
  3. D3 CHECK CIRCUIT 298 (VT/OG) FOR AN OPEN 
    • Key in OFF position.
      • Fig 2: Checking Circuit 298 (VT/OG) For An Open
      GF0014800Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window relay pin 30, harness side and ground; and between heated rear window relay pin 85, circuit 298 (VT/OG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  D4.
    2. NO  : VERIFY the bussed electrical center (BEC) fuse 52 (30A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  4. D4 CHECK THE HEATED REAR WINDOW RELAY FOR AN OPEN OR INTERNAL SHORT (NO DTCs) 
    • Carry out the Heated Rear Window Relay Component Test. Refer to COMPONENT TESTING.
    • Is the heated rear window relay OK? 
    1. YES  : Go to  D5.
    2. NO  : INSTALL a new heated rear window relay. TEST the system for normal operation.
  5. D5 CHECK CIRCUIT 186 (BN/LB) FOR AN OPEN 
    • Disconnect: Heated Rear Window
    • Key in ON position.
      • Fig 3: Checking Circuit 186 (BN/LB) For Open (1 Of 2)
      GF0014801Courtesy of FORD MOTOR CO.
    • Connect a fused (30A) jumper wire between heated rear window relay pin 30, circuit 298 (VT/OG), harness side and heated rear window relay pin 87, circuit 186 (BN/LB), harness side.
      • Fig 4: Checking Circuit 186 (BN/LB) For Open (2 Of 2)
      GF0014802Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window C402a-1 (coupe), circuit 186 (BN/LB), harness side and ground; or between heated rear window C402-1 (convertible), circuit 186 (BN/LB), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : REMOVE the jumper wire. Go to  D6 .
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. D6 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
      • Fig 5: Checking Circuit 1205 (BK) For Open
      GF0000077Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated rear window C402b-1 (coupe), circuit 1205 (BK), harness side and ground; or between heated rear window C402-2 (convertible), circuit 1205 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR the heated rear window grid. REFER to Window Grid Wire Repair . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. D7 CHECK THE HVAC FOR CORRECT OPERATION 
    NOTE: The use of an analog ohmmeter may be necessary for this step due to the momentary ground signal of the heated rear window switch.
    • Key in OFF position.
    • Disconnect: SJB C2280b
      • Fig 6: Checking HVAC For Correct Operation
      GF0046216Courtesy of FORD MOTOR CO.
    • While pressing the heated rear window switch to ON, measure the resistance between SJB C2280b-18, circuit 1426 (PK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  D18.
    2. NO  : Go to  D8.
  8. D8 CHECK CIRCUIT 1426 (PK) FOR AN OPEN 
    • Disconnect: HVAC Module C294a
      • Fig 7: Checking Circuit 1426 (PK) For An Open
      GF0046217Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280b-18, circuit 1426 (PK), harness side and HVAC C294a-10, circuit 1426 (PK), 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.
  9. D9 CHECK CIRCUIT 298 (VT/OG) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Relay
      • Fig 8: Checking Circuit 298 (VT/OG) For Voltage
      GF0014805Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window relay pin 85, circuit 298 (VT/OG), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : Go to  D10.
    2. NO  : VERIFY the bussed electrical center (BEC) fuse 52 (30A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
  10. D10 CHECK THE HEATED REAR WINDOW RELAY FOR AN OPEN OR AN INTERNAL SHORT (DTC B1348, B1349) 
    • Key in OFF position.
    • Disconnect: Heated Rear Window Relay
    • Carry out the Heated Rear Window Relay Component Test. Refer to COMPONENT TESTING.
    • Is the heated rear window relay OK? 
    1. YES  : Go to  D11.
    2. NO  : INSTALL a new heated rear window relay. TEST the system for normal operation.
  11. D11 CHECK CIRCUIT 1389 (WH) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: SJB C2280c
      • Fig 9: Checking Circuit 1389 (WH) For An Open Or Short To Ground
      GF0046218Courtesy of FORD MOTOR CO.
    • Measure the resistance between heated rear window relay pin 86, circuit 1389 (WH), harness side and SJB C2280c-12, circuit 1389 (WH), harness side; and between heated rear window relay pin 86, circuit 1389 (WH) and ground.
    • Is the resistance less than 5 ohms between the heated rear window relay and the SJB and greater than 10,000 ohms between heated rear window relay and ground? 
    1. YES  : Go to  D12.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  12. D12 CHECK CIRCUIT 1389 (WH) FOR A SHORT TO VOLTAGE 
    • Key in ON position.
      • Fig 10: Measuring Voltage Between Heated Rear Window Relay C1099-86 Circuit 1389 (WH) And Ground
      GF0014807Courtesy of FORD MOTOR CO.
    • Measure the voltage between heated rear window relay pin 86, circuit 1389 (WH), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  D18.
  13. D13 VERIFY DTC B1345 
    • Key in OFF position.
    • Disconnect: SJB C2280b
    • Key in ON position.
      • Fig 11: Measuring Resistance Between SJB C2280B-18, Circuit 1426 (PK), Harness Side & Ground
      GF0046216Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280b-18, circuit 1426 (PK), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  D18.
    2. NO  : Go to  D14.
  14. D14 CHECK CIRCUIT 1426 (PK) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: HVAC Module C294a
      • Fig 12: Checking Circuit 1426 (PK) For A Short To Ground
      GF0046216Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280b-18, circuit 1426 (PK), harness side and ground.
    • Is the resistance greater than 10,000 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.
  15. D15 CHECK CIRCUIT 1427 (TN/LB) FOR AN OPEN OR SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: HVAC Module C294a
    • Disconnect: SJB C2280b
      • Fig 13: Checking Circuit 1427 (TN/LB) For An Open Or Short To Ground
      GF0046219Courtesy of FORD MOTOR CO.
    • Measure the resistance between SJB C2280b-7, circuit 1427 (TN/LB), harness side and HVAC module C294a-4, circuit 1427 (TN/LB), harness side; and between SJB C2280b-7, circuit 1427 (TN/LB), harness side and ground.
    • Is the resistance less than 5 ohms between the SJB and the HVAC and greater than 10,000 ohms between the SJB and ground? 
    1. YES  : Go to  D16.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  16. D16 CHECK CIRCUIT 1427 (TN/LB) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: HVAC Module C294a
    • Disconnect: SJB C2280b
    • Key in ON position.
      • Fig 14: Checking Circuit 1427 (TN/LB) For A Short To Voltage
      GF0046220Courtesy of FORD MOTOR CO.
    • Measure the voltage between SJB C2280b-7, circuit 1427 (TN/LB), harness side and ground.
    • Is any voltage present? 
    1. YES  : REPAIR the circuit. TEST the system for normal operation.
    2. NO  : Go to  D17.
  17. D17 CHECK THE HVAC MODULE FOR AN OPEN OR INTERNAL SHORT 
    • Install a known good HVAC module.
    • Operate the heated rear window.
    • Does the indicator illuminate? 
    1. YES  : INSTALL a new HVAC module. REFER to CLIMATE CONTROL . TEST the system for normal operation.
    2. NO  : Go to  D18.
  18. D18 CHECK THE SJB FOR CORRECT OPERATION 
    • Disconnect all of the SJB connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
    • Connect all of 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 . REPEAT the self-test. 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.
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