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Pinpoint Test K: The Turn Signal Lamps 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. K1 CHECK THE VOLTAGE TO THE ELECTRONIC FLASHER 
    • Disconnect: Electronic Flasher.
    • Key in ON position.
    • Measure the voltage between electronic flasher connector pin 30, circuit 295 (LB/PK), harness side and ground.
      Fig 1: Checking Voltage To Electronic Flasher
      G03878355Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to  K3.
    • No  : GO to K2.
  2. K2 CHECK THE CENTRAL JUNCTION BOX (CJB) 
    • Key in OFF position.
    • Disconnect: CJB C270a.
    • Key in ON position.
    • Measure the voltage between CJB C270a-21, circuit 295 (LB/PK), component side and ground.
      Fig 2: Checking Central Junction Box (CJB)
      G03910970Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : REPAIR circuit 295 (LB/PK). TEST the system for normal operation.
    • No  : INSTALL a new CJB. TEST the system for normal operation.
  3. K3 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between electronic flasher connector pin 86, circuit 57 (BK), harness side and ground.
      Fig 3: Measuring Resistance Between Relay Connector And Ground
      G03910971Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to K4.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  4. K4 CHECK CIRCUIT 44 (LB) FOR AN OPEN OR SHORT TO GROUND 
    • Disconnect: Multifunction Switch C202a.
    • Measure the resistance between multifunction switch C202a-2, circuit 44 (LB), harness side and electronic flasher connector pin 87, circuit 44 (LB), harness side; and between multifunction switch C202a-2, circuit 44 (LB), harness side and ground.
      Fig 4: Checking Circuit 44 (LB) For Open Or Short To Ground
      G03910972Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms between multifunction switch and electronic flasher, and greater than 10,000 ohms between multifunction switch and ground? 
    • Yes  : GO to K5.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  5. K5 CHECK CIRCUIT 385 (WH/RD) FOR A SHORT TO GROUND 
    • Measure the resistance between multifunction switch C202a-3, circuit 385 (WH/RD), harness side and ground.
      Fig 5: Checking Circuit 385 (WH/RD) For Short To Ground
      G03910973Courtesy of FORD MOTOR CO.
    • Is the resistance greater than 10,000 ohms? 
    • Yes  : GO to K6.
    • No  : REPAIR the circuit. TEST the system for normal operation.
  6. K6 CHECK THE MULTIFUNCTION SWITCH 
    • Carry out the multifunction switch component test. Refer to COMPONENT TESTING .
    • Is the multifunction switch OK? 
    • Yes  : INSTALL a new electronic flasher. TEST the system for normal operation.
    • No  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
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