Pinpoint Test K: The Turn Signal Lamps Are Inoperative

WARNING: This page is about a different car, the 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

K1 CHECK THE VOLTAGE TO THE ELECTRONIC FLASHER
- Disconnect: Electronic Flasher C2047.
- Key in ON position.
- Measure the voltage between the electronic flasher C2047-2, circuit 295 (LB/PK), harness side and ground.
  
  Fig 1: Checking Voltage To Electronic Flasher
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes : GO to K3.

No : VERIFY the CJB fuse 27 (15A) is OK. If OK, GO to K2.
K2 CHECK THE CJB
- Key in OFF position.
- Disconnect: CJB C270a.
- Key in ON position.
- Measure the voltage between CJB C270a pin 21, circuit 295 (LB/PK), component side and ground.
  
  Fig 2: Checking CJB
  Courtesy 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.
K3 CHECK CIRCUIT 57 (BK) FOR AN OPEN
- Key in OFF position.
- Measure the resistance between the electronic flasher C2047-5, circuit 57 (BK), harness side and ground.
  
  Fig 3: Checking Circuit 57 (BK) For Open
  Courtesy 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.
K4 CHECK CIRCUIT 44 (LB) FOR AN OPEN OR A SHORT TO GROUND
- Disconnect: Multifunction Switch C202a.
- Measure the resistance between the multifunction switch C202a-2, circuit 44 (LB), harness side and the electronic flasher C2047-1, circuit 44 (LB), harness side; and between the multifunction switch C202a-2, circuit 44 (LB), harness side and ground.
  
  Fig 4: Checking Circuit 44 (LB) For Open Or Short To Ground
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms between the multifunction switch and the electronic flasher, and greater than 10,000 ohms between the multifunction switch and ground?
Yes : GO to K5.

No : REPAIR the circuit. TEST the system for normal operation.
K5 CHECK CIRCUIT 385 (WH/RD) FOR A SHORT TO GROUND
- Measure the resistance between the multifunction switch C202a-3, circuit 385 (WH/RD), harness side and ground.
  
  Fig 5: Checking Circuit 385 (WH/RD) For Short To Ground
  Courtesy 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.
K6 CHECK THE MULTIFUNCTION SWITCH
- Carry out the multifunction switch component test. Refer to MULTIFUNCTION SWITCH, TURN PORTION for 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.