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Pinpoint Test D: DTC B1259 Or DTC B1261 - Solar Radiation Sensor Open Circuit Or Short To Ground

WARNING: This page is about a different car, the 2005 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
  1. D1 CHECK THE SOLAR RADIATION SENSOR RESISTANCE 
    • Key in OFF position.
    • Disconnect: Solar Radiation Sensor C287.
    • Measure the resistance between the solar radiation sensor terminals C287-2 and C287-6 and between C287-1 and C287-2.
      Fig 1: Measuring Resistance Between Solar Radiation Sensor Terminals C287-2 And C287-6 And Between C287-1 And C287-2
      G03944974Courtesy of FORD MOTOR CO.
    • Is continuity present and the resistance greater than 0 ohms? 
    • Yes  : GO to  D2.
    • No  : INSTALL a new solar radiation sensor and bracket. TEST the system for normal operation.
  2. D2 CHECK THE DATC MODULE OUTPUT VOLTAGE 
    • Key in ON position.
    • Press the AUTOMATIC button.
    • Measure the voltage between the solar radiation sensor C287-1, circuit 468 (BN) and C287-2, circuit 676 (PK/OG).
      Fig 2: Measuring Voltage Between Solar Radiation Sensor C287-1, Circuit 468 (BN) And C287-2, Circuit 676 (PK/OG)
      G03944976Courtesy of FORD MOTOR CO.
    • Measure the voltage between the solar radiation sensor C287-2, circuit 676 (PK/OG) and C287-6, circuit 476 (BN/YE).
      Fig 3: Measuring Voltage Between Solar Radiation Sensor C287-2, Circuit 676 (PK/OG) And C287-6, Circuit 476 (BN/YE)
      G03879113Courtesy of FORD MOTOR CO.
    • Are the voltages between 4.7 and 5.1 volts? 
    • Yes  : INSTALL a new DATC module. TEST the system for normal operation.
    • No  : If diagnosing DTC 1259, GO to  D3.

      If diagnosing DTC 1261, GO to  D5.

  3. D3 CHECK CIRCUIT 468 (BN) AND CIRCUIT 476 (BN/YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: DATC Module C228b.
    • Measure the resistance between the DATC module C228b-6, circuit 468 (BN) and the solar radiation sensor C287-1, circuit 468 (BN).
      Fig 4: Measuring Resistance Between DATC Module C228b-6 And Solar Radiation Sensor C287-1, Circuit 468 (BN)
      G04002860Courtesy of FORD MOTOR CO.
    • Measure the resistance between the DATC module C228b-18, circuit 476 (BN/YE) and the solar radiation sensor C287-6, circuit 476 (BN/YE).
      Fig 5: Measuring Resistance Between DATC Module C228b-18, Circuit 476 (BN/YE) And Solar Radiation Sensor C287-6, Circuit 476 (BN/YE)
      G04002861Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to  D4.
    • No  : REPAIR the circuit for an open. TEST the system for normal operation.
  4. D4 CHECK CIRCUIT 676 (PK/OG) FOR AN OPEN 
    • Measure the resistance between the solar radiation sensor C287-2, circuit 676 (PK/OG) and ground.
      Fig 6: Measuring Resistance Between Solar Radiation Sensor C287-2, Circuit 676 (PK/OG) And Ground
      G03879114Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new DATC module. TEST the system for normal operation.
    • No  : REPAIR circuit 676 (PK/OG) for an open. TEST the system for normal operation.
  5. D5 CHECK CIRCUIT 468 (BN) AND 476 (BN/YE) FOR A SHORT TO CIRCUIT 676 (PK/OG) 
    • Key in OFF position.
    • Disconnect: DATC Module C228b.
    • Measure the resistance between the solar radiation sensor C287-1, circuit 468 (BN) and circuit C287-2, 676 (PK/OG).
      Fig 7: Measuring Resistance Between Solar Radiation Sensor C287-1, Circuit 468 (BN) And Circuit C287-2, 676 (PK/OG)
      G03998048Courtesy of FORD MOTOR CO.
    • Measure the resistance between the solar radiation sensor C287-6, circuit 476 (BN/YE) and circuit C287-2, 676 (PK/OG).
      Fig 8: Measuring Resistance Between Solar Radiation Sensor C287-6, Circuit 476 (BN/YE) And Circuit C287-2, 676 (PK/OG)
      G04002864Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : GO to  D6.
    • No  : REPAIR circuit 468 (BN) or 476 (BN/YE) for a short to circuit 676 (PK/OG). TEST the system for normal operation.
  6. D6 CHECK CIRCUIT 468 (BN) AND CIRCUIT 476 (BN/YE) FOR A SHORT TO GROUND 
    • Measure the resistance between the solar radiation sensor C287-1, circuit 468 (BN) and ground.
      Fig 9: Measuring Resistance Between Solar Radiation Sensor C287-1, Circuit 468 (BN) And Ground
      G04002865Courtesy of FORD MOTOR CO.
    • Measure the resistance between the solar radiation sensor C287-6, circuit 476 (BN/YE) and ground.
      Fig 10: Measuring Resistance Between Solar Radiation Sensor C287-6, Circuit 476 (BN/YE) And Ground
      G03879117Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes  : INSTALL a new DATC module. TEST the system for normal operation.
    • No  : REPAIR circuit 468 (BN) or 476 (BN/YE) for a short to ground. TEST the system for normal operation.
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