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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 839 (Instrument Cluster System (F250-F550)) >> Diagnostic Tests >> Instrument Cluster (IC) >> Pinpoint Tests >> Pinpoint Test K: The Brake Warning Indicator is Never On >> Pinpoint Test K: The Brake Warning Indicator Is Never On

Pinpoint Test K: The Brake Warning Indicator Is Never On

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. K1 CARRY OUT THE INSTRUMENT CLUSTER WARNING LAMPS AND CHIME ACTIVE COMMAND USING THE SCAN TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Active Command
    • Select the instrument cluster warning lamps and chime active command on and off.
    • Does the brake warning indicator illuminate when selected on and turn off when selected off? 
    1. YES  : Go to  K2.
    2. NO  : Go to  K9.
  2. K2 CHECK THE PARKING BRAKE SWITCH PID USING THE SCAN TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster PID
    • Monitor the instrument cluster parking brake switch PID while applying the parking brake.
    • Does the PID agree with the parking brake position? 
    1. YES  : Go to  K6.
    2. NO  : Go to  K3.
  3. K3 CHECK THE PARKING BRAKE SWITCH INPUT 
    • Key in OFF position.
    • Disconnect: Parking Brake Switch C2015
      • Fig 1: Connecting Fused Jumper Wire
      GF0008169Courtesy of FORD MOTOR CO.
    • Connect a fused (5A) jumper wire between the parking brake switch C2015-1, circuit 162 (LG/RD), harness side and ground.
    • Key in ON position.
    • Does the brake warning indicator illuminate? 
    1. YES  : REMOVE the jumper wire. Go to  K4 .
    2. NO  : REMOVE the jumper wire. Go to  K5 .
  4. K4 CHECK CIRCUIT 676 (PK/OG) FOR AN OPEN 
    • Key in OFF position.
      • Fig 2: Checking Circuit For Open
      GF0004457Courtesy of FORD MOTOR CO.
    • Measure the resistance between the parking brake switch C2015-2, circuit 676 (PK/OG), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new parking brake switch. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. K5 CHECK CIRCUIT 162 (LG/RD) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b
      • Fig 3: Checking Circuit For Open
      GF0008170Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster C220b-18, circuit 162 (LG/RD), harness side and the parking brake switch C2105-1, circuit 162 (LG/RD), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  K9.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. K6 CHECK THE BRAKE FLUID LEVEL SWITCH FOR CORRECT OPERATION 
    • Disconnect: Brake Fluid Level Switch C124
    • Key in ON position.
    • Check the brake warning indicator for illumination.
    • Does the brake warning indicator illuminate? 
    1. YES  : Go to  K8.
    2. NO  : Go to  K7.
  7. K7 CHECK THE CIRCUITS 531 (DG/YE) AND 512 (TN/LG) FOR SHORT TOGETHER 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b
      • Fig 4: Checking Circuits For Short Together
      GF0008171Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster C220b-1, circuit 531 (DG/YE), harness side and the instrument cluster C220b-14, circuit 512 (TN/LG), harness side.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  K9.
    2. NO  : REPAIR the circuits. TEST the system for normal operation.
  8. K8 CHECK CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Brake Fluid Level Switch C124
      • Fig 5: Checking Circuit For Open
      GF0004459Courtesy of FORD MOTOR CO.
    • Measure the resistance between the brake fluid level switch C124-1, circuit 57 (BK), harness side and ground.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new brake fluid level switch. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  9. K9 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Correct all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify that concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster. REFER to Instrument Cluster (IC) . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.
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