Possible Causes

• Wiring, terminals or connectors
• Brake pad wear indicator

Fig 1: Body Control Module-C (BCM-C) Connector End View (C2280C)

Courtesy of FORD MOTOR COMPANY

Harness Side

1. BS1: CHECK THE BCM BRAKE LINING WEAR SENSOR CIRCUIT FOR AN OPEN 
   • Ignition OFF.
   • BCM_C connector disconnected. (C2280C)
   • Left Front Brake Pad Wear Indicator Switch connector disconnected.
   • Left Rear Brake Pad Wear Indicator Switch connector disconnected.
   • Measure the resistance between:

     (+) BCM_C (C2280C) 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 
   • Measure the resistance between:

     (+) Left Rear Brake Pad Wear Indicator Switch Connector, Component Side	(-) Left Rear Brake Pad Wear Indicator Switch Connector, Component Side
     BP WI	GND

   • Measure the resistance between:

     (+) Left Front Brake Pad Wear Indicator Switch Connector, Component Side	(-) Left Front Brake Pad Wear Indicator Switch Connector, Component Side
     BP WI	GND

   • Are the resistances less than 3 ohms? 

   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 OEM CONNECTOR REPAIR PROCEDURES (EXCEPT ELECTRIC) , for schematic and connector information.	Install a new brake lining wear indicator or indicators as necessary. REFER to DRUM BRAKE (EXCEPT ELECTRIC) or REAR DISC BRAKE (EXCEPT ELECTRIC) .