Normal Operation
The operating voltage required to supply the ABS module, hydraulic pump, and isolation valves is in a range between 10 and 17 volts.
Voltage is supplied by circuit 20-CF6A (PK/YE) (ignition feed) and circuit 30-CF13 (RD) (power hot at all times). Ground is provided through circuit 31-CF6A (BK/YE) and 31-CF6B (BK/YE).
The operating voltage required to supply the pedal travel switch (PTS) switch is 5 volts through circuit 7-CF65 (YE/VT).
The PTS signal is sent through circuit 8-CF65 (WH/VT) to the ABS module.
Ground is provided through circuit 9-CF65 (BN/WH).
The vehicle electrical system supplies 12 volts to the ABS module.
Voltage is supplied by circuit 20-CF6A (PK/YE) (ignition feed) and circuit 30-CF13 (RD) (power hot at all times). Ground is provided through circuit 31-CF6A (BK/YE) and 31-CF6B (BK/YE).
The operating voltage required to run the hydraulic pump motor is in a range between 10 and 17 volts.
Voltage is supplied by circuit 30-CF13 (RD) (power hot at all times). Ground is provided through circuit 31-CF6A (BK/YE) and 31-CF6B (BK/YE).
The active wheel speed sensor generates a square wave signal that is sent to the ABS module. The wheel speed sensor circuitry connects to the ABS module connector C135 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 through the right front wheel speed sensor and its circuitry to determine if they are functional.
Twelve volts are supplied to the active wheel speed sensors from the ABS module. The wheel speed sensor ground is supplied by the ABS module.
The wheel speed sensor and sensor ring generate a square wave signal to the ABS module that is proportional to wheel speed. The ABS module compares wheel speed inputs from all wheel speed sensors to determine an impending wheel lockup.
The steering wheel rotation sensor monitors the steering wheel position when the toothed-wheel on the steering shaft passes through its magnetic field.
Steering wheel rotation (in degrees) is sent to the ABS module through circuit 8-CC18 (WH/RD) and circuit 10-CC17 (GY). Voltage is supplied by the ABS module through circuit 7-CC1 (YE/RD). Ground is provided by the ABS module through circuit 9-CC1 (BN/RD).
The accelerometer (lateral and longitudinal-4x4) and the yaw rate sensor are contained in the sensor cluster. The sensor measures the vehicle acceleration and yaw rate then sends the signal via CAN communication wires to the ABS module.
Voltage is supplied by circuit 7-CC1 (YE/RD). Ground is provided through circuit 9-CF67 (BN/RD). The CAN communication is transmitted through circuit 8-CF66 (WH/BU) and circuit 9-CF66 (BN/BU).
The active brake booster has internal solenoids that assist driver brake applications or can apply the brakes when needed if the vehicle loses control.
Power is supplied by circuit 8-CF68 (WH/RD). Ground is provided through circuit 9-CF68 (BN/RD).
The active brake booster has a normally open (NO), and a normally closed, (NC) pedal force switch that operates according to driver brake applications.
The NO pedal force switch circuit is 8-CF51 (WH/GN). The NC pedal force switch circuit is 10-CF51 (GY/OG).
The brake pressure transducer sends current to the ABS module proportional to the driver's brake pedal application.
Reference voltage is supplied by circuit 7-CF64 (YE/BK). Ground is provided through circuit 9-CF64 (BN/YE). The transducer current is supplied by circuit 8-CF64 (WH/BK).
The 5-volt reference voltage is supplied by the Anti-Lock Brake Module (ABS).
Reference voltage is supplied by circuit 7-CF64 (YE/BK). The reference voltage circuit returns to the ABS module through the PTS switch circuit 9-CF65 (BN/WH) and the brake pressure transducer circuit 9-CF64 (BN/YE).
The 12-volt driver brake apply (DBA) signal is sent from the ABS module during brake application to the trailer tow relay (if equipped).
Voltage is supplied by circuit 29S -CF2 (OG/BU).
Engine torque modulation is achieved by regulating fuel and spark to the cylinders. The Advance Trac®/IVD system operates using the ABS module to interact with the PCM to reduce engine torque if one or both rear wheels lose traction and begin to spin during acceleration.
Voltage is supplied by circuit 20-CF54 (PK/WH).
The traction control switch is a momentary switch and when pressed, disables or enables the traction control or Advance Trac®/IVD.
Voltage to the traction control switch is supplied by circuit 8-CF54 (WH/VT). The switch illumination off circuit is31S-CF45(BK/GN).
The pressure transducer transforms brake fluid pressures in the master cylinder to an electrical signal which the ABS module receives through circuit 8-CF64 (WH/BK). The transducer receives a five-volt reference from the ABS module through circuit 7-CF64 (YE/BK). Circuit 9-CF64 (BN/YE) provides ground for the transducer.
The traction control switch is a momentary switch and when pressed, disables or enables the traction control or Advance Trac®/IVD.
Power is supplied by circuit 20-CF54 (PK/WH). Circuit 8-CF54 (WH/VT) provides the switch input signal to the ABS module. Current to the disable LED lamp from the ABS module is supplied by circuit 31S-CF45 (BK/GN).
The Advance Trac®/IVD system needs to be recalibrated whenever a component specific to the system is disconnected or a new component is installed.
The yaw rate sensor and accelerometer are part of the sensor cluster which sends various signals about the vehicle's dynamics through a two-wire bus CAN HI 8-CF66 (WH/BU) and CAN LOW 9-CF66 (BN/BU). The CAN bus receives a twelve-volt input through circuit 7-CF67 (YE/RD) in series with the steering wheel rotation sensor circuitry. Ground is provided through circuit 9-CF67 (BN/RD).