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Pinpoint Test K: The Brake Warning Indicator Is Never On

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. 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.
  1. K1 CARRY OUT THE INSTRUMENT CLUSTER OUTPUT STATE CONTROL USING THE SCAN TOOL 
    • Key in ON position.
    • Enter the following diagnostic mode on the diagnostic tool: Instrument Cluster Output State Control
    • Enter the instrument cluster output state control and select BRK_LAMP. Command the brake warning indicator on and observe the brake warning indicator.
    • Does the brake warning indicator illuminate when commanded on? 
    1. YES  : Go to  K2.
    2. NO  : Go to  K8.
  2. K2 CHECK THE INSTRUMENT CLUSTER PARKING BRAKE SWITCH PID 
    • 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 (INDICATOR INOPERATIVE) 
    • Disconnect: Parking Brake Switch C2015
    • Connect a fused (5A) jumper wire between the parking brake switch C2015-1, circuit 162 (LG/RD), harness side and the parking brake switch C2015-2, circuit 57 (BK), harness side.
      • Fig 1: Checking Parking Brake Switch (Indicator Inoperative)
      GF0004456Courtesy of FORD MOTOR CO.
    • Does the brake warning indicator illuminate? 
    1. YES  : INSTALL a new parking brake switch. TEST the system for normal operation.
    2. NO  : REMOVE the jumper wire. Go to  K4 .
  4. K4 CHECK THE PARKING BRAKE GROUND CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the parking brake switch C2015-2, circuit 57 (BK), harness side and ground.
      • Fig 2: Checking Circuit 57 (BK) For An Open (Parking Brake Switch)
      GF0004457Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  K5.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  5. K5 CHECK CIRCUIT 162 (LG/RD) FOR AN OPEN 
    • Disconnect: Instrument Cluster C220a
    • Measure the resistance between the instrument cluster C220a-24, circuit 162 (LG/RD), harness side and the parking brake switch C2015-1, circuit 162 (LG/RD), harness side.
      • Fig 3: Checking Circuit 162 (LG/RD) For An Open
      GF0004458Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : Go to  K8.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  6. K6 CHECK THE INSTRUMENT CLUSTER OPERATION USING THE SCAN TOOL 
    • Key in OFF position.
    • Disconnect: Brake Fluid Level Switch C124
    • Key in ON position.
    • Monitor the brake warning indicator.
    • Does the brake warning indicator illuminate? 
    1. YES  : Go to  K7.
    2. NO  : Go to  K8.
  7. K7 CHECK THE BRAKE FLUID LEVEL SWITCH GROUND CIRCUIT 57 (BK) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the brake fluid level switch C124-1, circuit 57 (BK), harness side and ground.
      • Fig 4: Checking Circuit 57 (BK) For Open
      GF0004459Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    1. YES  : INSTALL a new brake fluid level switch. REFER to HYDRAULIC BRAKE ACTUATION article. TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  8. K8 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION 
    • Disconnect all the instrument cluster connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the instrument cluster connectors and make sure they seat correctly.
    • Operate the system and verify that the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new instrument cluster. REFER to Instrument Cluster (IC)  in this 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.
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