Antilock Brake System with Traction Control System & Stability Control System Cadillac SRX II

Fastener Tightening Specifications

Scheme 1

Scheme 2

Scheme 3

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

The body control module (BCM) monitors the traction control switch. When the traction control switch is pressed once, the BCM will request the electronic brake control module (EBCM) via serial data to disable the traction control. When the traction control switch is pressed for 5 seconds, the BCM will request the EBCM to disable the stability control. The EBCM will request the instrument cluster via serial data to turn the traction control off and stability control off indicator ON to notify the driver of the deactivation.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The BCM detects a short to ground on the signal circuit.

Action Taken When the DTC Sets

The BCM ignores the traction control switch signal input.

Conditions for Clearing the DTC

A current DTC clears when the diagnostic runs and passes.

Reference Information

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#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 BCM Traction Control Switch parameter while pressing and releasing the traction control switch. The reading should change between Active and Inactive.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the S48E Multi-Function Switch - Center Console.
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 2 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool BCM Traction Control Switch parameter is Inactive. If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
4. Install a 3A fused jumper wire between the signal circuit terminal 7 and ground.
5. Verify the scan tool BCM, 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 K9 Body Control Module.
6. If all circuits test normal, test or replace the S48E Multi-Function Switch - Center Console.

Static Test

1. Ignition OFF, disconnect the harness connector at the S48E Multi-Function Switch - Center Console.
2. Test for infinite resistance between the signal circuit terminal 7 and the ground circuit terminal 2 with the switch in the released position. If less than the specified value, replace the S48E Multi-Function Switch - Center Console.
3. Test for less than 5 ohms between the signal circuit terminal 7 and the ground circuit terminal 2 with the switch in the pressed position. If greater than the specified value, replace the S48E Multi-Function Switch - Center Console.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Accessory Switch Replacement»(/cadillac/srx/ii-2009-2012/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The wheel speeds are detected by active wheel speed sensors and encoder rings. The encoder ring consists of permanent magnets. Each wheel speed sensor receives 12 V reference voltages from the electronic brake control module (EBCM). The wheel speed sensor produces changing current between 7-14 mA on the EBCM signal circuit. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the actual wheel speed.

C0035 06 - C0050 06

Ignition ON

C0035 0F - C0050 0F

1. Ignition ON
2. Vehicle speed is greater than 35 km/h (22 mph)

C0035 18 - C0050 18

1. Ignition ON
2. Vehicle speed is greater than 10 km/h (6 mph)

C0035 5A - C0050 5A

1. Ignition ON
2. Vehicle speed is greater than 20 km/h (13 mph)

A short to voltage, short to ground or open/high resistance on the wheel speed sensor 12 V reference or low reference circuit is detected for 0.14 second.

An erratic wheel speed sensor signal is detected for 0.17 second.

A missing wheel speed sensor signal is detected for 180 seconds.

Difference between fastest and slowest wheel speed is greater than 50% for 30 seconds.

1. The EBCM disables the ABS, traction control, and stability control for the duration of the ignition cycle.
2. The ABS indicator turns ON.
3. The traction control/stability control-active indicator turns ON.

1. A current DTC clears when the diagnostic runs and passes.
2. The EBCM will turn OFF the indicator in the next ignition cycle.

Diagnostic Aids

1. Do not use a magnet to clean the encoder ring.
2. If 2 or more wheel speed sensors are inoperative, diagnose each wheel speed sensor individually.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, driving in a straight line at a speed greater than 20 km/h (13 mph), observes the scan tool Wheel Speed Sensor parameters. The readings should be within 1 mph of each other.

1. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor.
2. Ignition ON, test for greater than 11 V between the signal circuit terminal B and ground. If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 EBCM.
3. Install a 3 A fused jumper wire at the signal circuit terminal B. Verify the scan tool Wheel Speed Sensor parameter changes while rapidly tapping the fused jumper wire to the low reference circuit terminal A. If no change is observed, disconnect the harness connector at the K17 EBCM and test for the following conditions below. If all circuits test normal, replace the K17 EBCM. Signal circuit for short to voltage. Low reference circuit for a short to voltage, short to ground, or an open/high resistance.
4. If all circuits test normal, test or replace the B5 wheel speed sensor.

Component Testing

Note. The following wheel speed sensor test is polarity sensitive. The wheel speed sensor can be permanently damaged if the polarity is reversed during the test.

1. Ignition OFF, disconnect the harness connector at the appropriate B5 wheel speed sensor.
2. Connect a 3 A fused jumper wire between the signal terminal 1 and 12 V.
3. Connect a DMM set to read DC amperage between the low reference terminal 2 and ground.
4. Spin the wheel very slowly, test for a DC current switching between a low value of 4-8 mA and a high value of 11-16 mA. If not within the specified range, replace the B5 wheel speed sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Front Wheel Speed Sensor Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
2. «Rear Wheel Speed Sensor Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
3. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, setup and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The pump motor is an integral part of the brake pressure modulator valve assembly, 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 ABS, traction control or stability control operation is required, the EBCM activates the pump motor relay and turns the pump motor ON.

Ignition ON.

C0110 00

1. An unintentional pump motor activation is detected for 1.785 s.
2. An open/high resistance is detected on the pump motor B+ circuit for 1.8 s.

C0110 04

An unintentional pump motor activation is detected for 1.785 s.

C0110 61

1. A short to ground or an open/high resistance is detected on the pump motor B+ circuit for 1.8 s.
2. A faulty pump motor is detected.

1. The EBCM disables the ABS, traction control and stability control for the duration of the ignition cycle.
2. The ABS indicator turns ON.
3. The traction control/stability control-active indicator turns ON.
4. The brake warning indicator turns ON.

1. A current DTC clears when the diagnostic runs and passes.
2. The EBCM will turn OFF the indicators in the next ignition cycle.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition OFF, disconnect the harness connector at the K17 Electronic Brake Control Module (EBCM).
2. Test for less than 1 ohms between the ground circuit terminal 16 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
3. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Ignition OFF, remove the K17 Electronic Brake Control Module (EBCM) from the Q5 brake pressure modulator valve assembly.
5. Inspect the K17 Electronic Brake Control Module (EBCM) to Q5 brake pressure modulator valve assembly connector for damage, corrosion, or presence of brake fluid. If connector corrosion or damage is diagnosed, replace the Q5 brake pressure modulator valve assembly and/or K17 Electronic Brake Control Module (EBCM) as necessary. If brake fluid is present, replace the Q5 brake pressure modulator valve assembly and the K17 Electronic Brake Control Module (EBCM).
6. Connect the K17 Electronic Brake Control Module (EBCM) harness connector with the Q5 brake pressure modulator valve assembly still separated.
7. Connect a test lamp between the pump motor circuits terminals.
8. Ignition ON, command the ABS Pump Motor Increase and Decrease with a scan tool, verify the test lamp illuminates when commanded. If test lamp does not illuminate, replace the K17 Electronic Brake Control Module (EBCM).
9. If all circuits test normal, replace the Q5 brake pressure modulator valve assembly and verify the DTC does not reset. If the DTC resets, replace the K17 Electronic Brake Control Module (EBCM).

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Brake Pressure Modulator Valve Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The brake pressure sensor is integral to the brake pressure modulator valve assembly. The electronic brake control module (EBCM) monitors the brake pressure sensor supply voltage and the signal voltage. The body control module (BCM) sends a serial data message when the brake pedal is applied.

Ignition ON.

C0131 00

The brake pressure sensor signal is out of the specified range.

C0131 5A

1. The EBCM detected an invalid or erratic brake pressure sensor signal.
2. The brake pressure sensor signal is not plausible.
3. The brake pressure sensor signal offset is out of specified range.

1. The EBCM disables the traction control and stability control for the duration of the ignition cycle.
2. The traction control/stability control-active indicator turns ON.

1. A current DTC clears when the diagnostic runs and passes.
2. The EBCM will turn OFF the indicator in the next ignition cycle.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#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 Brake Pressure Sensor parameter. The reading should be 0 V, when the brake pedal is released and greater than 1 V, when the brake pedal is applied.

1. Verify that DTC C0131 5A is not present. If DTC C0131 5A is present, perform the «Brake Pressure Modulator Valve Pressure Sensor Calibration»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system__brake-pressure-modulator-valve-pressure-sensor) .
2. Replace the Q5 brake pressure modulator valve assembly and verify the DTC does not reset. If the DTC resets replace the K17 Electronic Brake Control Module (EBCM).

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Brake Pressure Modulator Valve Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The body control module (BCM) monitors the brake pedal position sensor and sends a serial data message when the brake pedal is applied. When the vehicle is stopping, the electronic brake control module (EBCM) monitors for the brake pedal applied serial data message from the BCM, with the brake pressure increasing and the vehicle slowing down, or when the vehicle is accelerating, the brake pedal is not applied and brake pressure is not increasing.

Ignition ON.

1. The EBCM detects 4 accelerations from standstill to a vehicle speed greater 40 km/h (26 MPH) without any brake light switch signal changes.
2. The EBCM detects the vehicle speed is greater than 20 km/h (13 MPH), the brake pedal is applied for 360 s, and brake pressure is less than 15 bar (218 PSI).

A current DTC clears when the diagnostic runs and passes.

No actions were taken.

The DTC C0161 5A can be set if the brake pedal is applied while accelerating or the brake pedal position sensor is out of adjustment.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#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 stop lamps while applying and releasing the brake pedal. Verify the stop lamps operate properly.

1. If the stop lamps do not operate properly, refer to «Symptoms - Lighting»(/cadillac/srx/ii-2009-2012/remont/exterior-lights/#lighting-system__symptoms-lighting) .

1. Ignition OFF, inspect the B22 Brake Pedal Position Sensor for correct installation. If loose or incorrect installation is diagnosed, correct the installation of the component.
2. Ignition ON, perform the «Brake Pedal Position Sensor Calibration»(/cadillac/srx/ii-2009-2012/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-calibration) and verify the DTC does not reset. If the DTC resets, replace the K17 Electronic Brake Control Module (EBCM).

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Brake Pedal Position Sensor Replacement»(/cadillac/srx/ii-2009-2012/remont/exterior-lights/#lighting-system__brake-pedal-position-sensor-replacement)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for control module replacement, setup and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis acceleration sensor, external to the electronic brake control module (EBCM). The EBCM supplies a 12 V reference voltage to the multi-axis acceleration sensor. The multi-axis acceleration sensor communicates with the EBCM via the high speed controller area network (CAN) serial data circuit. The EBCM activates the stability control function depending on multi-axis acceleration sensor input.

Ignition ON

C0186 5A

1. The lateral acceleration sensor signal offset is out of specified range.
2. The lateral acceleration sensor signal is not plausible with the yaw rate sensor signal, steering angle sensor signal and vehicle speed.

C0186 71

The EBCM received an invalid lateral acceleration sensor signal.

C0196 00

The yaw rate sensor signal is not plausible.

C0196 5A

1. The yaw rate sensor offset is out of specified range.
2. The yaw rate sensor signal is not plausible with the lateral acceleration sensor signal, steering angle sensor signal and vehicle speed.

C019B 5A

The yaw rate sensor signal is out of specified range.

C0287 4B

The longitudinal acceleration sensor signal offset is out of specified range.

C0287 5A

The longitudinal acceleration sensor signal is not plausible with the vehicle speed.

C0287 71

The EBCM received an invalid longitudinal acceleration sensor signal.

C0186 5A, C0186 71, C0196 00, C0196 5A, and C019B 5A

1. The EBCM disables the stability control for the duration of the ignition cycle.
2. The traction control/stability control-active indicator turns ON.

C0287 4B, C0287 5A, and C0287 71

The EBCM disables the hill start assist for the duration of the ignition cycle.

1. A current DTC clears when the diagnostic runs and passes.
2. The EBCM will turn OFF the indicator in the next ignition cycle.

DTC C0186 and C0287 may set after replacing the Multi-Axis Acceleration Sensor if the sensor is not configured and setup. Perform the Multi-Axis Acceleration Sensor Module Programming and Setup and the Vehicle Yaw Sensor Learn procedures to complete the configuration and setup.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References

1. Ignition ON, verify that DTC C0800 is not present. If DTC C0800 is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Verify that DTC C0186 5A, C0196 00, C0196 5A, C019B 5A, C0287 4B, and C0287 5A is not present. If any listed DTC is present, perform the «Multi-Axis Acceleration Sensor Module Programming and Setup»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__multi-axis-acceleration-sensor-module-programming-and) and the «Vehicle Yaw Sensor Learn»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system__vehicle-yaw-sensor-learn) .
3. Inspect the B119 Multi-axis Acceleration Sensor for correct installation. If loose or incorrect installation is diagnosed, correct the installation of the component and perform the «Vehicle Yaw Sensor Learn»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system__vehicle-yaw-sensor-learn) .
4. Ignition OFF, disconnect the harness connector at the B119 Multi-axis Acceleration 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 6 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
6. Ignition ON, test for greater than 10 V between the 12 V reference circuit terminal 5 and ground. If less than the specified value, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
7. If all circuits test normal, replace the B119 Multi-axis Acceleration Sensor and verify the DTC does not reset. If the DTC resets, replace the K17 Electronic Brake Control Module (EBCM).

Perform the Diagnostic Repair Verification

1. «Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM or Multi-axis Acceleration Sensor replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The solenoid valves are integral parts of the brake pressure modulator valve assembly. The brake pressure modulator valve assembly contains an isolation solenoid valve and a dump solenoid valve for each wheel and a traction control/stability control supply solenoid valve and isolation solenoid valve for each brake circuit. The solenoid valves are not engaged during normal system operation. When the ABS, traction control or stability control operation is required the electronic brake control module (EBCM) turns the required solenoid valves ON.

Ignition ON

Stability control is active for more than 15 s.

1. The EBCM disables the stability control for the duration of the ignition cycle.
2. The traction control/stability control-active indicator turns ON.

The condition for setting the DTC is no longer present.

DTC can set because of extended operation of ABS, traction control or stability control.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, verify that DTC C0186, C0196, C019B, or C0710 is not set as a present DTC. If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) to diagnose that DTC prior to this diagnostic.
2. Ignition OFF, inspect the B99 Steering Wheel Angle Sensor and B119 Multi-axis Acceleration Sensor for correct installation. If loose or incorrect installation is diagnosed, correct the installation of the component.
3. Ignition ON, verify that DTC C0280 54 is not set as a present DTC. If DTC C0280 54 is present, replace the K17 Electronic Brake Control Module (EBCM) and verify DTC does not reset. If the DTC resets, replace the Q5 brake pressure modulator valve assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Brake Pressure Modulator Valve Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The steering angle sensor receives a 12 V reference voltage from the electronic brake control module (EBCM). The EBCM receives high speed controller area network (CAN) message inputs from the steering angle sensor identifying the position and direction of the steering wheel rotation. The EBCM utilizes this signal to calculate the driver intended driving direction.

Ignition ON.

C0460 71

The electronic suspension control module received an invalid steering angle sensor signal.

C0710 42

The steering angle sensor is not calibrated.

C0710 5A

1. The steering angle sensor signal is out of specified range.
2. The steering angle sensor signal is not plausible with the yaw rate sensor and lateral acceleration sensor signal.
3. The steering angle sensor offset is out of specified range.

C0710 71

The steering angle sensor signal is invalid.

1. The EBCM disables the stability control and hill start assist for the duration of the ignition cycle.
2. The traction control/stability control-active indicator turns ON.

1. A current DTC clears when the diagnostic runs and passes.
2. The EBCM will turn OFF the indicator in the next ignition cycle.

The car should not pull in either direction causing the steering wheel to be OFF center while driving in a straight line on a level surface.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#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 Steering Column Position parameter. As the steering wheel is turned, the reading should travel from -550 to +550°.

1. Ignition ON, verify that DTC C0710 42 or C0710 5A is not present. If either DTC is present, perform the «Steering Angle Sensor Centering»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system__steering-angle-sensor-centering) .
2. Inspect the B99 Steering Wheel Angle Sensor for correct installation. If loose or incorrect installation is diagnosed, correct the installation of the component.
3. Ignition OFF, disconnect the harness connector at the B99 Steering Wheel Angle Sensor.
4. Test for less than 5 ohms between the ground circuit terminal 6 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
5. Ignition ON, test for greater than 11 V between the 12 V reference circuit terminal 5 and ground. If less than the specified range, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K17 Electronic Brake Control Module (EBCM).
6. If all circuits test normal, replace the B99 Steering Wheel Angle Sensor and verify the DTC does not reset. If the DTC resets, replace the module that set the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Angle Sensor Replacement»(/cadillac/srx/ii-2009-2012/remont/steering-column-switches/#steering-wheel-and-steering-column)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for module replacement, setup and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

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

Ignition ON

In internal hardware failure is detected.

1. The electronic brake control module (EBCM) disables the ABS, traction control, and stability control for the duration of the ignition cycle.
2. The ABS indicator turns ON.
3. The traction control/stability control-active indicator turns ON.

1. A current DTC clears when the diagnostic runs and passes.
2. The EBCM will turn OFF the indicators and enable the system functions in the next ignition cycle.

A newly replaced EBCM can set one or more DTC on its initial ignition ON cycle.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, perform the following calibration procedures. Refer to: «Steering Angle Sensor Centering»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system__steering-angle-sensor-centering) «Vehicle Yaw Sensor Learn»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system__vehicle-yaw-sensor-learn) «Brake Pressure Modulator Valve Pressure Sensor Calibration»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system__brake-pressure-modulator-valve-pressure-sensor)
2. Verify that DTC C056D is not present. If DTC C056D is present, replace the module that set the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Steering Angle Sensor Replacement»(/cadillac/srx/ii-2009-2012/remont/steering-column-switches/#steering-wheel-and-steering-column)
2. «Vehicle Yaw Sensor with Vehicle Lateral and Longitudinal Accelerometer Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
3. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for module replacement, setup and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The electronic brake control module (EBCM) must be configured with the security code, CAN configuration data and vehicle options. If not properly configured after installation, the EBCM may set a DTC.

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

Ignition ON

The control module is not properly programmed.

1. The EBCM disables the traction control and stability control for the duration of the ignition cycle.
2. The ABS indicator turns ON.
3. The traction control/stability control-active indicator turns ON.

1. A current DTC clears when the diagnostic runs and passes.
2. The EBCM will turn OFF the indicators and enable the system functions in the next ignition cycle.

A newly replaced EBCM can set one or more DTC on its initial ignition ON cycle.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#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 C056E is not present. If DTC C056E is present, program the module that set the DTC and verify the DTC does not reset.
2. If the DTC resets, replace the module that set the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The wheel speeds are detected by active wheel speed sensors. Each wheel speed sensor receives a 12 V reference voltage from the electronic brake control module (EBCM) and provides an alternating current square wave signal to the EBCM. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed. The EBCM sends the wheel speed information as a high speed controller area network (CAN) serial data message.

Ignition ON

A supervised periodic message that includes the wheel speed serial data has not been received.

Specific subsystems will not function or operate in degraded mode.

A current DTC clears when the diagnostic runs and passes.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#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 EBCM Wheel Speed Sensor parameters. 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).

1. Ignition ON, verify that DTC C0035, C0040, C0045, or C0050 is not present in the EBCM. If any listed DTC is present, refer to «DTC C0035, C0040, C0045, or C0050»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system) to diagnose that DTC prior to this diagnostic.
2. Replace the K17 Electronic Brake Control Module (EBCM) and verify the DTC does not reset. If the DTC resets, replace the module that set the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the ignition is turned ON, the microprocessor runs a diagnostic program to detect an internal fault when power up is commanded. If an internal malfunction is detected, the control module will set a DTC.

Ignition ON

The control module detects an internal malfunction.

Specific subsystems will not function or operate in degraded mode.

A current DTC clears when the diagnostic runs and passes.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, verify that DTC C056D or C056E is not present in the electronic brake control module (EBCM). If any listed DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) to diagnose that DTC prior to this diagnostic.
2. Replace the K17 Electronic Brake Control Module (EBCM) and verify the DTC does not reset. If the DTC resets, replace the module that set the DTC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup and programming

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When traction control is active, the electronic brake control module (EBCM) sends a serial data message to the engine control module (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.

1. The EBCM disables the traction control and stability control for the duration of the ignition cycle.
2. The traction control/stability control-active indicator turns ON.

1. A current DTC clears when the diagnostic runs and passes.
2. The EBCM will turn OFF the indicator in the next ignition cycle.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Verify that no DTCs except P0856 00 are present in the ECM. If any DTC is present, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) .
2. Replace the K20 Engine Control Module and verify the DTC does not reset. If the DTC resets replace the K17 Electronic Brake Control Module (EBCM).

Perform the Diagnostic Repair Verification .

Control Module References

Symptoms - Antilock Brake System

Note. The following steps must be completed before using the symptom tables.

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the system description and operation in order to familiarize yourself with the system functions. Refer to «ABS Description and Operation»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system__abs-description-and-operation) .

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the ABS. Refer to «Checking Aftermarket Accessories»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#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 to 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»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
2. «Traction Control/Stability Control Indicator Malfunction»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system)
3. «Brake Warning Indicator Malfunction»(/cadillac/srx/ii-2009-2012/remont/mechanical-hydraulic/#hydraulic-brake-system)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The instrument cluster turns ON the ABS indicator for 5 seconds after ignition ON or when the electronic brake control module (EBCM) detects a fault and sends a serial data message to the instrument cluster commanding the indicator ON.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Ignition ON, the ABS indicator should turn ON. After 5 seconds the ABS indicator should turn OFF.

1. Ignition ON, with a scan tool command the instrument cluster All Indicators test ON and OFF. Verify the ABS indicator turns ON and OFF. If the ABS indicator does not turn ON and OFF, replace the P16 Instrument Cluster.
2. Verify the ABS indicator turns OFF 5 seconds after ignition ON. If the ABS indicator does not turn OFF, replace the K17 Electronic Brake Control Module (EBCM).

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Instrument Cluster Replacement»(/cadillac/srx/ii-2009-2012/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
2. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for instrument cluster or EBCM replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The instrument cluster illuminates the traction control/stability control-active indicator, winter indicator and stability control off indicator for 5 seconds after ignition ON. The electronic brake control module (EBCM) will request the instrument cluster via serial data to turn the traction control/stability control-active indicator ON (flashing) when the system is in traction control or stability control mode. When the EBCM detects a fault it sends a serial data message to the instrument cluster commanding the traction control/stability control-active indicator ON.

The body control module (BCM) monitors the stability control switch. When the stability control switch is pressed once, the BCM will request the EBCM via serial data to disable the traction control. When the stability control switch is pressed for 5 seconds, the BCM will request the EBCM to disable the stability control. The EBCM will request the instrument cluster via serial data to turn the winter indicator and stability control off indicator ON to notify the driver of the deactivation.

Schematic Reference

Antilock Brake System Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

ABS Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures)
4. «Wiring Repairs»(/cadillac/srx/ii-2009-2012/remont/body-electrical/#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 Instrument Cluster All Indicators test ON and OFF. Verify the traction control/stability control-active indicator, traction control off indicator and stability control off indicator turn ON and OFF. If either indicator does not turn ON and OFF, replace the P16 Instrument Cluster.
2. Observe the scan tool BCM Traction Control Switch parameter while pressing and releasing the traction control switch. Verify the reading changes between Active and Inactive. If the parameter does not change between the specified values, refer to «Circuit/System Testing»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system) .
3. Observe the scan tool EBCM Traction Control System parameter while pressing and releasing the traction control switch. Verify the reading changes between On and Off. If the parameter does not change between the specified values, replace the K9 Body Control Module (BCM).
4. Observe the scan tool EBCM Vehicle Stability System parameter while pressing the traction control switch for 5 seconds and releasing. Verify the reading changes between On and Off. If the parameter does not change between the specified values, replace the K9 Body Control Module (BCM).
5. Observe the traction control off indicator while pressing and releasing the traction control switch. Verify the traction control off indicator turns ON and OFF. If the traction control off indicator does not turn ON and OFF, replace the K17 Electronic Brake Control Module (EBCM).
6. Observe the stability control off indicator while pressing the traction control switch for 5 seconds and releasing. Verify the stability control off indicator turns ON and OFF. If the stability control off indicator does not turn ON and OFF, replace the K17 Electronic Brake Control Module (EBCM).

Note. Circuit/System Verification must be performed before Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the S48E Multi-Function Switch - Center Console.
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 2 and ground. If greater than the specified value, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool BCM Traction Control Switch parameter is Inactive. If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K9 Body Control Module (BCM).
4. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground.
5. Verify the scan tool BCM, 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 K9 Body Control Module (BCM).
6. If all circuits test normal, test or replace the S48E Multi-Function Switch - Center Console.

1. Ignition OFF, disconnect the harness connector at the S48E Multi-Function Switch - Center Console.
2. Test for infinite resistance between the signal circuit terminal 7 and the ground circuit terminal 2 with the switch in the released position. If not within the specified range, replace the S48E Multi-Function Switch - Center Console.
3. Test for less than 5 ohms between the signal circuit terminal 7 and the ground circuit terminal 2 with the switch in the pressed position. If not within the specified range, replace the S48E Multi-Function Switch - Center Console.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

1. «Accessory Switch Replacement»(/cadillac/srx/ii-2009-2012/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
2. «Instrument Cluster Replacement»(/cadillac/srx/ii-2009-2012/remont/gauges-instrument-panels/#instrument-panel-system-displays-gauges)
3. «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for BCM or EBCM replacement, programming and setup

Antilock Brake System Automated Bleed

Note. Before performing the ABS Automated Bleed Procedure, first perform a pressure bleed of the base brake system. Refer to Hydraulic Brake System Bleeding (Manual) or Hydraulic Brake System Bleeding (Pressure) . The automated bleed procedure is recommended when one of the following conditions exist: Base brake system bleeding does not achieve the desired pedal height or feel Extreme loss of brake fluid has occurred Air ingestion is suspected in the secondary circuits of the brake modulator assembly

The ABS Automated Bleed Procedure uses a scan tool to cycle the system solenoid valves and run the pump in order to purge any air from the secondary circuits. These circuits are normally closed off, and are only opened during system initialization at vehicle start up and during ABS operation. The automated bleed procedure opens these secondary circuits and allows any air trapped in these circuits to flow out toward the brake corners.

Performing the Automated Bleed Procedure

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/srx/ii-2009-2012/remont/hoistjack/#general-information) .
2. Remove all four tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation»(/cadillac/srx/ii-2009-2012/remont/wheel-tire-system/#tires-and-wheels) .
3. Inspect the brake system for leaks and visual damage. Refer to «Symptoms - Hydraulic Brakes»(/cadillac/srx/ii-2009-2012/remont/mechanical-hydraulic/#hydraulic-brake-system__symptoms-hydraulic-brakes) . Repair or replace components as needed.
4. Lower the vehicle.
5. Inspect the battery state of charge. Refer to «Battery Inspection/Test»(/cadillac/srx/ii-2009-2012/remont/charging-system/#battery-charging-system-and-starting-system) .
6. Install a scan tool.
7. Turn the ignition ON, with the engine OFF.
8. With the scan tool, establish communications with the ABS system. Select Special Functions. Select Automated Bleed from the Special Functions menu.
9. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/srx/ii-2009-2012/remont/hoistjack/#general-information) .
10. Following the directions given on the scan tool, pressure bleed the base brake system. Refer to «Hydraulic Brake System Bleeding (Manual)»(/cadillac/srx/ii-2009-2012/remont/mechanical-hydraulic/#hydraulic-brake-system) or «Hydraulic Brake System Bleeding (Pressure)»(/cadillac/srx/ii-2009-2012/remont/mechanical-hydraulic/#hydraulic-brake-system) .
11. Follow the scan tool directions until the desired brake pedal height is achieved.
12. If the bleed procedure is aborted, a malfunction exists. Perform the following steps before resuming the bleed procedure: If a DTC is detected, refer to «Diagnostic Trouble Code (DTC) List - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-trouble-code-dtc-list) , and diagnose the appropriate DTC. If the brake pedal feels spongy, perform the conventional brake bleed procedure again. Refer to «Hydraulic Brake System Bleeding (Manual)»(/cadillac/srx/ii-2009-2012/remont/mechanical-hydraulic/#hydraulic-brake-system) «Hydraulic Brake System Bleeding (Pressure)»(/cadillac/srx/ii-2009-2012/remont/mechanical-hydraulic/#hydraulic-brake-system) .
13. When the desired pedal height is achieved, press the brake pedal to inspect for firmness.
14. Lower the vehicle.
15. Remove the scan tool.
16. Install the tire and wheel assemblies. Refer to «Tire and Wheel Removal and Installation»(/cadillac/srx/ii-2009-2012/remont/wheel-tire-system/#tires-and-wheels) .
17. Inspect the brake fluid level. Refer to «Master Cylinder Reservoir Filling»(/cadillac/srx/ii-2009-2012/remont/mechanical-hydraulic/#hydraulic-brake-system__master-cylinder-reservoir-filling) .
18. Road test the vehicle while inspecting that the pedal remains high and firm.

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. Electronic brake control module (EBCM) replacement
2. Steering angle sensor replacement
3. Steering gear replacement
4. Steering column replacement
5. Collision or other physical damage

The steering angle sensor centering procedure can be completed with a scan tool using the following steps

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 P position.
3. Install the scan tool to the data link connector.
4. Ignition ON, engine OFF
5. Select Steering Wheel Angle Sensor Reset in the Steering Wheel Angle Sensor Module Configuration/Reset Functions list.
6. Follow the scan tool directions to complete the learn procedure.
7. Select Steering Wheel Angle Sensor Learn in the Steering Wheel Angle Sensor Module Configuration/Reset Functions list.
8. Follow the scan tool directions to complete the learn procedure.
9. Select Steering Wheel Angle Sensor Learn in the EBCM Configuration/Reset Functions list.
10. Follow the scan tool directions to complete the learn procedure.
11. Clear any DTCs that may be set.

Removal Procedure

1. Place the ignition switch in the OFF position.
2. Without draining the coolant or removing the hoses, remove and position aside the radiator surge tank. Refer to «Radiator Surge Tank Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) .
3. If equipped with the master cylinder heat shield, remove the master cylinder heat shield nuts (1).
4. Remove the master cylinder heat shield bolt (1).
5. Remove the master cylinder heat shield.
6. Clean the electronic brake control module (EBCM) to brake pressure modulator valve (BPMV) area of any dirt or debris.
7. Disconnect the EBCM electrical connector.
8. Remove the EBCM bolts (1).
9. Carefully pull the EBCM (1) from the BPMV.
10. Remove the 12 EBCM seals, if necessary.

Installation Procedure

1. Install the EBCM seals, if removed.
2. Install the EBCM (1) to the BPMV.
3. Install the EBCM bolts (1) and tighten in a cross pattern to 3 N.m (27 lb in).
4. Install the master cylinder heat shield, if equipped.
5. Install the master cylinder heat shield bolt (1) and tighten to 10 N.m (89 lb in).
6. Install the master cylinder heat shield nuts (1) and tighten to 25 N.m (18 lb ft).
7. Install the radiator surge tank. Refer to «Radiator Surge Tank Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) .
8. If installing a new EBCM, program the EBCM. Refer to «Control Module References»(/cadillac/srx/ii-2009-2012/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) .
9. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .

1. Turn the ignition switch to the OFF position.
2. Without draining the coolant or removing the hoses, remove and position aside the radiator surge tank. Refer to «Radiator Surge Tank Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) .
3. If equipped with the master cylinder heat shield, remove the master cylinder heat shield nuts (1).
4. Remove the master cylinder heat shield bolt (1).
5. Remove the master cylinder heat shield.
6. Disconnect the electronic brake control module (EBCM) electrical connector.
7. Disconnect the left rear brake pipe fitting (1) at the brake pressure modulator valve (BPMV).
8. Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
9. Disconnect the right rear brake pipe fitting (2) from the BPMV.
10. Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
11. Disconnect the master cylinder secondary brake pipe fitting (1) from the BPMV.
12. Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.
13. Disconnect the left front brake pipe fitting (2) from the BPMV.
14. Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.
15. Disconnect the right front brake pipe fitting (1) from the BPMV.
16. Cap the brake pipe fitting and plug the BPMV outlet port to prevent brake fluid loss and contamination.
17. Disconnect the master cylinder primary brake pipe fitting (2) from the BPMV.
18. Cap the brake pipe fitting and plug the BPMV inlet port to prevent brake fluid loss and contamination.
19. Remove the BPMV bracket nuts (1).
20. Remove the BPMV and bracket assembly.
21. If necessary, remove the BPMV bracket bolts (1).
22. Remove the BPMV bracket (1).
23. Inspect the insulators for damage and replace, if necessary.
24. If necessary, remove the EBCM. Refer to «Electronic Brake Control Module Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system) .

1. If removed, install the EBCM. Refer to «Electronic Brake Control Module Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system) .
2. Install the BPMV bracket (1), if necessary.
3. If removed, install the BPMV bracket bolts (1) and tighten to 12 N.m (106 lb in).
4. Install the BPMV and bracket assembly.
5. Install the BPMV and bracket assembly nuts (1) and tighten to 10 N.m (89 lb in).
6. Connect the right front brake pipe fitting (1) to the BPMV and tighten to 19 N.m (14 lb ft).
7. Connect the master cylinder primary brake pipe fitting (2) to the BPMV and tighten to 19 N.m (14 lb ft).
8. Connect the master cylinder secondary brake pipe fitting (1) to the BPMV and tighten to 19 N.m (14 lb ft).
9. Connect the left front brake pipe fitting (2) to the BPMV and tighten to 19 N.m (14 lb ft).
10. Connect the left rear brake pipe fitting (1) to the BPMV and tighten to 19 N.m (14 lb ft).
11. Connect the right rear brake pipe fitting (2) to the BPMV and tighten to 19 N.m (14 lb ft).
12. Connect the EBCM electrical connector.
13. Install the master cylinder heat shield, if equipped.
14. Install the master cylinder heat shield bolt (1) and tighten to 10 N.m (89 lb in).
15. Install the master cylinder heat shield nuts (1) and tighten to 25 N.m (18 lb ft).
16. Install the radiator surge tank. Refer to «Radiator Surge Tank Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) .
17. Bleed the hydraulic brake system. Refer to «Hydraulic Brake System Bleeding (Manual)»(/cadillac/srx/ii-2009-2012/remont/mechanical-hydraulic/#hydraulic-brake-system) or «Hydraulic Brake System Bleeding (Pressure)»(/cadillac/srx/ii-2009-2012/remont/mechanical-hydraulic/#hydraulic-brake-system) .
18. Turn the ignition switch to the ON position.
19. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .
20. 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.
21. If the pedal feels spongy, perform the «Antilock Brake System Automated Bleed»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system__antilock-brake-system-automated-bleed) .

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 Brake Pressure Sensor Calibration in the EBCM Configuration/Reset Functions list.
6. Follow the scan tool directions to complete the calibration procedure.
7. Clear any DTCs that may be set.

1. Place the ignition switch in the OFF position.
2. Without draining the coolant or removing the hoses, remove and position aside the radiator surge tank. Refer to «Radiator Surge Tank Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) .
3. Remove the brake pressure modulator valve (BPMV) assembly. Refer to «Brake Pressure Modulator Valve Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system) .
4. Remove the BPMV bracket bolts (1).
5. Remove the BPMV bracket (1).
6. Inspect the bracket insulators for damage and replace, if necessary.

1. Install the BPMV bracket (1).
2. Install the BPMV bracket bolts (1) and tighten to 12 N.m (106 lb in).
3. Install the BPMV assembly. Refer to «Brake Pressure Modulator Valve Replacement»(/cadillac/srx/ii-2009-2012/remont/anti-locktraction-control/#antilock-brake-system-with-traction-control-system-stability-control-system) .
4. Install the radiator surge tank. Refer to «Radiator Surge Tank Replacement (LF1)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) or «Radiator Surge Tank Replacement (LAU)»(/cadillac/srx/ii-2009-2012/remont/cooling-system-mechanical/#engine-cooling-system) .

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 .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/srx/ii-2009-2012/remont/hoistjack/#general-information) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/srx/ii-2009-2012/remont/wheel-tire-system/#tires-and-wheels) .
3. Remove the wheel speed sensor bolt (1).
4. Disconnect the wheel speed sensor electrical connector (1) and release the connector from the steering knuckle.
5. Remove the wheel speed sensor (2) by pulling the sensor straight out of the steering knuckle.

1. Connect the wheel speed sensor electrical connector (1) and secure the connector to the steering knuckle.
2. Install the wheel speed sensor (2) to the steering knuckle.
3. Install the wheel speed sensor bolt (1) and tighten to 9 N.m (80 lb in).
4. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/srx/ii-2009-2012/remont/wheel-tire-system/#tires-and-wheels) .
5. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .

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 .

1. Raise and support the vehicle. Refer to «Lifting and Jacking the Vehicle»(/cadillac/srx/ii-2009-2012/remont/hoistjack/#general-information) .
2. Remove the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/srx/ii-2009-2012/remont/wheel-tire-system/#tires-and-wheels) .
3. Remove the rear suspension link. Refer to «Rear Suspension Link Replacement - Upper to Lower Control Arm»(/cadillac/srx/ii-2009-2012/remont/suspension-rear/#rear-suspension-system) .
4. Remove the wheel speed sensor bolt (1).
5. Remove the wheel speed sensor (1) by pulling the sensor straight out of the rear suspension knuckle.
6. Release the wheel speed sensor harness from the retainers (1).
7. Disconnect the wheel speed sensor electrical connector (1).
8. Release the wheel speed sensor electrical connector retainer and remove the wheel speed sensor.

1. Install the wheel speed sensor connector retainer to the rear suspension cradle.
2. Connect the wheel speed sensor electrical connector (1).
3. Install the wheel speed sensor harness to the retainers (1).
4. Install the wheel speed sensor (1) to the rear suspension knuckle.
5. Install the wheel speed sensor bolt (1) and tighten to 9 N.m (80 lb in).
6. Install the rear suspension link. Refer to «Rear Suspension Link Replacement - Upper to Lower Control Arm»(/cadillac/srx/ii-2009-2012/remont/suspension-rear/#rear-suspension-system) .
7. Install the tire and wheel assembly. Refer to «Tire and Wheel Removal and Installation»(/cadillac/srx/ii-2009-2012/remont/wheel-tire-system/#tires-and-wheels) .
8. Perform the «Diagnostic System Check - Vehicle»(/cadillac/srx/ii-2009-2012/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) .

Vehicle Yaw Sensor Learn

Note. The Multi-axis Acceleration Sensor is also known as the Inertia Sensor Module (IMU) in SPS and the Yaw Rate Sensor in the scan tool. The sensor must be configured using SPS before the vehicle yaw sensor learn is performed.

The multi-axis acceleration sensor requires a SPS configuration and a yaw rate sensor learn. This is required after certain service procedures are performed. Some of these procedures are as follows

1. Electronic brake control module (EBCM) replacement
2. Multi-axis acceleration sensor replacement
3. Vehicle yaw sensor replacement
4. Vehicle yaw sensor with lateral and longitudinal 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. Install the scan tool to the data link connector.
4. Ignition ON, engine OFF
5. Select Yaw Rate Sensor Reset in the Multi-axis Acceleration Sensor Module Configuration/Reset Functions list.
6. Follow the scan tool directions to complete the calibration procedure.
7. Select Yaw Rate Sensor Learn in the Multi-axis Acceleration Sensor Module Configuration/Reset Functions list.
8. Follow the scan tool directions to complete the calibration procedure.
9. Select Yaw Rate Sensor Learn in the EBCM Configuration/Reset Functions list.
10. Follow the scan tool directions to complete the calibration procedure.
11. Clear any DTCs that may be set.

Scheme 4

ABS Description and Operation

This vehicle is equipped with a Continental Teves Mk25 brake system. The electronic brake control module (EBCM) and the brake pressure modulator valve assembly are serviced separately. The brake pressure modulator valve assembly uses a 4 circuit configuration to control hydraulic pressure to each wheel independently.

Depending on options, the following vehicle performance enhancement systems are provided.

1. Antilock brake system (ABS)
2. Traction control
3. Stability control
4. Dynamic rear proportioning
5. Hill start assist
6. Hydraulic brake assist
7. Trailer stability assist
8. Optimized hydraulic braking system

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

1. EBCM - The EBCM controls the system functions and detects failures. It supplies voltage to the solenoid valves and pump motor.
2. Brake pressure modulator valve assembly - The brake pressure modulator valve assembly contains the following components: Hydraulic pump with pump motor Four isolation vales Four dump valves Two traction control/stability control supply valves Two traction control/stability control isolation valves Pressure sensor High pressure accumulators Low pressure accumulator

1. Multi-axis acceleration sensor - The yaw rate, lateral acceleration and longitudinal acceleration sensors are combined into one multi-axis acceleration 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.
2. Steering angle sensor - The EBCM receives serial data message inputs from the steering angle sensor. The steering angle sensor signal is used to calculate the desired yaw rate.
3. Traction control switch - Traction control and stability control are manually disabled or enabled by pressing the traction control switch.
4. Wheel speed sensors - The EBCM sends a 12V reference voltage to each wheel speed sensor. As the wheel spins, the wheel speed sensor produces an alternating current square wave signal. The EBCM uses the frequency of the square wave signal to calculate the wheel speed.

ABS

When wheel slip is detected during a brake application, an ABS event occurs. During ABS 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 ABS 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 EBCM responds to wheel speed sensor inputs and attempts to prevent wheel slip. These pedal pulsations are present only during ABS 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 ABS braking on dry pavement, intermittent chirping noises may be heard as the tires approach slipping. These noises and pedal pulsations are considered normal during ABS 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.

When drive wheel slip is noted, the EBCM will enter traction control mode.

First, the EBCM requests the engine control module (ECM) to reduce the amount of torque to the drive wheels via a serial data message. The ECM reduces torque to the drive wheels and reports the amount of delivered torque.

If the engine torque reduction does not reduce drive wheel slip, the EBCM will actively apply the brakes on the slipping drive wheel. During traction control braking, hydraulic pressure in each drive wheel circuit is controlled to prevent the drive wheels from slipping. The EBCM commands the pump motor and appropriate solenoid valves ON and OFF to apply brake pressure to the slipping wheel.

Traction control can be manually disabled or enabled by pressing the traction control switch.

Stability control provides added stability during aggressive maneuvers. Yaw rate is the rate of rotation about the vehicle's vertical axis. The stability control is activated when the 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 the following inputs

1. Steering wheel position
2. Vehicle speed
3. Lateral acceleration

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.

Stability control activations generally occur in turns during aggressive driving. When braking during stability control activation, the brake pedal may pulsate.

Stability control can be manually disabled or enabled by pressing the traction control switch for 5 s.

Dynamic Rear Proportioning

The dynamic rear proportioning is a control system that replaces the mechanical proportioning valve. Under certain driving conditions the EBCM will reduce the rear wheel brake pressure by commanding the appropriate solenoid valves ON and OFF.

Hill Start Assist

The hill start assist allows the driver to launch his vehicle without a roll back while he is moving his 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 his 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. Clutch switch
7. Accelerator pedal position
8. Vehicle speed

Hydraulic Brake Assist

The hydraulic brake assist function is designed to support the driver in emergency braking situations.

The EBCM receives inputs from the brake pressure sensor. When the EBCM senses an emergency braking situation, it will actively increase the hydraulic brake pressure to a specific maximum by turning the pump motor ON.

Trailer Stability Assist

The trailer stability assist will detect any vehicle yaw instability, caused by an attached trailer. When instability is detected, the EBCM attempts to correct the vehicle's yaw motion by applying brake pressure to one or more of the wheels. The engine torque may be reduced also, if it is necessary to slow down the vehicle.

Optimized Hydraulic Braking System

With some engines the EBCM monitors the vacuum in the brake booster with a vacuum sensor and controls a brake booster vacuum pump depending on vacuum sensor input. It also has a hydraulic brake boost feature which supplements the brake system to maintain consistent brake performance under conditions of low brake booster vacuum. Low brake booster vacuum conditions can include initial start up after the vehicle has been parked for several hours, very frequent brake stops, or high altitude driving. The hydraulic brake boost system activates only during a brake apply under low vacuum conditions. In this case the EBCM will actively increase and control the hydraulic brake pressure by turning the pump motor ON and the appropriate solenoid valves ON and OFF. When hydraulic brake boost is active, a series of rapid pulsations is felt in the brake pedal.

Driver Information Indicators

Brake Warning Indicator

The instrument cluster turns the brake warning indicator ON when the following occurs

1. The instrument cluster performs the bulb check.
2. The EBCM detects a fault and sends a serial data message to the instrument cluster requesting illumination.
3. The body control module (BCM) detects that the park brake is engaged. The instrument cluster receives a serial data message from the BCM requesting illumination.

ABS Indicator

The instrument cluster turns the ABS indicator ON when the following occurs

1. The instrument cluster performs the bulb check.
2. The EBCM detects a malfunction which disables the ABS and sends a serial data message to the instrument cluster requesting illumination.

Traction Control/Stability Control Active Indicator

The instrument cluster turns the traction control/stability control-active indicator ON when the following occurs

1. The instrument cluster performs the bulb check.
2. The ABS system is in traction control or stability control mode.
3. The EBCM detects a malfunction which disables the traction control or stability control and sends a serial data message to the instrument cluster requesting illumination.

Traction Control Off Indicator

The instrument cluster turns the traction control off indicator ON when the following occurs

1. The instrument cluster performs the bulb check.
2. The driver manually disables the traction control by pressing the traction control switch. The EBCM sends a serial data message to the instrument cluster requesting illumination.

Stability Control Off Indicator

The instrument cluster turns the stability control off indicator ON when the following occurs

1. The instrument cluster performs the bulb check.
2. The driver manually disables the stability control by pressing the traction control switch. The EBCM sends a serial data message to the instrument cluster requesting illumination.

Special Tools

Illustration Tool Number/Description J 35616 GM-Approved Terminal Test Kit J 39700 100-Pin Breakout Box J 39700-300 ABS Breakout Box Adapter J 39700-530 5.3 Bosch ABS Breakout Box Adapter

Scheme 5

Scheme 6

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• Component Connector End Views
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Accessory Switch Replacement
• Symptoms - Lighting
• Brake Pedal Position Sensor Calibration
• Brake Pedal Position Sensor Replacement
• Multi-Axis Acceleration Sensor Module Programming and Setup
• Diagnostic Trouble Code (DTC) List - Vehicle
• Steering Angle Sensor Replacement
• Checking Aftermarket Accessories
• Brake Warning Indicator Malfunction
• Brake Fluid Irritant Warning
• Brake Fluid Effects on Paint and Electrical Components Caution
• Lifting and Jacking the Vehicle
• Tire and Wheel Removal and Installation
• Symptoms - Hydraulic Brakes
• Battery Inspection/Test
• Master Cylinder Reservoir Filling
• Radiator Surge Tank Replacement (LF1)
• Fastener Caution
• Brake Dust Warning
• Rear Suspension Link Replacement - Upper to Lower Control Arm
• Front Floor Console Rear Compartment Replacement
• Electronic Brake Control Module Programming and Setup
• DTC B2745
• ABS Description and Operation
• Brake Pressure Modulator Valve Pressure Sensor Calibration
• Vehicle Yaw Sensor Learn
• Steering Angle Sensor Centering
• Antilock Brake System Automated Bleed