The EBCM supplies 5 V to the yaw-rate sensor assembly reference circuit and a ground through the yaw-rate sensor low reference circuit, which is shared with the steering angle sensor. The EBCM, yaw-rate sensor assembly and steering angle sensor share a common12 V supply voltage circuit.

The yaw-rate sensor produces signal output voltage that corresponds to the vehicle rotation around its vertical axis.

This diagnostic procedure supports DTC C0292.

VSES (Vehicle Stability Enharcement System) combination sensor circuits.

The ignition is switched on.

If the EBCM detects a fault in the yaw-rate signal voltage output.

The following number refers to the step number in the diagnostic table:

The steering angle sensor shares a 12 V ignition supply voltage with the EBCM and the yaw-rate sensor. The EBCM applies a ground to the steering angle sensor low reference circuit, which is shared with the yaw-rate sensor.

The steering angle sensor provides a serial data signal output to the EBCM that represents the steering wheel degree of rotation. The EBCM utilises this signal to calculate the driver intended driving direction.

This diagnostic procedure supports DTC C0460 - Steering Position Sensor.

An electrical fault in the shared electrical circuits may trigger DTCs on the components or sensors that shares in the faulty shared circuit. Test the electrical circuit of the appropriate sensors or components to isolate the fault.

The ignition is switched on.

If the EBCM detects the following steering angle sensor fault,

The following numbers refer to the step numbers in the diagnostic table:

The internal fault detection is handled inside the control module. No external circuits are involved.

This diagnostic procedure supports the following DTC:

DTC C0550 Electronic Control Unit (ECU) Performance

The microprocessor runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

If equipped, the following module specific actions may occur:

The electronic brake control module (EBCM) learns the model options that it is installed in by using the Vehicle ID information from the body control module (BCM) via the class 2 serial data line. Each time the vehicle is in the RUN position the BCM communicates this information via class 2. The EBCM internally compares the VIN and option information with that information stored in the BCM.

This diagnostic procedure supports:

DTC C0551 Option Configuration Error

If equipped, the following actions occur:

The electronic brake control module (EBCM) disables the traction control when other electronic control modules set DTCs for components that effect the operation of the Traction Control System (TCS).

This diagnostic procedure supports the following DTC:

DTC C0561 System Disabled Information Stored

This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information.

The body control module (BCM) diagnoses a condition preventing the engine control portion of the traction control function and sends a serial data message to the EBCM indicating that torque reduction is not allowed. The BCM will typically set a DTC and the EBCM will set this DTC.

This DTC is for information only. As an aid to the technician, this DTC indicates that there are no problems in the ABS/TCS system.

The electronic brake control module(EBCM) is the control centre is the ABS-TCS / ESP. The programming and calibration needed by the EBCM to control the operation of the ABS-TCS / ESP are stored in the EBCM's read only memory (ROM). The EBCM constantly performs a self-test that detects and isolates ABS-TCS / ESP faults.

This diagnostic procedure supports DTC C0569 - System Configuration Error.

The ignition is switched on.

If the EBCM system configuration doesn't match the vehicle system configuration.

The following number refers to the step number in the diagnostic table:

The electronic brake control module (EBCM) monitors the voltage level available for system operation. A low voltage condition prevents the system from operating properly.

This diagnostic procedure supports:

DTC C0899 Device Voltage Low

If equipped, the following actions occur:

The electronic brake control module (EBCM) monitors the voltage level available for system operation. If the voltage level is too high, damage may result in the system. When the EBCM detects a high voltage condition, the EBCM turns OFF the system relay which removes battery voltage from the solenoid valves and pump motor.

This diagnostic procedure supports the following DTC:

DTC C0900 Device Voltage High

The vehicle speed is greater than 8 km/h (5 mph).

The system voltage is greater than 17 volts for 0.72 seconds.

If equipped, the following actions occur:

A possible cause of this DTC is overcharging.

Modules connected to the high speed GMLAN serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module.

This diagnostic procdure supports the following DTCs :

A supervised periodic message that includes the transmitter module availability has not been received.

The module uses a default value for the missing parameter.

Modules connected to the GMLAN serial data circuit monitor for serial data communications on the GMLAN network during normal vehicle operation. Operating information and commands are exchanged among the modules. The body control module (BCM) maintains a transmit error counter (TEC) and a receive error counter (REC). The counter values increase with detected errors and will decrease with error-free messages.

This diagnostic procedure supports the following DTC:

A certain number of no valid transmitted messages on the GMLAN serial data circuits are detected by the module. The engine will not start when there is a total malfunction of the high speed GMLAN serial data circuits while the engine is not running. The following conditions may cause a total loss of high speed GMLAN data communication:

The BCM can set this DTC as current because it is the gateway between the class 2 and high speed GMLAN serial data circuits, and the BCM diagnostics is performed on class 2 data link.

The high speed GMLAN serial data bus uses two 120 ohms terminating resistors that are in parallel with the high speed GMLAN (+) and (-) circuits. One of the resistors is connected at the BCM and the other is at the engine control module (ECM). When testing for a short between high speed GMLAN (+) and (-) a reading of 60 ohms is normal. If the high speed GMLAN serial data is open testing the resistance between high speed GMLAN (+) and (-) will read about 120 ohms.