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Pinpoint Test G: Flash Code 2 - STOPLAMP Switch Circuit Failure

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. 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. G1 CHECK THE STOPLAMP OPERATION 
    • Apply and release the brake pedal while observing the stoplamps.
    • Do the stoplamps operate correctly?  
    1. YES  : Go to  G2.
    2. NO  : REFER to EXTERIOR LIGHTING article.
  2. G2 CHECK THE STOPLAMP BULBS 
    • Check the stoplamps for the presence of aftermarket LED lights.
    • Are the correct stoplamp bulbs installed?  
    1. YES  : Go to  G3.
    2. NO  : INSTALL the correct stoplamp bulbs. TEST the system for normal operation.
  3. G3 CHECK CIRCUIT 511 (LG) FOR AN OPEN 
    • Disconnect: Speed Control Actuator C122
      • Fig 1: Checking Circuit For Open
      GF0025543Courtesy of FORD MOTOR CO.
    • While applying the brake pedal, measure the voltage between the speed control actuator C122-4, circuit 511 (LG), harness side and ground.
    • Is the voltage greater than 10 volts?  
    1. YES  : INSTALL a new speed control actuator. REFER to Speed Control Actuator . REPEAT the self-test.
    2. NO  : REPAIR the circuit. REPEAT the self-test.
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