Antilock Brake System Buick Enclave I

Fastener Tightening Specifications

Fastener Tightening Specifications

Scheme 1

Scheme 2

Scheme 3

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Mechanical Fault Table

Circuit/System Description

The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides a DC square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed.

Conditions for Running the DTC

C0035 00-C0050 00

1. Ignition ON.
2. Ignition voltage is greater than 9.5 V.

C0035 5A-C0050 5A

1. Ignition ON.
2. Ignition voltage is greater than 9.5 V.
3. The brake pedal is not pressed.
4. A DTC is not set for the other wheel speed sensor on the same axle.

Conditions for Setting the DTC

C0035 00-C0050 00

1. A short to ground, or an open/high resistance is detected on the wheel speed sensor 12 V reference circuit.
2. A short to voltage, short to ground or an open/high resistance is detected on the signal circuit.
3. Wheel speed sensor power supply is less than 7.6 V.
4. A missing wheel speed sensor signal.

C0035 5A-C0050 5A

An erratic signal output of the wheel speed sensor is detected.

Actions Taken when the DTC Sets

1. The EBCM disables the antilock brake system (ABS), traction control system and vehicle stability enhancement system for the duration of the ignition cycle.
2. The ABS indicator illuminates.
3. The Stabilitrak indicator illuminates.
4. The EBCM disables the voltage to the wheel speed sensor the fault is detected on.

Conditions for Clearing the DTC

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

Diagnostic Aids

1. Do not use a magnet to clean the encoder ring.
2. Inspect the wheel hub bearing encoder ring for rust or corrosion.
3. If two or more wheel speed sensors are inoperative, diagnose each wheel speed sensor individually.
4. If the customer comments that the ABS indicator is ON only during moist environmental conditions (rain, snow, vehicle wash, etc.), inspect the wheel speed sensor wiring for signs of water intrusion.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).

Circuit/System Testing

Note. If any of the symptom codes 0F, 18 or 5A are set, refer to the Diagnostic Fault Information table for possible mechanical faults or conditions.

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 V between the 12 V reference circuit terminal of the appropriate sensor listed below and ground. Left front sensor circuit terminal 21 Right front sensor circuit terminal 18 Left rear sensor circuit terminal 33 Right rear sensor circuit terminal 19 If greater than the specified range, test the 12 V reference circuit for a short to voltage.
3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground. Left front sensor circuit terminal 34 Right front sensor circuit terminal 6 Left rear sensor circuit terminal 20 Right rear sensor circuit terminal 31 If greater than the specified range, test the signal circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the 12 V reference terminal of the appropriate sensor circuit listed below and ground. Left front sensor circuit terminal 21 Right front sensor circuit terminal 18 Left rear sensor circuit terminal 33 Right rear sensor circuit terminal 19 If less than the specified value, test the 12 V reference circuit for a short to ground.
5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor circuit listed below and ground. Left front sensor circuit terminal 34 Right front sensor circuit terminal 6 Left rear sensor circuit terminal 20 Right rear sensor circuit terminal 31 If less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Test for less than 2 ohms between the appropriate 12 V reference circuit terminals listed below. Left front sensor circuit terminal 21 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector Right front sensor circuit terminal 18 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector Left rear sensor circuit terminal 33 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector Right rear sensor circuit terminal 19 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector If greater than the specified range, test the 12 V reference circuit for an open or high resistance.
8. Test for less than 2 ohms between the appropriate signal circuit terminals listed below. Left front sensor circuit terminal 34 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector Right front sensor circuit terminal 6 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector Left rear sensor circuit terminal 20 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector Right rear sensor circuit terminal 31 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector If greater than the specified range, test the signal circuit for an open or high resistance.
9. If all circuits test normal, replace the appropriate wheel speed sensor. If the DTC resets replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Front Wheel Speed Sensor Replacement»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system__front-wheel-speed-sensor-replacement)
2. «Rear Wheel Speed Sensor Replacement»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system__rear-wheel-speed-sensor-replacement)
3. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The pump motor is an integral part of the brake pressure modulator valve, while the pump motor relay is integral to the electronic brake control module (EBCM). The pump motor relay is not engaged during normal system operation. When the antilock brake system (ABS) or traction control system (TCS) operation is required the EBCM activates the pump motor relay and turns the pump motor ON.

1. Ignition is ON.
2. Initialization is complete.

1. The EBCM detects a short to ground or an open/high resistance on the B+ circuit.
2. The EBCM detects an open/high resistance on the ground circuit.
3. The EBCM detects the pump motor runs continuously.
4. The EBCM detects the pump motor is binding or stalled.

Action Taken When the DTC Sets

1. The EBCM disables the ABS/ traction control system (TCS)/ vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. The ABS indicator illuminates.
3. The Red brake indicator illuminates.
4. The Stability Control indicator illuminates.
5. The driver information center displays All Wheel Drive OFF, Service StabiliTrak and Service Traction Control messages.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit Verification

Ignition ON, perform the Pump Motor Test with a scan tool and listen/feel the Pump Motor turn ON and OFF.

1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the ground circuits listed below and ground: Terminal 13 Terminal 38 If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp illuminates between the B+ circuits listed below and ground. Terminal 1 Terminal 25 If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, replace the brake pressure modulator valve assembly.
4. If all circuits test normal, replace the brake pressure modulator valve assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Brake Pressure Modulator Valve Replacement»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system)
2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) uses input from the brake pressure sensor for vehicle stability enhancement system (VSES) functions. The brake pressure sensor is internal to the brake pressure modulator valve .

1. Ignition ON.
2. Ignition voltage is greater than 10 volts.

C0131 00

1. Sensor supply voltage is less than 4.5 volts or greater than 5.3 volts for more than 1 second.
2. Sensor signal voltage is less than 0.12 volts or greater than 3.2 volts for more than 1 second.

C0131 3A

EBCM has been replaced and the calibration to the brake pressure sensor is outside of programed range.

C0131 4B

The brake pressure sensor is not calibrated.

C0131 5A

1. The EBCM detects the brake pressure does not increase when braking, when it received a message that the brake pedal is applied.
2. The EBCM detects the brake pressure is increasing when braking, and did not receive a message that the brake pedal is applied.
3. Internal pressure sensor fault.

1. The EBCM disables the ABS/traction control system (TCS)/vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning indicator may be displayed.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

A C0131 can get set if the ECU is loosely attached to the hydraulic unit. The mountings should be checked for the proper torque.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

C0131 3A or C0131 4B

Verify DTC C0131 3A or CO131 4B is not set.

1. If DTC is set, perform the scan tool EBCM special function, Brake Pressure Sensor Calibration. Refer to «Brake Pressure Modulator Valve Pressure Sensor Calibration»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system__brake-pressure-modulator-valve-pressure-sensor) .

C0131 00 or C0131 5A

1. Apply and release brake pedal. Verify brake lamps operate properly. If brake lamps do not operate properly, refer to «Symptoms - Lighting»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__symptoms-lighting) .
2. Replace the brake pressure modulator valve assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Brake Pressure Modulator Valve Replacement»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system)
2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) monitors the brake pressure sensor voltage, vehicle speed, and a serial data message from the body control module (BCM) that the brake pedal is either Applied or Released. When the vehicle is stopping the EBCM detects the brake pressure sensor voltage increases and correlates the readings to the serial data message from the BCM that the brake pedal is applied, and the vehicle is slowing down, or when the vehicle is accelerating, the brake pedal is Released and brake pressure sensor voltage returns to 0 volts.

1. The ignition is ON.
2. The vehicle speed is greater than 11 km/h (7 mph).

1. The EBCM detects the vehicle speed is greater than 11 km/h (7 mph), the brake pedal is applied for one minute, and the brake pressure detects pressure less than the set value.
2. The EBCM detects the vehicle speed decreases, the brake pedal is released and the brake pressure sensor detects an increase in pressure.

1. A driver information center message and/or a warning indicator may be displayed.
2. The EBCM disables the antilock brake system, the traction control and the vehicle stability enhancement system for the duration of the ignition cycle.

1. The condition for setting the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, and/or Traction Control indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, and/or Traction Control are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, and/or Traction Control telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

1. DTC C0161 can set if the brake is applied while accelerating.
2. DTC C0161 will be set if the brake is applied for 60 seconds while at speeds greater than 10 km/h (6 mph), such as a two footed driving.

Schematic Reference

1. «Antilock Brake System Schematics»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system)
2. «Exterior Lights Schematics»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system)

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Note. If the ABS, and/or Traction Control indicators are ON with DTC C0161 set in history, perform the conditions for clearing the DTC and inform the customer that two footed driving set this DTC.

1. Ignition ON.
2. Verify the stop lamps turn ON and OFF while pressing and releasing the brake pedal. If the stop lamps do not turn ON and OFF Refer to «Symptoms - Lighting»(/buick/enclave/i-2007-2013/remont/exterior-lights/#lighting-system__symptoms-lighting) . If the stop lamps turn ON and OFF
3. Refer to Diagnostic Aids for this DTC.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The yaw rate, lateral acceleration, and longitudinal acceleration sensors are combined into one yaw/lateral/longitudinal accelerometer sensor, external to the electronic brake control module. The electronic brake control module supplies a 12 V reference to the accelerometer sensor. The accelerometer sensor communicates with the electronic brake control module via serial data. The module activates the stability control and the hill start assist function depending on the information received from the accelerometer sensor.

The vehicle speed is greater than 40 km/h (25 mph).

C0186 00

The lateral acceleration sensor signal offset is higher than 2.25 meters per second squared while driving straight ahead on a level surface with normal acceleration.

C0186 5A

1. The lateral acceleration sensor signal is not plausible with the yaw rate sensor signal.
2. The yaw and lateral accelerometer sensor reports an internal failure
3. Communication is lost between the electronic brake control module and the yaw and lateral accelerometer sensor.

C0196 00

When the vehicle is at standstill the yaw rate is zero. If the calculated offset value is outside the plausible range ± 5.25° per second at start of driving the fault is set.

C0196 5A

1. The yaw rate sensor signal is not plausible with the lateral acceleration sensor signal.
2. A correlation error between the yaw and lateral accelerometer sensor and steering angle sensor.
3. Communication is lost between the electronic brake control module and the yaw and lateral accelerometer sensor.

C0287 00 or C0287 5A

No longitudinal sensor signal

C0287 71

The electronic brake control module has received invalid serial data from the longitudinal accelerometer sensor.

C0287 4B

The longitudinal acceleration sensor is not calibrated.

One or more of the following actions may occur

1. The ABS indicator illuminates.
2. The Stabilitrak indicator illuminates.
3. A driver information center message and/or a warning indicator may be displayed.
4. The electronic brake control module disables the antilock brake system, the traction control system, the hill start assist and the vehicle stability enhancement system for the duration of the ignition cycle.

1. The condition for setting the DTC is no longer present and the ignition is cycled OFF then back to RUN.
2. The electronic brake control module clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the electronic brake control module. Do not replace the electronic brake control module for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power, and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The electronic brake control module should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the electronic brake control module should request all telltale indicators to turn OFF.

Possible causes of this DTC are as follows

1. Internal failure in the yaw and lateral accelerometer sensor.
2. The longitudinal accelerometer sensor is not calibrated.
3. Incorrectly mounted or loose yaw and lateral accelerometer sensor.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC U1826, C0292 or C0710 is not set. If the DTC is set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
2. Verify that DTC C0287 4B is not set. If the DTC is set, refer to «Vehicle Yaw Sensor Learn»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system__vehicle-yaw-sensor-learn) .
3. Inspect the yaw and lateral accelerometer sensor for correct installation. If loose or incorrect installation is diagnosed, correct the installation of the component.
4. Ignition OFF, disconnect the harness connector at the yaw and lateral accelerometer sensor.
5. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the ground circuit terminal 1 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
6. Ignition ON, test for B+ between the 12 V reference circuit terminal 4 and ground. If not within the specified range, test the 12 V reference circuit for a short to ground or open/high resistance.
7. If all circuits test normal, replace the yaw and lateral accelerometer sensor.

Perform the Diagnostic Repair Verification after completing the repair.

Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The EBCM controls it's internal valve relay to command the valve solenoids ON or OFF.

1. Ignition voltage is greater than 10 volts.
2. The solenoid relay is commanded ON.

1. The EBCM detects no change when commanding the valve relay ON or OFF.
2. The EBCM detects a stuck open solenoid valve relay or an open circuit between the solenoid valve relay and solenoid valves.

1. The EBCM disables the antilock brake system (ABS)/traction control system (TCS).
2. A DIC message and/or a warning indicator may be displayed.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, verify that DTC C0201 is not set.

1. If DTC is set, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) and the engine control module (ECM) simultaneously control the traction control. The EBCM sends a serial data message to the ECM requesting torque reduction. When certain ECM DTCs are set, the ECM will not be able to perform the torque reduction for traction control. A serial data message is sent to the EBCM indicating that traction control is not allowed.

Engine running.

The ECM detects a fault that prevents it from performing a traction control function and sends a serial data message to the EBCM indicating that torque reduction is not allowed.

The EBCM sends a serial data message to illuminate the appropriate warning/indicator message

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that no DTCs are set in the ECM.

1. If DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The wheel speed sensor receives ignition voltage from the electronic brake control module (EBCM) and provides an output signal back to the EBCM. As the wheel spins the sensor sends a DC square wave signal to the EBCM. The EBCM uses the frequency of this signal to calculate the wheel speed.

1. Ignition voltage is greater than 10 V.
2. No wheel speed sensor faults exist.
3. Brake is not applied.
4. Vehicle is not cornering.

Wheel speed differences between one wheel and the others is greater than 25 percent.

1. The EBCM disables the traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. A DIC message and/or a warning indicator may be displayed.

1. The condition for the DTC is no longer present.
2. The history DTC will clear after 40 consecutive fault-free drive cycles have occurred.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

1. Faulty wheel speed sensor will not set this DTC.
2. A vehicle using a space saver spare will not set this code.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, observe the scan tool Wheel Speed Sensor parameters while spinning the wheels. The readings should be analog to the wheel speeds.

1. Verify that all tires have the proper air pressure. If not the proper air pressure, adjust the air pressure for all tires to specification and verify the DTC does not reset. If the DTC resets, replace the EBCM.
2. Verify that all wheels and tires are the proper size. If incorrect wheel or tire size, replace the incorrect wheel or tire and verify the DTC does not reset. If the DTC resets, replace the EBCM.
3. If all components test normal, replace the EBCM.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) controls the vehicle stability enhancement system (VSES) by monitoring the inputs of the yaw rate/lateral accelerometer sensor, and steering wheel angle sensor. The readings are compared to an internal calibrated value so it knows if the vehicle is having an instability condition to activate the VSES. When the readings indicate a VSES event is occurring longer than 10 seconds is not possible under normal conditions. The yaw/lateral sensor is a combination sensor in one component.

1. The steering angle has been centered.
2. VSES is active.

One of the following conditions exist

1. VSES is engaged for 10 seconds with the yaw rate error always in either understeer or oversteer.
2. The yaw rate error is greater then 10 degrees/second for 5 seconds, and the yaw has not changed and the lateral acceleration is less than 0.5 g.

One or more of the following actions may occur

1. The EBCM disables the antilock brake system (ABS)/traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. The ABS indicator illuminates.
3. The Stabilitrak indicator illuminates.
4. The driver information center (DIC) displays All Wheel Drive Off/ Service Traction Control / Service Stabilitrak message.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

The following conditions can cause this concern

1. Improper steering alignment or tire pull
2. An improperly mounted or loose combination yaw rate/lateral accelerometer sensor
3. An internal yaw rate/lateral accelerometer failure

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that DTC C0186, C0196, C0253, or C0710 is not set.

1. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list)

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) receives serial data messages from the steering wheel position sensor identifying the position and direction of the steering wheel rotation.

Ignition ON.

The calculated steering angle from the steering wheel position sensor does not correlate with the steering angle calculated from the yaw rate.

One or more of the following actions may occur

1. The EBCM disables the antilock brake system (ABS)/traction control system (TCS) and vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. The ABS indicator illuminates.
3. The StabiliTrak indicator illuminates.
4. The driver information center displays All Wheel Drive Off/ Service Traction Control / Service StabiliTrak message.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that DTC C0186, C0196, C0252, or C0710 is not set. If any of the DTCs are set, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-trouble-code-dtc-list) .
2. With the scan tool perform the Steering Angle Sensor Centering. Refer to «Steering Angle Sensor Centering»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system__steering-angle-sensor-centering) .
3. Operate the vehicle within the conditions for setting, and verify the DTC does not reset. If the DTC sets, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) receives serial data messages from the body control module (BCM), engine control module (ECM), instrument panel cluster (IPC), and the transmission control module (TCM) which are needed to perform antilock brake system (ABS), vehicle stability enhancement system (VSES), or traction control system (TCS) functions.

Ignition voltage is greater than 10 volts.

The EBCM receives an invalid serial data message from another module.

1. The EBCM disables the traction control system (TCS)/ vehicle stability enhancement system (VSES).
2. A DIC message and/or a warning indicator may be displayed.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

This DTC indicates that there are no problems in the EBCM. The BCM, ECM, IPC and the TCM should be checked for a possible fault.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. With a scan tool, view the Invalid Signal Data Display.
2. If no invalid signal are present, view Signal Fault Data in the Enhanced DTC Data.
3. Refer to appropriate module for diagnosing the invalid message data.
4. Do not replace the EBCM due to this DTC fault.

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake module (EBCM) receives a serial data message from each of the network modules. Each module contains its own unique identification (ID) code that must be programmed into a new the EBCM.

Ignition ON.

The EBCM has not undergone the programming procedure.

1. The EBCM disables the ABS/ traction control system (TCS)/ vehicle stability enhancement system (VSES) for the duration of the ignition cycle.
2. The ABS indicator illuminates.
3. The Red brake indicator illuminates.
4. The Stability Control indicator illuminates.
5. The driver information center (DIC) displays All Wheel Drive OFF, Service Stabilitrak and Service Traction Control messages.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

A newly replaced EBCM will set DTC C0569 on its initial ignition ON cycle.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that C0569 is not set.

1. If the DTC is set, program the EBCM. If the DTC resets, replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) supplies ignition voltage to the steering angle sensor and the yaw/lateral accelerometer sensor. The EBCM receives serial data messages from both the steering angle sensor and the yaw/lateral accelerometer sensor. The steering wheel speed position sensor is an input to the EBCM and provides the position of the steering wheel.

The steering wheel speed position sensor measures the steering wheel degree of rotation. The EBCM utilizes this signal to calculate the driver intended driving direction. The electronic brake control module (EBCM) receives CAN message inputs from the steering wheel speed position sensor identifying the position and direction of the steering wheel rotation.

The engine is running.

C0710 00

1. Open or short to ground on the ignition voltage circuit
2. Open or short to voltage on the low reference circuit

C0710 5A

1. The calculated steering angle does not correlate between the steering angle sensor and the yaw rate sensor.
2. The steering wheel is off-center.

1. A driver information center message and/or a warning indicator may be displayed.
2. The EBCM disables the ABS, the traction control and the stability control for the duration of the ignition cycle.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction control and/or Stability control indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction control and/or Stability control indicators are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power, and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stability indicators are still illuminated, operate the vehicle at speeds greater than 16 km/h (10 MPH) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the indicators remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 MPH), the EBCM should request all the indicators to turn OFF.

1. Verify the steering wheel is properly installed.
2. Verify the steering wheel speed position sensor is installed correctly.
3. The car should not pull in either direction causing the steering wheel to be off-center while driving straight on a level surface.
4. Inspect the steering column wiring harness for chafing, when the steering wheel telescoping feature is adjusted all the way in and the tilt is cycled up or down. The wires in the steering column harness may be chafed or cut on the tilt telescope mechanism edges.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify that DTC U2142 is not set. If DTC U2142 is set Refer «DTC U2105-U2199»(/buick/enclave/i-2007-2013/remont/communication-devices/#data-communications-system) . If DTC U2142 is not set
3. Verify that DTC C0710 is not set. If DTC C0710 is set Refer to Circuit/System Testing. If DTC C0710 is not set
4. Refer to Diagnostic Aids for this DTC.

1. Ignition OFF and all vehicle systems OFF. Disconnect the harness connectors at the steering wheel speed position sensor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the low reference circuit terminal 6 and ground. If 10 ohms or greater Repair the open/high resistance in the circuit between the X201 inline connector and the steering wheel speed position sensor. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the ignition circuit terminal 5 and ground. If the test lamp does not illuminate Repair the open/high resistance in the circuit between the X201 inline connector and the steering wheel speed position sensor. If the test lamp illuminates
5. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down.
6. Test for less than 70 ohms between the serial data circuits terminal 2 and 3. If 70 ohms or greater Repair the open/high resistance in the circuits between the X201 inline connector and the steering wheel speed position sensor. If less than 70 ohms
7. Replace the steering wheel speed position sensor.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Steering Angle Sensor Replacement»(/buick/enclave/i-2007-2013/remont/steering-column-switches/#steering-wheel-and-steering-column)
2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Circuit Description

The electronic brake control module (EBCM) receives a serial data message from the tire pressure monitor (TPM) system when low tire pressure is detected. The EBCM will adjust the responses of vehicle stability enhancement system (VSES) to have optimal vehicle control when active.

The EBCM received a serial data message that low tire pressure is detected.

VSES is active.

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, Traction Control and/or Stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off retained accessory power (RAP), and wait 60 seconds.
2. Ignition ON, if the ABS, Traction Control and/or Stabilitrak telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should request all telltale indicators to turn OFF.
3. If the telltales remain ON with no DTCs set after the drive cycle, disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 40 km/h (25 mph), the EBCM should request all telltale indicators to turn OFF.

1. This DTC is only current for the duration of the VSES event, and then it will go to history.
2. This DTC is not an indication of an ABS/VSES malfunction.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Verify that the TPM system is functioning properly. Refer to Symptoms - Tire Pressure Monitoring .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the ABS. Refer to «Checking Aftermarket Accessories»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components, for obvious damage or conditions, which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer Testing for Intermittent Conditions and Poor Connections .

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «ABS Indicator Malfunction»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system)
2. «StabiliTrak Indicator Malfunction»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system)

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The instrument panel cluster (IPC) momentarily illuminates the antilock brake system (ABS) indicator during the bulb check when the ignition is cycled ON. When the electronic brake control module (EBCM) detects a fault requiring ABS indicator ON, it sends a serial data message to the IPC to illuminate the ABS indicator.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. With a scan tool command the IPC display test ON and OFF. The ABS indicator should turn ON and OFF. If the ABS indicator does not turn ON and OFF when commanded, replace the IPC.
2. Replace the EBCM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM or IPC replacement, setup, and programming

1. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The instrument panel cluster (IPC) illuminates the Stabilitrak indicator during the IPC bulb check or when the electronic brake control module (EBCM) detects a fault and sends a serial data message to the IPC commanding the indicator ON.

Conditions for Clearing

1. The condition for the DTC is no longer present.
2. The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Note. During normal diagnostic and/or repair verification technicians may find that the ABS, Traction Control and/or Stabilitrak indicators may be ON with NO DTCs displayed by the EBCM. Do not replace the EBCM for this condition.

If the ABS, traction control and/or stabilitrak telltales are ON with no DTCs set, perform the following steps

1. Remove the key from the ignition, open and close the driver's door to turn off Retained Accessory Power (RAP), and wait 60 seconds.
2. Ignition ON, if the EBCM telltales are still illuminated, operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test. The EBCM should turn OFF all telltale indicators.
3. If the telltales remain ON with no DTCs set after the drive cycle; disconnect the battery for at least 60 seconds then reconnect the battery.
4. Operate the vehicle at speeds greater than 15 km/h (10 mph), the EBCM should turn OFF all telltale indicators.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, with a scan tool command the IPC display test ON and OFF. The Stabilitrak indicator should turn ON and OFF. If the indicator does not turn ON and OFF, replace the IPC.
2. Observe the scan tool BCM Traction Control Switch parameter while pressing and releasing the traction control switch. The reading should change between Active and Inactive.

1. Ignition OFF, disconnect the harness connector at the traction control switch.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohms between the ground circuit terminal 3 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Traction Control Switch parameter is Inactive. If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the BCM.
4. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the ground circuit terminal 3. Verify the scan tool Traction Control Switch parameter is Active. If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
5. If all circuits test normal, test or replace the traction control switch.

Component Testing

1. Ignition OFF, disconnect the harness connector at the traction control switch.
2. Test for infinite resistance between the signal terminal 1 and the ground terminal 3 with the switch in the open position. If not the specified value, replace the traction control switch.
3. Test for less than 5 ohms between the signal terminal 1 and the ground terminal 3 with the switch in the closed position. If greater than the specified range, replace the traction control switch.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Electronic Traction Control Switch Replacement»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system)
2. «Control Module References»(/buick/enclave/i-2007-2013/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or IPC replacement, programming and setup

Note. The base hydraulic brake system must be bled before performing this automated bleeding procedure. If you have not yet performed the base hydraulic brake system bleeding procedure, refer to Hydraulic Brake System Bleeding (Manual) , Hydraulic Brake System Bleeding (Pressure) before proceeding.

1. Install a scan tool to the vehicle.
2. Start the engine and allow the engine to idle.
3. Using the scan tool, begin the automated bleed procedure.
4. Follow the instructions on the scan tool to complete the automated bleed procedure. Apply the brake pedal when instructed by the scan tool.
5. Turn the ignition OFF.
6. Remove the scan tool from the vehicle.
7. Fill the brake master cylinder reservoir to the maximum-fill level with GM approved brake fluid from a clean, sealed brake fluid container. Refer to «Master Cylinder Reservoir Filling»(/buick/enclave/i-2007-2013/remont/mechanical-hydraulic/#hydraulic-brake-system__master-cylinder-reservoir-filling) .
8. Bleed the hydraulic brake system. Refer to «Hydraulic Brake System Bleeding (Manual)»(/buick/enclave/i-2007-2013/remont/mechanical-hydraulic/#hydraulic-brake-system) , «Hydraulic Brake System Bleeding (Pressure)»(/buick/enclave/i-2007-2013/remont/mechanical-hydraulic/#hydraulic-brake-system) .
9. With the ignition OFF, apply the brakes 3-5 times, or until the brake pedal becomes firm, in order to deplete the brake booster power reserve.
10. Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
11. If the brake pedal feels spongy, repeat the automated bleeding procedure. If the brake pedal still feels spongy after repeating the automated bleeding procedure inspect the brake system for external leaks. Refer to «Brake System External Leak Inspection»(/buick/enclave/i-2007-2013/remont/mechanical-hydraulic/#hydraulic-brake-system__brake-system-external-leak-inspection) .
12. Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.
13. If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired. Refer to «Symptoms - Hydraulic Brakes»(/buick/enclave/i-2007-2013/remont/mechanical-hydraulic/#hydraulic-brake-system__symptoms-hydraulic-brakes) .
14. Drive the vehicle to exceed 13 km/h (8 mph) to allow ABS initialization to occur. Observe brake pedal feel.
15. If the brake pedal feels spongy, repeat the automated bleeding procedure until a firm brake pedal is obtained.

Steering Angle Sensor Centering

The steering angle sensor does not require centering often. Centering of the steering angle sensor might be required after certain service procedures are performed. Some of these procedures are as follows

1. Any change to the front wheel alignment
2. Collision or other physical damage
3. Electronic brake control module (EBCM) replacement
4. Intermediate shaft replacement
5. Steering angle sensor replacement
6. Steering column replacement
7. Steering gear replacement
8. Outer tie rod replacement

The EBCM, Steering Position Sensor Calibration procedure can be completed with a scan tool using the steps below.

1. Using the steering wheel, align the front wheels in the center forward position.
2. Apply the parking brake, or set the transmission in the PARK position.
3. Turn the ignition switch ON, with the engine OFF.
4. Clear any DTCs that may be set.
5. Using a scan tool, perform the EBCM, Special Functions, Steering Pos. Sensor Calibration.
6. Follow the scan tool directions to complete the calibration procedure.
7. After procedure is complete, press Exit and cycle the ignition OFF, open the driver door to cancel the Retained Accessory Power and wait one minute.
8. Cycle the ignition ON and clear all DTCs.

Scheme 4

Electronic Brake Control Module Replacement

Removal Procedure

1. Turn the ignition switch to the OFF position.
2. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
3. Disconnect the electronic brake control module (EBCM) electrical connector (1) by lifting the locking tabs.
4. Disconnect the master cylinder inlet brake pipe fittings (1). Cap the brake pipe fittings and plug the brake pressure modulator valve (BPMV) inlet ports to prevent brake fluid loss and contamination.
5. Disconnect the BPMV outlet port front brake pipe fittings (1). Cap the brake pipe fittings and plug the BPMV outlet ports to prevent brake fluid loss and contamination.
6. Disconnect the BPMV outlet port rear brake pipe fittings (1). Cap the brake pipe fittings and plug the BPMV outlet ports to prevent brake fluid loss and contamination.
7. Remove the 2 BPMV bracket nuts (1).
8. Remove the BPMV from the vehicle.
9. Remove the 2 BPMV insulator nuts and washers.
10. Carefully remove the BPMV from the bracket by pulling upward.
11. Remove the 2 BPMV insulators. Inspect the insulators for damage and replace, if necessary.
12. Remove the lower BPMV insulator. Inspect the insulator for damage and replace, if necessary.

Installation Procedure

1. Install the 2 BPMV insulators to the BPMV. Denatured alcohol may be used as an assembly aid to install the insulators.
2. Install the lower BPMV insulator to the bracket. Denatured alcohol may be used as an assembly aid to install the insulator.
3. Carefully install the BPMV to the bracket. Denatured alcohol may be used as an assembly aid on the insulators to install the BPMV.
4. Install the 2 BPMV insulator washers and the 2 nuts. Tighten Tighten the nuts to 8 N.m (71 lb in).
5. Install the BPMV and bracket assembly to the frame rail.
6. Install the 2 BPMV bracket nuts (1). Tighten Tighten the nuts to 20 N.m (15 lb ft).
7. Connect the BPMV outlet port rear brake pipe fittings (1). Tighten Tighten the fittings to 17 N.m (13 lb ft).
8. Connect the BPMV outlet port front brake pipe fittings (1). Tighten Tighten the fittings to 17 N.m (13 lb ft).
9. Connect the master cylinder inlet brake pipe fittings (1). Tighten Tighten the fittings to 25 N.m (18 lb ft).
10. Connect the EBCM electrical connector (1).
11. A new BPMV comes with both the primary and secondary circuits pre-filled with brake fluid. As long as the ignition key has not been cycled, only a base brake bleed is necessary. Bleed the hydraulic brake system. Refer to «Hydraulic Brake System Bleeding (Manual)»(/buick/enclave/i-2007-2013/remont/mechanical-hydraulic/#hydraulic-brake-system) , «Hydraulic Brake System Bleeding (Pressure)»(/buick/enclave/i-2007-2013/remont/mechanical-hydraulic/#hydraulic-brake-system) .
12. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) .
13. Observe the brake pedal feel after performing the diagnostic system check. If the pedal now feels spongy, air may have been in, or may have been introduced into the primary circuit. If the pedal feels spongy, perform the «Antilock Brake System Automated Bleed»(/buick/enclave/i-2007-2013/remont/anti-locktraction-control/#antilock-brake-system) .
14. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .

Brake Pressure Modulator Valve Pressure Sensor Calibration

The brake pressure sensor does not require calibration often. Calibration of the brake pressure sensor might be required after certain service procedures are performed. Some of these procedures are as follows

1. Electronic brake control module (EBCM) replacement
2. Brake pressure modulator valve assembly replacement

The Brake Pressure Sensor Calibration procedure can be completed with a scan tool using the following steps

1. Apply the parking brake, or set the transmission in the P position.
2. Release the brake pedal.
3. Install the scan tool to the data link connector.
4. Ignition ON, engine OFF
5. Select Chassis
6. Select EBCM (Electronic Brake Control Module)
7. Select Programming
8. Select Brake Pressure Sensor Calibration and follow the scan tool directions to complete the calibration procedure.
9. Calibrate Brake Pressure Sensor? Press the Yes, soft key.
10. Programming successful! Press the Confirm, soft key.
11. Clear any DTCs that may be set.

1. Remove the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
2. Release the front and rear brake pipes (1) from the routing clip on the frame rail.
3. Remove the 2 brake pressure modulator valve (BPMV) bracket nuts (2).
4. Remove the 2 BPMV nuts and washers.
5. Carefully lift the BPMV assembly upward to release the BPMV from the bracket.
6. Remove the BPMV bracket.
7. Remove the 2 upper BPMV bracket insulators. Inspect the bracket insulators for damage and replace, if necessary.
8. Remove the lower BPMV bracket insulator. Inspect the bracket insulator for damage and replace, if necessary.

1. Install the lower BPMV bracket insulator. Use denatured alcohol on the BPMV bracket insulator as an installation aid, if necessary.
2. Install the 2 upper BPMV bracket insulators. Use denatured alcohol on the BPMV bracket insulators as an installation aid, if necessary.
3. Install the BPMV bracket to the BPMV.
4. Install the 2 BPMV washers and nuts. Tighten Tighten the nuts to 8 N.m (71 lb in).
5. Install the 2 BPMV bracket nuts (2). Tighten Tighten the nuts to 20 N.m (15 lb ft).
6. Install the front and rear brake pipes (1) to the routing clip on the frame rail.
7. Install the air cleaner assembly. Refer to «Air Cleaner Assembly Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .

Front Wheel Speed Sensor Replacement

Note. If replacing the wheel speed sensor due to a DTC, inspect the back of the wheel bearing on the encoder surface for metallic chips or metal shavings. If metallic debris is found, clean the encoder surface to prevent interference with the wheel speed sensor signal and setting of a DTC. Refer to Diagnostic System Check - Vehicle to verify and clear the DTC.

1. If replacing the left front wheel speed sensor, remove the air cleaner element. Refer to «Air Cleaner Element Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
2. If replacing the right front wheel speed sensor, disconnect and position aside the battery positive junction block cables. Refer to «Battery Positive Junction Block Cable Replacement»(/buick/enclave/i-2007-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
3. Disconnect the wheel speed sensor electrical connector (1).
4. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
5. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/enclave/i-2007-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
6. Release the wheel speed sensor wire grommet (1) from the wheelhouse.
7. Carefully pull the wheel speed sensor wire and connector (2) through the wheel house.
8. Release the wheel speed sensor wire harness routing clip (3) from the wheel house.
9. Release the wheel speed sensor wire harness routing clips (4) and (5) from the suspension strut.
10. Remove the wheel speed sensor bolt.
11. Pull the wheel speed sensor straight up and out of the steering knuckle.

1. Install the wheel speed sensor to the steering knuckle.
2. Install the wheel speed sensor bolt. Tighten Tighten the bolt to 9 N.m (80 lb in).
3. Install the wheel speed sensor wire harness routing clips (4) and (5) to the suspension strut.
4. Insert the wheel speed sensor wire electrical connector (2) through the wheel house hole.
5. Seat the wheel speed sensor wire harness grommet (1) to the wheel house.
6. Connect the wheel speed sensor electrical connector (1).
7. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/enclave/i-2007-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
8. If replacing the right front wheel speed sensor, connect the battery positive junction block cables. Refer to «Battery Positive Junction Block Cable Replacement»(/buick/enclave/i-2007-2013/remont/charging-system/#battery-charging-system-and-starting-system) .
9. If replacing the left front wheel speed sensor, install the air cleaner element. Refer to «Air Cleaner Element Replacement»(/buick/enclave/i-2007-2013/remont/testing-diagnostics/#engine-controlsfuel-36l-repair-instructions) .
10. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) .

Rear Wheel Speed Sensor Replacement

Note. If replacing the wheel speed sensor due to a DTC, inspect the back of the wheel bearing on the encoder surface for metallic chips or metal shavings. If metallic debris is found, clean the encoder surface to prevent interference with the wheel speed sensor signal and setting of a DTC. Refer to Diagnostic System Check - Vehicle to verify and clear the DTC.

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/buick/enclave/i-2007-2013/remont/ignition-switchsteering-lock/#general-information__lifting-and-jacking-the-vehicle) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/enclave/i-2007-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
3. Disconnect the wheel speed sensor electrical connector (1).
4. Release the wheel speed sensor wire harness grommet (2) from the lower control arm bracket.
5. Release the wheel speed sensor wire harness routing clips (3) from the upper suspension link.
6. Remove the wheel speed sensor bolt.
7. Pull the wheel speed sensor straight up and out of the wheel knuckle.

1. Install the wheel speed sensor to the wheel knuckle.
2. Install the wheel speed sensor bolt. Tighten Tighten the bolt to 9 N.m (80 lb in).
3. Install the wheel speed sensor wire harness routing clips to the upper suspension link.
4. Install the wheel speed sensor wire harness routing clips (3) to the upper suspension link.
5. Install the wheel speed sensor wire harness grommet (2) to the lower control arm bracket.
6. Connect the wheel speed sensor electrical connector (1).
7. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/buick/enclave/i-2007-2013/remont/wheel-tire-system/#tires-and-wheels__tire-and-wheel-removal-and-installation) .
8. Perform the «Diagnostic System Check - Vehicle»(/buick/enclave/i-2007-2013/remont/oem-general-information/#vehicle-diagnostic-information) .

Scheme 5

Electronic Traction Control Switch Replacement

Vehicle Yaw Sensor Learn

The yaw and lateral accelerometer sensor does not require calibration often. Calibration of the accelerometer sensor might be required after certain service procedures are performed. Some of these procedures are as follows

1. Electronic brake control module (EBCM) replacement
2. Yaw and lateral accelerometer sensor replacement

The Yaw Rate Sensor Learn procedure can be completed with a scan tool using the following steps

1. Place vehicle on a level surface
2. Apply the parking brake, or set the transmission in the P position.
3. Ignition ON, engine OFF
4. Install the scan tool to the data link connector.
5. Scroll to the EBCM, special functions menu on the scan tool.
6. Select Yaw Rate Sensor Recalibration.
7. Press the Reset.
8. Clear any DTCs that may be set.

Scheme 6

Vehicle Yaw Sensor with Vehicle Lateral Accelerometer Replacement

ABS Description and Operation

This vehicle is equipped with a Bosch ABS/EBD/TCS/VSES brake system. The electronic brake control module (EBCM) and the brake pressure modulator valve is serviced separately. The brake pressure modulator valve uses a 4 circuit configuration to control hydraulic pressure to each wheel independently.

The following vehicle performance enhancement systems are provided.

1. Antilock Brake System (ABS)
2. Electronic Brake Distribution (EBD)
3. Hill Start Assist
4. Power Brake Booster Solenoid Vacuum Supply
5. Traction Control System (TCS)
6. Vehicle Stability Enhancement System (VSES)

Scheme 7

The following components are involved in the operation of the above systems.

1. ABS pump motor-The ABS pump motor is part of the brake pressure modulator valve. The ABS pump motor is active during ABS, VSES and base brake power assist functions. System relays-There are two system relays internal to the EBCM. The solenoid relay is energized when the ignition is ON. The ABS pump motor relay supplies a ground path to the ABS pump motor when the EBCM commands the ABS pump motor on. The system relays are non serviceable. Solenoids-The solenoids are commanded ON and OFF by the EBCM to operate the appropriate valves in the brake pressure modulator valve (BPMV).
2. Brake booster vacuum sensor-The Brake Booster Vacuum Sensor is a input to EBCM, and operates the ABS pump motor to precharge the brake system.
3. Brake pressure modulator valve (BPMV)-The BPMV uses a 4-circuit configuration to control hydraulic pressure to each wheel independently. The BPMV contains the following components: ABS pump motor and pump Four inlet valves Four outlet valves Two TC isolation valves Two TC supply valves A master cylinder pressure sensor A front low-pressure accumulator A rear low-pressure accumulator
4. Master cylinder pressure sensor-The master cylinder pressure sensor is located within the BPMV. The master cylinder pressure sensor uses a 5-volt reference and generates an output signal proportionate to the hydraulic fluid pressure which is present in the front brake circuit at the master cylinder.
5. Steering wheel position sensor-The EBCM receives several inputs from the steering wheel position sensor. Three digital square wave signal inputs and one analog signal input are wired directly to the EBCM harness connector. The EBCM uses the signals A and B for determining position movement and uses the analog and index signals to determine absolute center. All signals are monitored for plausibility to each other. The sensor is provided ground and 5-volt power directly from the EBCM.
6. Traction control switch-VSES and the engine torque reduction function of TCS are manually disabled or enabled by pressing the traction control switch.
7. Wheel speed sensors (WSS)-EBCM sends a 12-volt reference voltage signal to each wheel speed sensor. As the wheel spins, the wheel speed sensor produces a square wave DC signal voltage. The wheel speed sensor increases the signal frequency as the wheel speed increases, but does not increase the signal amplitude.
8. Yaw/lateral accelerometer sensor--The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one yaw/lateral accelerometer sensor, external to the EBCM. The EBCM receives serial data message inputs from the yaw rate, lateral acceleration and longitudinal acceleration sensor and activates stability control and hill start assist function depending on multi-axis acceleration sensor input

When wheel slip is detected during a brake application, an ABS event occurs. During antilock braking, hydraulic pressure in the individual wheel circuits is controlled to prevent any wheel from slipping. A separate hydraulic line and specific solenoid valves are provided for each wheel. The ABS can decrease, hold, or increase hydraulic pressure to each wheel. The ABS does not, however, increase hydraulic pressure above the amount which is transmitted by the master cylinder during braking.

During antilock braking, a series of rapid pulsations is felt in the brake pedal. These pulsations are caused by the rapid changes in position of the individual solenoid valves as the electronic brake control module (EBCM) responds to wheel speed sensor inputs and attempts to prevent wheel slip. These pedal pulsations are present only during antilock braking and stop when normal braking is resumed or when the vehicle comes to a stop. A ticking or popping noise may also be heard as the solenoid valves cycle rapidly. During antilock braking on dry pavement, intermittent chirping noises may be heard as the tires approach slipping. These noises and pedal pulsations are considered normal during antilock operation.

Vehicles equipped with ABS may be stopped by applying normal force to the brake pedal. Brake pedal operation during normal braking is no different than that of previous non-ABS systems. Maintaining a constant force on the brake pedal provides the shortest stopping distance while maintaining vehicle stability. The typical ABS activation sequence is as follows.

Pressure Hold

The EBCM closes the isolation valve and keeps the dump valve closed in order to isolate the slipping wheel when wheel slip occurs. This holds the pressure steady on the brake so that the hydraulic pressure does not increase or decrease.

Pressure Decrease

If a pressure hold does not correct the wheel slip condition, a pressure decrease occurs. The EBCM decreases the pressure to individual wheels during deceleration when wheel slip occurs. The isolation valve is closed and the dump valve is opened. The excess fluid is stored in the accumulator until the pump can return the fluid to the master cylinder or fluid reservoir.

Pressure Increase

After the wheel slip is corrected, a pressure increase occurs. The EBCM increases the pressure to individual wheels during deceleration in order to reduce the speed of the wheel. The isolation valve is opened and the dump valve is closed. The increased pressure is delivered from the master cylinder.

Electronic Brake Distribution (EBD)

The electronic brake distribution (EBD) is a control system that enhances the hydraulic proportioning function of the mechanical proportioning valve in the base brake system. The EBD control system is part of the operation software in the electronic brake control module (EBCM). The EBD uses active control with existing ABS in order to regulate the vehicle's rear brake pressure.

Brake Pressure Application

The EBCM uses brake pressure application to control traction by transferring torque through the driveline to wheels which are not slipping. The ABS pump motor, and appropriate valve solenoids are commanded ON and OFF to apply brake pressure to the slipping wheels. Brake pressure application is used in an attempt to maintain equal wheel speed sensor (WSS) signals at the driven wheels.

The EBCM does not allow excessive brake pressure application due to the fact that the solenoid coils or the brakes may become overheated, damaging the EBCM or reducing the drivers ability to stop the vehicle. Estimated coil and brake temperatures are determined by a calculation in the EBCM software. Overheated solenoid coils cause all brake pressure application to become disabled and the stability system disabled message to be displayed. Overheated brakes cause brake pressure application during TCS events to disable, yet the VSES remains functional and as long as the engine torque reduction is enabled, there is no indication to the driver when this occurs and no DTC sets.

Hill Start Assist

The hill start assist allows the driver to launch the vehicle without a roll back while the driver is moving there foot from the brake pedal to the accelerator pedal. The EBCM calculates the brake pressure, which is needed to hold the vehicle on an incline and locks that pressure for a certain time by commanding the appropriate solenoid valves ON and OFF when the brake pedal is released. Hill start assist is activated when the EBCM determines that the driver wishes to move the vehicle up-hill, either backwards or forwards.

The following inputs are used for hill start assist feature

1. Brake switch
2. Brake pressure
3. Longitudinal acceleration
4. Engine torque
5. Reverse gear information
6. Accelerator pedal position
7. Vehicle speed

Vehicle Stability Enhancement System (VSES)

Vehicle stability enhancement system (VSES) provides added stability during aggressive maneuvers. Yaw rate is the rate of rotation about the vehicle's vertical axis. The VSES is activated when the electronic brake control module (EBCM) determines that the desired yaw rate does not match the actual yaw rate as measured by the yaw rate sensor.

The desired yaw rate is calculated by the EBCM using, primarily, the following inputs.

1. The position of the steering wheel
2. The speed of the vehicle
3. The lateral, or sideways acceleration of the vehicle

The difference between the desired yaw rate and the actual yaw rate is the yaw rate error, which is a measurement of oversteer or understeer. When a yaw rate error is detected, the EBCM attempts to correct the vehicle's yaw motion by applying brake pressure to one or more of the wheels. The amount of brake pressure which is applied varies, depending on the correction required. The engine torque may be reduced also, if it is necessary to slow the vehicle while maintaining stability.

VSES activations generally occur in turns during aggressive driving. When braking during VSES activation, the pedal may pulsate. The brake pedal pulsates at a higher frequency during VSES activation than during ABS activation.

Power-Up Self-Test

The electronic brake control module (EBCM) is able to detect many malfunctions whenever the ignition is ON. However, certain failures cannot be detected unless active diagnostic tests are performed on the components. Shorted solenoid coil or motor windings, for example, cannot be detected until the components are commanded ON by the EBCM. Therefore, a power-up self-test is required at the beginning of each ignition cycle to verify correct operation of components before the various control systems can be enabled. The EBCM performs the first phase of the power-up self-test when the ignition is first turned ON. The system relay, solenoids and the ABS pump motor are commanded ON and OFF to verify proper operation and the EBCM verifies the ability to return the system to base braking in the event of a failure. The master cylinder pressure sensor performs a self-test by sending a series of specific voltage signals to the EBCM, each for a predetermined amount of time. This phase of the power-up self-test may be heard by the driver, depending on how soon the engine is cranked and started after turning ON the ignition. The second phase of the power-up self-test begins when the vehicle is driven at a speed greater than 12 km/h (7.5 mph) and the EBCM has not detected any traction control module (TCS)/vehicle stability enhancement system (VSES) related malfunctions thus far. When the brake switch indicates that the brake is not applied and the master cylinder pressure is detected as being low, the EBCM proceeds with the test. The EBCM isolates all of the wheels by closing the 4 isolation valves. Due to the fact that all of the wheels are isolated during the second phase of the test, the test must be aborted if the brake is applied while the test is being performed. Occasionally, the driver may detect this by experiencing a momentary hard pedal.

VSES Sensors Initialization

The vehicle stability enhancement system (VSES) sensors values may vary slightly due to differences in temperature, sensor mounting, connector resistances, manufacturing, etc. Since VSES is a very sensitive and precise control system, it is imperative that the electronic brake control module (EBCM) be able to accurately equate a given sensor voltage with an actual unit of measurement. For example, the yaw rate signal of one vehicle may be 2.64 volts at +18.0 deg/sec yaw rate while the yaw rate signal of another vehicle may be 2.64 volts at +17.5 deg/sec yaw rate. Therefore, at the beginning of each ignition cycle, the EBCM must perform an initialization procedure to observe how the VSES sensors are correlated with each other and also to determine what each sensor value is when the applicable unit of measurement equals 0. This voltage is referred to as the sensor bias voltage. Although some activation of the VSES system may occur if required to prior to full initialization, the system does not give optimum performance until the sensors are fully initialized.

The following VSES sensors require initialization

1. The yaw rate sensor
2. The lateral accelerometer sensor
3. The longitudinal acceleration sensor
4. The master cylinder pressure sensor
5. The steering wheel position sensor

When the vehicle speed is greater than 25 km/h (15 mph), full sensor initialization must occur during 3 km (1.8 mi) of driving or 1 km (0.6 mi) of straight and stable driving, whichever occurs first. Although an attempt at initialization may fail due to driving conditions, such as driving on a very winding road, failed initialization is usually caused by a sensor bias voltage which is not within an acceptable range. Often, a DTC sets soon after a failed initialization attempt. The message center displays the stability system disabled message when sensor initialization fails.

ECE 13 Response

The electronic brake control module (EBCM) illuminates the ABS indicator when a malfunction which disables ABS is detected. Usually, the ABS indicator is turned OFF during the following ignition cycle unless the fault is detected during that ignition cycle. However, the setting of a wheel speed sensor related DTC causes the ABS indicator to remain illuminated during the following ignition cycle until the vehicle is operated at a speed greater than 13 km/h (8 mph). This allows the EBCM to verify that no malfunction exists, before turning OFF the ABS indicator. This reaction occurs even if the ABS indicator turns OFF when the scan tool is used to clear the DTCs. When repairing these vehicles, it is important to ensure that the ECE 13 response has occurred and that the ABS indicator does not illuminate after returning the vehicle to the customer. It is also important to verify that ECE 13 is not the cause of an ABS indicator which is illuminated when no DTCs are set, before attempting to diagnose other possible causes.

Driver Information Indicators and Messages

The following indicators are used to inform the driver of several different factors.

Brake Warning Indicator

The instrument panel cluster (IPC) illuminates the brake warning indicator when the following occurs.

1. The body control module (BCM) detects that the park brake is engaged. The IPC receives a serial data message from the BCM requesting illumination. The brake warning indicator flashes at a rate of approximately twice per second when the park brake is engaged.
2. The electronic brake control module (EBCM) detects a low brake fluid condition or a base brake pressure differential and sends a serial data message to the IPC requesting illumination.
3. The IPC performs the bulb check.
4. The EBCM detects an ABS-disabling malfunction which also disables electronic brake distribution (EBD) and sends a serial data message to the IPC requesting illumination.

ABS Indicator

The IPC illuminates the ABS indicator when the following occurs.

1. The EBCM detects an ABS-disabling malfunction and sends a serial data message to the IPC requesting illumination.
2. The IPC performs the bulb check.
3. The IPC detects a loss of serial data communication with the EBCM.
4. A DTC is set during the previous ignition cycle which requires an ECE 13 response at the beginning of the current ignition cycle. The EBCM sends a serial data message to the IPC requesting illumination.

Traction Control Off Indicator

The IPC illuminates the traction off indicator when the following occurs.

1. The EBCM disables engine torque reduction due to a malfunction and sends a serial data message to the IPC requesting illumination.
2. The driver manually disables VSES and engine torque reduction by pressing the traction control switch. The EBCM sends a serial data message to the IPC requesting illumination.

Service Brake Booster Message

The service brake system message is displayed whenever the red brake warning indicator is illuminated.

Stabilitrak Off Message

The message center displays the stabilitrak off message when one or more of the following conditions exists.

1. The transfer case is shifted into 4 LO. The EBCM sends a serial data message to the IPC requesting illumination.
2. The driver manually disables the VSES and engine torque reduction by pressing the traction control switch. The EBCM sends a serial data message to the IPC requesting illumination.
3. The estimated temperature of any solenoid coil exceeds an acceptable limit. The EBCM sends a serial data message to the IPC requesting this display.
4. The EBCM detects a failed brake switch. The EBCM sends a serial data message to the IPC requesting this display. A DTC sets when this condition exists.
5. VSES sensor initialization time is excessive. The EBCM sends a serial data message to the IPC requesting this display.
6. Serial data communication between the EBCM and any of several other control modules is interrupted. The EBCM sends a serial data message to the IPC requesting this display or the IPC displays the message when communication with the EBCM is interrupted.
7. The powertrain control module is not able to perform engine torque reduction. The EBCM sends a GMLAN message to the IPC requesting this display. DTCs set when this condition exists.
8. The EBCM detects an excessively low or excessively high ignition voltage. The EBCM sends a GMLAN message to the IPC requesting this display.

Service Stabilitrak Message

The message center displays the service stability system message when any one of many VSES-disabling DTCs is set. The EBCM sends a serial data message to the IPC requesting this display.

Service Traction Control Message

The message center displays the service traction control system message when any one of many traction control - disabling DTCs is set. The EBCM sends a serial data message to the IPC requesting this display.

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Symptoms - Lighting
• Exterior Lights Schematics
• Diagnostic Trouble Code (DTC) List - Vehicle
• DTC U2105-U2199
• Steering Angle Sensor Replacement
• Symptoms - Tire Pressure Monitoring
• Checking Aftermarket Accessories
• Brake Fluid Irritant Warning
• Brake Fluid Effects on Paint and Electrical Components Caution
• Hydraulic Brake System Bleeding (Manual)
• Master Cylinder Reservoir Filling
• Brake System External Leak Inspection
• Symptoms - Hydraulic Brakes
• Air Cleaner Assembly Replacement
• Fastener Caution
• Brake Dust Warning
• Battery Positive Junction Block Cable Replacement
• Lifting and Jacking the Vehicle
• Tire and Wheel Removal and Installation
• Front Floor Console Accessory Housing Replacement (Acadia)
• SIR Warning
• SIR Disabling and Enabling
• DTC C0035-C0050
• ABS Description and Operation
• Front Wheel Speed Sensor Replacement
• Rear Wheel Speed Sensor Replacement
• Brake Pressure Modulator Valve Pressure Sensor Calibration
• Vehicle Yaw Sensor Learn
• Steering Angle Sensor Centering