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Home › Ford › 2019 › Mustang EcoBoost, 2D Convertible, Automatic Trans › Repair and Diagnosis › Brakes › Brakes Control Systems › Abs Guided Routine › Pinpoint Tests › Pinpoint Tests BS: Brake Wear Lining Sensor Fault › Possible Causes

Possible Causes

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may cause damage to the connector.
  1. BS1: CHECK THE BCM BRAKE LINING WEAR SENSOR CIRCUIT FOR AN OPEN 
    • Ignition OFF.
    • BCM_C connector disconnected.
    • Left Front Brake Pad Wear Indicator Switch connector disconnected.
    • Left Rear Brake Pad Wear Indicator Switch connector disconnected.
    • Measure the resistance between:
    (+) BCM_C Connector, Harness Side (-) Left Rear Brake Pad Wear Indicator Switch Connector, Harness Side
    BP_WI BP_WI
    • Is the resistance less than 3 Ohm?
    Yes No
    Go to  BS2. REPAIR the circuit.
  2. BS2: CHECK THE REAR SENSOR TO FRONT SENSOR CIRCUIT FOR AN OPEN 
    • Measure the resistance between:
    (+) Left Rear Brake Pad Wear Indicator Switch Connector, Harness Side (-) Left Rear Brake Pad Wear Indicator Switch Connector, Harness Side
    GND BP_WI
    • Is the resistance less than 3 Ohm?
    Yes No
    Go to  BS3. REPAIR the circuit.
  3. BS3: CHECK THE FRONT SENSOR GROUND CIRCUIT FOR AN OPEN 
    • Measure the resistance between:
    (+) Left Front Brake Pad Wear Indicator Switch Connector, Harness Side (-)
    GND Ground
    • Is the resistance less than 3 Ohm?
    Yes No
    Go to  BS4. REPAIR the circuit.
  4. BS4: CHECK THE BRAKE LINING WEAR SENSORS FOR AN OPEN 
(+) Left Rear Brake Pad Wear Indicator Switch Connector, Component Side (-) Left Rear Brake Pad Wear Indicator Switch Connector, Component Side
BP_WI GND
(+) Left Front Brake Pad Wear Indicator Switch Connector, Component Side (-) Left Front Brake Pad Wear Indicator Switch Connector, Component Side
BP_WI GND
Yes No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
INSPECT all disconnected electrical connectors for corrosion, spread terminals, pushed-out pins, damaged pins or bent pins. REPAIR as necessary. Refer to Wiring Diagrams Cell 5, for schematic and connector information.		 Install a new brake lining wear indicator or indicators as necessary. REFER to appropriate service information.
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