Tcs/esp: Other Saab 9-4X I

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.

Traction Control

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

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.

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 lamp 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 lamp illumination.

Electrical Information Reference

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Circuit/System Verification

1. Ignition ON
2. Observe the parameter for the body control module's traction control contact on the diagnostic tool when this contact is depressed and released. The reading should change between Active and Inactive.
3. If the reading does not change between Active and Inactive
4. Refer to «CIRCUIT/SYSTEM TESTING»(ref-652262-S14248302452014082300000) below.
5. If the reading changes between Active and Inactive
6. All OK

Repair Instructions

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

1. «ACCESSORY SWITCH REPLACEMENT»(ref-652250-S20712383822014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for replacement, programming and setup of K9 body control module

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

1. Drive the vehicle in a straight line at a speed greater than 20 km/h (13 mph).
2. Verify all scan tool Wheel Speed Sensor parameters are within 1.6 km/h 1 mph of each other.
3. All OK

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «FRONT WHEEL SPEED SENSOR REPLACEMENT»(ref-652262-S02428665962014082300000)
2. «REAR WHEEL SPEED SENSOR REPLACEMENT»(ref-652262-S02330115412014082300000)
3. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for EBCM replacement, programming and setup

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

1. «BRAKE PRESSURE MODULATOR VALVE REPLACEMENT»(ref-652262-S20011013052014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for EBCM replacement, programming and setup

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Note. Troubleshoot all other brake light-related DTCs or symptoms before starting this troubleshooting procedure.

1. Ignition ON
2. Confirm that DTC C0131 is not set.
3. If this DTC is set: 3.1. Execute «BRAKE PRESSURE MODULATION VALVE PRESSURE SENSOR, CALIBRATION»(ref-652262-S14798963572014082300000) . 3.2. Verify that the DTC is not set. 3.3. If the DTC is set, replace Q5 brake pressure modulation valve. 3.4. If the DTC is not set: 3.5. All OK
4. If the DTC is not set
5. All OK

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

1. «BRAKE PRESSURE MODULATOR VALVE REPLACEMENT»(ref-652262-S20011013052014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for replacement, programming and setup of the electronic brake control module.

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Note. Troubleshoot all brake light-related DTCs or symptoms before starting the troubleshooting procedure below.

1. Ignition OFF, verify that the pedal position sensor or the brake pedal is fitted correctly and not caused by detection of residual brake pressure.
2. If a problem is discovered: Repair or replace the affected component.
3. If there is no problem
4. Switch ON the ignition, execute «CALIBRATION OF BRAKE PEDAL POSITION SENSOR»(ref-652253-S24781064862014082300000) .
5. Verify that no DTC is generated.
6. If DTC is generated: Replace K17 electronic brake control module.
7. If DTC is not generated
8. All OK.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «BRAKE PEDAL POSITION SENSOR REPLACEMENT»(ref-652253-S00368190012014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for control module replacement, setup and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION

1. «VEHICLE YAW SENSOR WITH VEHICLE LATERAL AND LONGITUDINAL ACCELEROMETER REPLACEMENT»(ref-652262-S05124417172014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for EBCM or Multi-axis Acceleration Sensor replacement, programming and setup

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

1. Perform the «DIAGNOSTIC REPAIR VERIFICATION»(ref-652232-S34866060852014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for EBCM or ECM replacement, programming and setup

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

1. «BRAKE PRESSURE MODULATOR VALVE REPLACEMENT»(ref-652262-S20011013052014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for replacement, programming and setup of the electronic brake control module (EBCM).

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

1. Verify that DTC C056D is not set.
2. If the DTC is set in a control module that can be programmed, program the control module. If the DTC resets, replace the control module that set the DTC.
3. If the DTC is set in a control module that cannot be programmed, replace the control module that set the DTC.
4. If the DTC is set in a sensor, replace the sensor that set the DTC.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for module or sensor replacement, programming and setup

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

1. Ignition ON
2. Verify that DTC C056E has not been generated.
3. If the DTC C056E has been generated: 3.1. Program K17 electronic brake control module. 3.2. Confirm that the DTC is not generated after having run the vehicle over 40 km/h (25 mph). 3.3. If a DTC is generated, replace K17 the electronic brake control module. 3.4. If DTC is not generated: 3.5. All OK.
4. If DTC is not generated
5. All OK.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

CONTROL MODULE REFERENCES for replacement, programming and setup of the electronic brake control module.

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

1. Ignition ON
2. Verify that the diagnostic tool parameter Steering column position matches the actual position of the steering wheel when the steering wheel is turned full lock to lock between -550° and +550°.
3. Ignition ON, verify that DTC C056D or C056E is not set.
4. If the parameter does not match the actual position of the steering wheel, or if the reading is incorrect: Refer to «CIRCUIT/SYSTEM TESTING»(ref-652262-S07534005272014082300000) below.
5. If the parameter matches the actual position of the steering wheel: All OK

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

1. «STEERING ANGLE SENSOR REPLACEMENT»(ref-652245-S18702870262014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for electronic brake control module replacement, programming and setup

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Ignition ON, observe the scan tool EBCM Wheel Speed Sensor parameters. The readings for all sensors should indicate the same speed when driving in a straight line at a speed greater than 20 km/h (13 mph).

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

CONTROL MODULE REFERENCES for module replacement, setup and programming

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

CONTROL MODULE REFERENCES for control module replacement, setup and programming.

Symptoms - Antilock Brake System

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

1. Perform the «DIAGNOSTIC SYSTEM CHECK - VEHICLE»(ref-652232-S33658475782014082300000) 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»(ref-652262-S06016910242014082300000) .

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS .

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

1. Ignition ON
2. Verify that no DTCs have been generated.
3. If DTC(s) has (have) been generated
4. See «DIAGNOSTIC TROUBLE CODE (DTC) LIST - VEHICLE»(ref-652232-S23450649802014082300000)
5. If no DTCs are present
6. Verify that the ABS indication in the instrument cluster comes on and goes off when you run the function 'All indications On - OFF' using the diagnostic tool.
7. If the ABS indication does not come on and go off
8. Replace the instrument cluster.
9. If the ABS indication comes on and goes off
10. Verify that the ABS light goes off 5 seconds after ignition ON.
11. If the ABS light does not go off
12. Replace the electronic brake control module K17
13. If the ABS light goes off
14. All OK.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

1. «INSTRUMENT CLUSTER REPLACEMENT»(ref-652250-S29365086422014082300000)
2. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for replacement, programming and setup of instrument cluster and electronic brake control module

1. «CIRCUIT TESTING»(ref-652238-S32451086822014082300000)
2. «CONNECTOR REPAIRS»(ref-652238-S24409892572014082300000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-652238-S35849067632014082300000)
4. «WIRING REPAIRS»(ref-652238-S13433242552014082300000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the repair.

1. «ACCESSORY SWITCH REPLACEMENT»(ref-652250-S20712383822014082300000)
2. «INSTRUMENT CLUSTER REPLACEMENT»(ref-652250-S29365086422014082300000)
3. «CONTROL MODULE REFERENCES»(ref-652232-S11179918262014082300000) for BCM or EBCM replacement, programming and setup

Time studies - ABS/TCS

Correction

1. 01 - Replacement
2. 02 - Removal - Refit
3. 03 - Renovate
4. 04 - Paint
5. 05 - Adjust
6. 06 - Change comp. unit
7. 07 - Lubricate - Clean - Polish
8. 08 - Check/Fault search
9. 09 - Expose
10. 10 - Install new
11. 11 - Transfer

Antilock Brake System Automated Bleed

Refer to BRAKE FLUID IRRITANT WARNING .

Refer to CAUTION: EFFECTS OF BRAKE FLUID ON PAINT AND ELECTRICAL COMPONENTS .

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. WARNING: The Auto Bleed Procedure may be terminated at any time during the process by pressing the EXIT button. No further Scan Tool prompts pertaining to the Auto Bleed procedure will be given. After exiting the bleed procedure, relieve bleed pressure and disconnect bleed equipment per manufacturers instructions. Failure to properly relieve pressure may result in spilled brake fluid causing damage to components and painted surfaces. Raise and support the vehicle. Refer to «LIFTING AND JACKING THE VEHICLE»(ref-652230-S26645367622014082300000) .
2. Remove all four tire and wheel assemblies. Refer to «TIRE AND WHEEL REMOVAL AND INSTALLATION»(ref-652234-S18162824462014082300000) .
3. Inspect the brake system for leaks and visual damage. Refer to «SYMPTOMS - HYDRAULIC BRAKES»(ref-652242-S36598281282014082300000) . Repair or replace components as necessary.
4. Lower the vehicle.
5. Inspect the battery state of charge. Refer to «BATTERY INSPECTION/TEST»(ref-652241-S10109234482014082300000) .
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»(ref-652230-S26645367622014082300000) .
10. Following the directions given on the scan tool, pressure bleed the base brake system. Refer to «HYDRAULIC BRAKE SYSTEM BLEEDING (MANUAL)»(ref-652242-S26496361782014082300000) or «HYDRAULIC BRAKE SYSTEM BLEEDING (PRESSURE)»(ref-652242-S15656701082014082300000) .
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»(ref-652232-S23450649802014082300000) , 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)»(ref-652242-S26496361782014082300000) or «HYDRAULIC BRAKE SYSTEM BLEEDING (PRESSURE)»(ref-652242-S15656701082014082300000) .
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»(ref-652234-S18162824462014082300000) .
17. Inspect the brake fluid level. Refer to «MASTER CYLINDER RESERVOIR FILLING»(ref-652242-S32873003812014082300000) .
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 Reset 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.

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 43

Scheme 44

Scheme 45

Scheme 46