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Home >> Ford >> 2005 >> Escape Hybrid, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 815 (Exterior Lighting System (F250-F550)) >> Diagnostic Tests >> Fog Lamps >> Pinpoint Tests >> Pinpoint Test S: The Fog Lamps Are Inoperative >> Pinpoint Test S: The Fog Lamps Are Inoperative

Pinpoint Test S: The Fog Lamps Are Inoperative

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adaptor(s) when making measurements. Failure to use the correct probe adaptor(s) may damage the connector.
  1. S1 CHECK THE PARKING LAMPS 
    • Verify the parking lamp operation.
    • Do the parking lamps operate correctly? 
    1. YES  : Go to  S2.
    2. NO  : REFER to Parking, Rear and License Plate Lamps  to continue diagnosis of the parking lamps.
  2. S2 CHECK THE HIGH BEAM INDICATOR OPERATION 
    • Check the operation of the high beam indicator.
    • Does the high beam indicator operate correctly? 
    1. YES  : Go to  S3.
    2. NO  : REFER to INSTRUMENT CLUSTER article to continue diagnosis of the high beam indicator.
  3. S3 CHECK HEADLAMP SWITCH OUTPUT 
    • Disconnect: CJB C270a
    • Key in ON position.
    • Place the headlamp switch in the PARKING LAMPS ON position and engage the fog lamp switch.
      • Fig 1: Checking Circuit For Voltage
      GF0008324Courtesy of FORD MOTOR CO.
    • Measure the voltage between the CJB C270a-17, circuit 275 (YE), harness side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : TURN the headlamp switch off. Go to  S6 .
    2. NO  : TURN the headlamp switch off. Go to  S4 .
  4. S4 CHECK CIRCUIT 275 (YE) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205a
      • Fig 2: Checking Circuit For Open
      GF0008325Courtesy of FORD MOTOR CO.
    • Measure the resistance between the CJB C270a-17, circuit 275 (YE), harness side and the headlamp switch C205a-5, circuit 275 (YE), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  S5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. S5 CHECK CIRCUIT 14 (BN) FOR AN OPEN 
      Fig 3: Checking Circuit For Open
      GF0008326Courtesy of FORD MOTOR CO.
    • Measure the resistance between the headlamp switch C205a-12, circuit 14 (BN), harness side and the headlamp switch C205a-2, circuit 14 (BN), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new headlamp switch. REFER to Headlamp Switch . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. S6 CHECK THE CJB 
    • Connect: CJB C270a
    • Disconnect: CJB C270h
    • Place the headlamp switch in the PARKING LAMPS ON position and engage the fog lamp switch.
      • Fig 4: Checking Circuit For Voltage
      GF0008327Courtesy of FORD MOTOR CO.
    • Measure the voltage between the CJB C270h pin 2, circuit 478 (TN/OG), component side and ground.
    • Is the voltage greater than 10 volts? 
    1. YES  : TURN the headlamp switch off. Go to  S8 .
    2. NO  : TURN the headlamp switch off. VERIFY the CJB fuse 43 (10A) is OK. If OK, go to  S7 .
  7. S7 CHECK CIRCUIT 12 (LG/BK) FOR AN OPEN 
    • Connect: CJB C270h
    • Disconnect: CJB C270a
      • Fig 5: Checking Circuit For Open
      GF0008328Courtesy of FORD MOTOR CO.
    • Measure the resistance between the CJB C270a-13, circuit 12 (LG/BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new CJB. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. S8 CHECK THE FOG LAMP GROUND 
    • Disconnect: Inoperative Fog Lamp
      • Fig 6: Checking Circuit For Ground
      GF0008329Courtesy of FORD MOTOR CO.
    • Measure the resistance between the LH fog lamp C152-1, circuit 57 (BK), harness side and ground; or between the RH fog lamp C162-1, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : REPAIR circuit 478 (TN/OG). TEST the system for normal operation.
    2. NO  : REPAIR circuit 57 (BK). TEST the system for normal operation.
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