N: C1145, C1155, C1165 and C1175 - Wheel Speed Sensor Input Circuit Failure

PINPOINT TEST N: DTCs C1145, C1155, C1165 AND C1175 - WHEEL SPEED SENSOR INPUT CIRCUIT FAILURE

Normal Operation
The front wheel speed sensors generate a AC (sinusoidal) signal to the anti-lock brake module. The rear active wheel speed sensors generate a square wave signal that is sent to the anti-lock brake system (ABS) module. The wheel speed sensor circuitry connects to the ABS module through 2 wires and a connector at each wheel speed sensor. When the ignition is turned to the RUN position, the ABS module carries out a self-test to determine if the sensors are functional.

The ABS module sends a 5 volt reference to the front sensors and its circuitry and battery voltage to the rear active wheel speed sensors and its circuitry.

Possible Causes
^ Wheel speed sensor ring
^ Wheel speed sensors
^ Circuit 514 (YE/RD) open, short to voltage or ground
^ Circuit 516 (YE/BK) open, short to voltage or ground
^ Circuit 518 (LG/RD) open, short to voltage or ground
^ Circuit 519 (LG/BK) open, short to voltage or ground
^ Circuit 521 (TN/OG) open, short to voltage or ground
^ Circuit 522 (TN/BK) open, short to voltage or ground
^ Circuit 523 (RD/PK) open, short to voltage or ground
^ Circuit 524 (PK/BK) open, short to voltage or ground
^ ABS module
^ Connector water intrusion

N1-N2:

N2-N4:

N4-N6:

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