Test G: DTC C1187 - Brake Fluid Level Input Circuit Open
PINPOINT TEST G: DTC C1187 - BRAKE FLUID LEVEL INPUT CIRCUIT OPENRefer to Vehicle/Diagrams, Vehicle Dynamic Systems for schematic and connector information.
Normal Operation
The anti-lock brake system (ABS) module sends out a reference voltage to the brake fluid level switch along circuit RCM19 (YE/GY). This voltage is returned to the ABS module along circuit CMC19 (GY/VT) when the brake fluid is at the correct level or sent to ground along circuit GD121 (BK/YE) when the fluid goes below a certain level.
Possible Causes
^ Circuit open
^ Circuit shorted
^ Brake fluid level switch (integral to the brake fluid reservoir)
^ ABS module
G1-G4:
