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Pinpoint Test B: The Low Beams Are Inoperative

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK FOR VOLTAGE TO CENTRAL JUNCTION BOX (CJB) FUSE 46 (10A) AND CJB FUSE 47 (10A) 
    • Key in OFF position.
    • Place the multifunction switch in the low beam position.
    • Place the headlamp switch in the ON position.
    • Measure the voltage between following fuses and ground:
      • CJB fuse 46 (10A)
      • CJB fuse 47 (10A)
    • Are the voltages greater than 10 volts? 
    • Yes  : GO to PINPOINT TEST D .
    • No  : TURN the headlamp switch off. GO to B2.
  2. B2 CHECK FOR VOLTAGE TO THE CJB 
    • Disconnect: CJB C270g.
    • Place the headlamp switch in the ON position.
    • Measure the voltage between CJB C270g-4, circuit 13 (RD/BK), harness side and ground.
      Fig 1: Checking For Voltage To CJB
      G03910939Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : INSTALL a new CJB. TEST the system for normal operation.
    • No  : TURN the headlamp switch off. If equipped with daytime running lamps (DRL), GO to B3.

      TURN the headlamp switch off. If not equipped with daytime running lamps (DRL), GO to  B5.

  3. B3 CHECK THE VOLTAGE TO THE DRL FULL RELAY No.1 
    • Disconnect: DRL Full Relay No.1.
    • Place the headlamp switch in the ON position.
    • Measure the voltage between DRL full relay No.1 pin 87a, circuit 1033 (RD/YE), harness side and ground.
      Fig 2: Checking Voltage To DRL Full Relay No.1
      G03910941Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR circuit 13 (RD/BK). TEST the system for normal operation.
    • No  : TURN the headlamp switch off. GO to B4.
  4. B4 CHECK CIRCUITS 13 (RD/BK) AND 1033 (RD/YE) FOR AN OPEN 
    • Disconnect: Multifunction Switch C202a.
    • Measure the resistance between DRL full relay No.1 pin 4, circuit 1033 (RD/YE), harness side and multifunction switch C202a-9, circuit 13 (RD/BK), harness side.
      Fig 3: Checking Circuits 13 (RD/BK) And 1033 (RD/YE) For Open
      G03910942Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
    • No  : REPAIR circuit 13 (RD/BK) or circuit 1033 (RD/YE) as necessary. TEST the system for normal operation.
  5. B5 CHECK CIRCUIT 13 (RD/BK) FOR AN OPEN 
    • Disconnect: Multifunction Switch C202a.
    • Measure the resistance between CJB C270g-4, circuit 13 (RD/BK), harness side and multifunction switch C202a-9, circuit 13 (RD/BK), harness side.
      Fig 4: Checking Circuit 13 (RD/BK) For Open
      G03910943Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
    • No  : REPAIR the circuit. TEST the system for normal operation.
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