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Pinpoint Test G: DTC C1187 - Brake Fluid Level Input Circuit Open

WARNING: This page is about a different car, the 2007 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.
  1. G1 CHECK ABS MODULE OPERATION 
    • Disconnect: Brake Fluid Level Switch C124
    • Connect a fused (10A) jumper wire between the brake fluid level switch C124-2, circuit CMC19 (GY/VT), harness side and the brake fluid level switch C124-3, circuit RCM19 (YE/GY), harness side.
    • Connect the diagnostic tool.
    • Key in ON position.
    • Using the scan tool, clear the DTCs and repeat the self-test with the brake pedal not applied. Retrieve the DTCs.
    • Is DTC C1187 retrieved again? 
    1. YES  : Go to  G2.
    2. NO  : INSTALL a new brake fluid reservoir. REFER to BRAKE SYSTEM - GENERAL INFORMATION . CLEAR the DTCs and REPEAT the self-test with the brake pedal not applied.
  2. G2 CHECK CIRCUIT CMC19 (GY/VT) AND RMC19 (YE/GY) FOR AN OPEN 
    • Key in OFF position.
    • Disconnect: Anti-Lock Brake System (ABS) Module C135
    • Measure the resistance between:
      • ABS module C135-25, circuit CMC19 (GY/VT), harness side and brake fluid level switch C124-2, circuit CMC19 (GY/VT), harness side.
      • ABS module C135-23, circuit RCM19 (YE/GY), harness side and brake fluid level switch C124-3, circuit RCM19 (YE/GY), harness side.
    • Are the resistances less than 5 ohms? 
    1. YES  : Go to  G3.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test with the brake pedal not applied.
  3. G3 CHECK CIRCUIT CMC19 (GY/VT) AND RCM19 (YE/GY) FOR A SHORT TO GROUND 
    • Measure the resistance between ground and:
      • ABS module C135-25, circuit CMC (GY/VT), harness side.
      • ABS module C135-23, circuit RCM19 (YE/GY), harness side.
    • Is the resistance greater than 10,000 ohms? 
    1. YES  : Go to  G4.
    2. NO  : REPAIR the affected circuit(s). CLEAR the DTCs. REPEAT the self-test with the brake pedal not applied.
  4. G4 CHECK FOR CORRECT ABS MODULE OPERATION 
    • Disconnect all ABS connectors.
    • Check for:
      • corrosion.
      • pushed-out pins.
      • spread terminals.
    • Connect all ABS connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. YES  : INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module . TEST the system for normal operation.
    2. NO  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test with the brake pedal not applied.
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