Tcs/esp: Other Saab 9-5 II

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 applied brake pressure 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

Cornering brake control

Cornering brake control is a slip control function that is intended to improve the vehicle's lateral/yaw stability during combined braking and cornering situations.

The EBCM will reduce the brake pressure to the inside wheels by commanding the appropriate solenoid valves ON and OFF.

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, the EBCM will actively increase the brake pressure to a specific maximum.

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.

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 faulty pump motor, solenoid valves, an internal hardware failure or a too high or too low battery voltage and sends a serial data message to the instrument cluster requesting illumination.
3. The body control module (BCM) detects that the parking 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 traction control/stability control disabling malfunction 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.

TCS/ESP DTC INDEX

Electrical Information Reference

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Circuit/System Verification

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).

Repair Instructions

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for module replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Observe the scan tool BCM Traction Control Switch parameter while pressing and releasing the traction control switch. The reading should change between Yes and No.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «SPORT MODE SWITCH REPLACEMENT»(ref-653642-S32049141402014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for BCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Ignition ON, observe the scan tool 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).

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «FRONT WHEEL SPEED SENSOR REPLACEMENT (GNA)»(ref-653657-S37392728442014090100000) or «FRONT WHEEL SPEED SENSOR REPLACEMENT (GNB)»(ref-653657-S36107713202014090100000)
2. «REAR WHEEL SPEED SENSOR REPLACEMENT»(ref-653657-S07679402902014090100000)
3. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for EBCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «ELECTRONIC BRAKE CONTROL MODULE REPLACEMENT»(ref-653657-S00029275252014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for EBCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Ignition ON, observe the scan tool Brake Pressure Sensor parameter. The reading should be 0 V, when brake pedal is released and greater than 1 V, when the brake pedal is applied.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for module replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «VEHICLE YAW SENSOR WITH VEHICLE LATERAL AND LONGITUDINAL ACCELEROMETER REPLACEMENT»(ref-653657-S36767249492014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for EBCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for module replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Ignition ON, observe the scan tool 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).

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for EBCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Ignition ON, observe the scan tool Lateral Acceleration Signal and Yaw Rate Sensor parameter. On a level surface, the readings should be 0 V.
2. Observe the scan tool Steering Column Position parameter. As the steering wheel is turned, the reading should travel from -450 to +450°.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «VEHICLE YAW SENSOR WITH VEHICLE LATERAL AND LONGITUDINAL ACCELEROMETER REPLACEMENT»(ref-653657-S36767249492014090100000)
2. «STEERING WHEEL POSITION SENSOR REPLACEMENT»(ref-653657-S03792697552014090100000)
3. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for EBCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Inspect for proper brake fluid level. The fluid level should be above minimum level. ==> If it is low, refer to «BRAKE FLUID LOSS»(ref-653650-S06568534492014090100000) .
2. Ignition ON, read the diagnostic tool values for the brake fluid level sensor parameters. The values should be OK.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «BRAKE FLUID LEVEL INDICATOR SWITCH REPLACEMENT»(ref-653650-S04859108632014090100000)
2. See «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for EBCM replacement, setup and programming.

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Ignition ON, observe the scan tool Inlet, Outlet, Isolation, and Prime Solenoid Valve Feedback parameters. The readings should be Inactive.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «ELECTRONIC BRAKE AND TRACTION CONTROL MODULE WITH BRAKE PRESSURE MODULATOR VALVE REPLACEMENT»(ref-653657-S06112879642014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for EBCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

1. Ignition OFF, depress and release the brake pedal several times to ventilate the brake servo.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Ignition ON, observe the scan tool Steering Column Position parameter. As the steering wheel is turned, the reading should travel from -550 to +550°.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «STEERING WHEEL POSITION SENSOR REPLACEMENT»(ref-653657-S03792697552014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for EBCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for EBCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for EBCM replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for EBCM replacement, setup and programming.

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Ignition ON, observe the EBCM scan tool 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).

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for module replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for module replacement, setup and programming

1. «CIRCUIT TESTING»(ref-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

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.
2. If either indicator does not turn ON and OFF, replace the P16 Instrument Cluster.
3. 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.
4. If the parameter does not change between the specified values, refer to «CIRCUIT/SYSTEM TESTING»(ref-653657-S09395304722014090100000) .
5. Observe the scan tool EBCM Traction Control Switch parameter while pressing and releasing the traction control switch. Verify the reading changes between Active and Inactive.
6. If the parameter does not change between the specified values, replace the K9 Body Control Module.
7. Observe the traction control off indicator while pressing and releasing the traction control switch. Verify the traction control off indicator turns ON and OFF.
8. If the traction control off indicator does not turn ON and OFF, replace the K17 Electronic Brake Control Module.
9. Observe the stability control off indicator while pressing the traction control switch for 5 s and releasing. Verify the stability control off indicator turns ON and OFF.
10. If the stability control off indicator does not turn ON and OFF, replace the K17 Electronic Brake Control Module.

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

1. «SPORT MODE SWITCH REPLACEMENT»(ref-653642-S32049141402014090100000)
2. «CONTROL MODULE REFERENCES»(ref-653639-S11210668452014090100000) for 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-653639-S05362277832014090100000) 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-653657-S19563878412014090100000) .

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-653659-S30091259062014090100000)
2. «CONNECTOR REPAIRS»(ref-653659-S33681896522014090100000)
3. «TESTING FOR INTERMITTENT CONDITIONS AND POOR CONNECTIONS»(ref-653659-S19761557662014090100000)
4. «WIRING REPAIRS»(ref-653659-S03227166852014090100000)

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

Perform the DIAGNOSTIC REPAIR VERIFICATION after completing the diagnostic procedure.

CONTROL MODULE REFERENCES for instrument cluster or EBCM replacement, setup and programming

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

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. Connect 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.

Scheme 5

Scheme 6

Scheme 7

Vehicle Yaw Sensor Learn

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

1. Electronic brake control module (EBCM) replacement
2. Yaw rate 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. Connect 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 8

Master Electrical Component List

Link to end views of connectors: COMPONENT CONNECTOR END VIEWS

List of components

Scheme 9

Scheme 10

VEHICLES CONCERNED

Saab 9-5 MY10 - MY11.

BACKGROUND

An implementation error in the EBCM causes "diagnostic failed" to be sent, without EBCM setting any DTC (can happen during slippery road conditions).

ECM will set DTC's C1221-00 and C1222-00 due to this.

The problem will be solved with an EBCM software update for MY12.

CONDITIONS

DTCs C1221-00 and C1222-00 for wheel speed sensors.

ACTION

For cars MY10-11 there is no software solution for the moment. Short term solution for the dealers is to ignore the DTC's C1221-00 and C1222-00 set in ECM for wheel speed sensors, if not EBCM sets DTC's for the same reason.

Do not replace any components software update will be released in due course.