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Pinpoint Test F: DTC C1446 - Brake Fluid Level Low/Brake Switch Circuit Failure

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. F1 CHECK THE BRAKE FLUID LEVEL 
    • Verify the brake fluid level in the master cylinder reservoir is at the correct level.
    • Is the brake fluid level OK? 
    1. YES  : Go to  F2.
    2. NO  : ADJUST the fluid level as necessary. CLEAR the DTC. REPEAT the self-test.
  2. F2 CHECK THE RED BRAKE WARNING INDICATOR OPERATION 
    • Monitor the red brake warning indicator in the instrument cluster.
    • Key in ON position.
    • Verify the red brake warning indicator illuminates for a few seconds and then extinguishes.
    • Does the red brake warning indicator illuminate for a few seconds and then extinguish? 
    1. YES  : Go to  F3.
    2. NO  : REFER to INSTRUMENT CLUSTER (IC) AND WARNING CHIMES article to diagnose the red brake warning indicator.
  3. F3 CHECK THE STOPLAMP OPERATION 
    • Verify the stoplamp operate correctly while pressing and releasing the brake pedal.
    • Do the stoplamp operate correctly? 
    1. YES  : Go to  F4.
    2. NO  : REFER to EXTERIOR LIGHTING article to diagnose the stoplamp.
  4. F4 CHECK THE ABS MODULE FOR DTCs 
    • Connect the diagnostic tool.
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Self Test ABS Module
    • Retrieve and record the ABS module DTCs.
    • Are any communication (U-code) DTCs present? 
    1. YES  : Go to the ABS Module DTC Chart and diagnose the U-code DTCs.
    2. NO  : Go to  F5.
  5. F5 CHECK THE PCM FOR DTCs 
    • Enter the following diagnostic mode on the diagnostic tool: Self Test PCM
    • Retrieve and record the PCM DTCs.
    • Are any DTCs present? 
    1. YES  : REFER to the Master DTC Chart in MULTIFUNCTION ELECTRONIC MODULES article.
    2. NO  : Go to  F6.
  6. F6 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all instrument cluster connectors.
    • Check the connectors for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect all instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster module. REFER to INSTRUMENT CLUSTER (IC) AND WARNING CHIMES article. CLEAR the DTCs. REPEAT the self-test.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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