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Pinpoint Test Q: An Individual Fog Lamp Is Inoperative

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Make sure the fog lamp bulb is good before continuing diagnostics.
  1. Q1 CHECK CIRCUIT 1205 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Inoperative Fog Lamp
    • Disconnect: BEC C1035c
      • Fig 1: Checking Circuit 1205 (BK) For Open - 4.0L Or 4.6L
      GF0001381Courtesy of FORD MOTOR CO.
    • For 4.0L or 4.6L, measure the resistance between the LH fog lamp C152-2, circuit 1205 (BK), harness side and the BEC C1035c-E10, circuit 1205 (BK), harness side; or between the RH fog lamp C162-2, circuit 1205 (BK), harness side and the BEC C1035c-C11, circuit 1205 (BK), harness side.
      • Fig 2: Checking Circuit 1205 (BK) For Open - 5.4L
      GF0046550Courtesy of FORD MOTOR CO.
    • For 5.4L, measure the resistance between the LH fog lamp C1322-B, circuit 1205 (BK), harness side and the BEC C1035c-E10, circuit 1205 (BK), harness side; or between the RH fog lamp C1323-B, circuit 1205 (BK), harness side and the BEC C1035c-C11, circuit 1205 (BK), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  Q2.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  2. Q2 CHECK CIRCUIT 1776 (TN/OG) OR CIRCUIT 1721 (LB/BK) FOR AN OPEN 
      Fig 3: Checking Circuit 1776 (TN/OG) Or Circuit 1721 (LB/BK) For Open - 4.0L Or 4.6L
      GF0016137Courtesy of FORD MOTOR CO.
    • For 4.0L or 4.6L, measure the resistance between the LH fog lamp C152-1, circuit 1721 (LB/BK), harness side and the BEC C1035c-B5, circuit 1721 (LB/BK), harness side; or between the RH fog lamp C162-1, circuit 1776 (TN/OG), harness side and the BEC C1035c-E7, circuit 1776 (TN/OG), harness side.
      • Fig 4: Checking Circuit 1776 (TN/OG) Or Circuit 1721 (LB/BK) For Open - 5.4L
      GF0046551Courtesy of FORD MOTOR CO.
    • For 5.4L, measure the resistance between the LH fog lamp C1322-A, circuit 1721 (LB/BK), harness side and the BEC C1035c-B5, circuit 1721 (LB/BK), harness side; or between the RH fog lamp C1323-A, circuit 1776 (TN/OG), harness side and the BEC C1035c-E7, circuit 1776 (TN/OG), harness side.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new BEC. TEST the system for normal operation.
    2. NO  : REPAIR the circuit in question. TEST the system for normal operation.
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