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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 L: The Brake Warning Indicator is Always On >> Pinpoint Test L: The Brake Warning Indicator Is Always On

Pinpoint Test L: The Brake Warning Indicator Is Always 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. L1 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 and releasing the parking brake.
    • Does the PID agree with the parking brake position? 
    1. YES  : Go to  L4.
    2. NO  : Go to  L2.
  2. L2 CHECK THE PARKING BRAKE SWITCH INPUT 
    • Key in OFF position.
    • Disconnect: Parking Brake Switch C2015
    • Key in ON position.
    • Monitor the brake warning indicator with the parking brake switch disconnected.
    • Does the brake warning indicator turn off? 
    1. YES  : INSTALL a new parking brake switch. TEST the system for normal operation.
    2. NO  : Go to  L3 .
  3. L3 CHECK CIRCUIT 162 (LG/RD) FOR A SHORT TO GROUND 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b
      • Fig 1: Checking Circuit For Short To Ground
      GF0008172Courtesy of FORD MOTOR CO.
    • Measure the resistance between the parking brake switch C2105-1, circuit 162 (LG/RD), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  L9.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. L4 CHECK THE BRAKE FLUID LEVEL SWITCH FOR CORRECT OPERATION 
    • Disconnect: Brake Fluid Level Switch C124
      • Fig 2: Connecting Fused Jumper Wire
      GF0008173Courtesy of FORD MOTOR CO.
    • Connect a fused (5A) jumper wire between the brake fluid level switch C124-2, circuit 512 (TN/LG), harness side and the brake fluid level switch C124-3, circuit 531 (DG/YE), harness side.
    • Key in ON position.
    • Does the brake warning indicator turn off? 
    1. YES  : VERIFY the brake fluid level is above the minimum level. If OK, INSTALL a new brake fluid level switch. TEST the system for normal operation.
    2. NO  : REMOVE the jumper wire. Go to  L5 .
  5. L5 CHECK CIRCUIT 512 (TN/OG) FOR A SHORT TO VOLTAGE 
    • Key in OFF position.
    • Disconnect: Instrument Cluster C220b
    • Key in ON position.
      • Fig 3: Checking Circuit For Voltage
      GF0008174Courtesy of FORD MOTOR CO.
    • Measure the voltage between the instrument cluster C220b-14, circuit 512 (TN/LG), harness side and ground.
    • Is any voltage present? 
    1. YES  : Go to  L6.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. L6 CHECK CIRCUITS 512 (TN/OG) AND 531 (DG/YE) FOR AN OPEN 
    • Key in OFF position.
      • Fig 4: Checking Circuits For Open
      GF0008175Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster C220b-14, circuit 512 (TN/LG), harness side and the brake fluid level switch C124-2, circuit 512 (TN/LG), harness side; and between the instrument cluster C220b-1, circuit 531 (DG/YE), harness side the brake fluid level switch C124-3, circuit 531 (DG/YE), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  L7.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  7. L7 CHECK CIRCUIT 512 (TN/LG) FOR A SHORT TO GROUND 
      Fig 5: Checking Circuit For Short To Ground
      GF0008176Courtesy of FORD MOTOR CO.
    • Measure the resistance between the instrument cluster C220b-14, circuit 512 (TN/LG), harness side and ground.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  L8.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. L8 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  L10.
    2. NO  : Go to  L9.
  9. L9 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.
  10. L10 CHECK FOR CORRECT ABS OPERATION 
    • Disconnect the ABS module connector.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Correct the ABS module connector and make sure it seats correctly.
    • Operate the system and verify that concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new ABS module. REFER to VEHICLE DYNAMIC SYSTEMS article. 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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