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Tests/Procedures: Potential Causes: Tech Tips: 1. Unplug the Vehicle Speed Sensor (VSS) in the rear differential. 2. Check the voltage on the Pink/Orange wire in the VSS connector. The Body Control Module (BCM) sends B+ out to the sensor on the Pink/Orange wire at pin 21 in the C2 connector of the Body Control Module (BCM) . 3. Check the resistance of the Dark Green/Orange wire to ground. It should be 100- 300 ohms. The BCM has a resistor to ground to lower the current flow in the circuit. 4. If both wires are OK, replace the VSS. Body Control Module (BCM) Vehicle Speed Sensor (VSS) Wiring Vehicles with ABS get the VSS signal from the same sensor but the signal first goes to the Controller Anti-lock Brakes (CAB) and then to the Body Control Module (BCM) and then to the Powertrain Control Module (PCM). Confirmed Fix 2 2 2 1 – - – - Vehicle Speed Sensor (VSS) Connector Vehicle Speed Sensor (VSS) Wiring Wiring Rear Wheel Speed Sensor

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Pinpoint Test E: DTC C1145 (RF), DTC C1155 (LF), DTC C1230 (Rear) — Wheel Speed Sensor Input Circuit Failure Normal Operation The active wheel speed sensor generates 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 two 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 by sending a reference voltage to all of the wheel speed sensors and its circuitry to determine if they are functional. Battery voltage and a ground signal are supplied to the wheel speed sensors from the ABS module. Possible Causes wheel speed sensor circuit 514 (YE/RD) open, short to power, or short to ground circuit 516 (YE/BK) open, short to power, or short to ground circuit 518 (LG/RD) open, short to power, or short to ground

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See ANTI-LOCK BRAKE SAFETY PRECAUTIONS article in GENERAL INFORMATION. The Anti-Lock Brake System (ABS) control module senses reductions in front and rear wheel speed and modulates hydraulic pressure to the brakes to prevent wheel lock-up. The ABS consists of a hydraulic unit, 4 wheel speed sensors and sensor rotors, ABS relay (fail-safe relay and motor relay), pump motor and ABS control module. See Fig. 1. An ABS warning light is located on the instrument cluster. For more information on brake system, see BRAKE SYSTEM article. Fig. 1: Locating ABS Components (Typical) Application ABS Control Module Under Passenger Seat ABS Relay Left Front Of Engine Compartment Data Link Connector Left Side Of Engine Compartment Hydraulic Unit Left Side Of Engine Compartment Pump Motor On Hydraulic Unit

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Fault Fault location Code 1-1 At start of sequence 2-6 (BPP)Brake pedal position switch 2-7 In system relay, when ignition is off the ECU supply is continuous. 2-8 In system relay, there is no solenoid valve supply. 2-12 Is an air gap, right hand front wheel speed sensor. 2-13 Is an air gap, left hand rear wheel speed sensor. 2-14 Is an air gap, left hand front wheel speed sensor. 2-15 Is an air gap, right hand rear wheel speed sensor 3-0 The ECU connection/wiring to right hand front inlet, hydraulic modulator solenoid valve.
3-1 The ECU connection or wiring to right hand front outlet, hydraulic modulator solenoid valve.