Antilock Brake System, Traction Control System & Stability Control System: Removal & Installation Cadillac STS I

Removal Procedure

1. Turn OFF the ignition.
2. Raise and support vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-197567-S01952905382005101200000) in General Information.
3. Remove the air deflector shield. Refer to «Air Deflector Replacement - Front»(ref-197566-S09922059352005101200000) in Body Front End.
4. Remove the right front wheelhouse liner. Refer to «Fender, Fender Insulator, Wheelhouse Liner Replacement - Front»(ref-197566-S11332856662005101200000) in Body Front End.
5. Remove the washer solvent container bracket. Refer to «Solvent Container, Pump, Level Sensor Replacement - Windshield Washer»(ref-197570-S09818445652005101200000) in Wipers/Washer Systems.
6. Thoroughly clean all of the contaminants from and around the EBCM assembly.
7. Press the retainer on the EBCM electrical connector (1).
8. Rotate the EBCM connector tab (2) forward to the unlocked position.
9. Disconnect the EBCM electrical connector (1) from the EBCM and position out of the way.
10. Remove and discard the 4 EBCM to brake pressure modulator valve (BPMV) screws (1).
11. Clean the surface of the EBCM/BPMV assembly.
12. Separate the EBCM (1) from the BPMV (2).

Installation Procedure

1. Clean the seal surface of the BPMV (2).
2. Install the EBCM (1) to the BPMV (2).
3. Make sure that the internal pump motor connector (3) is installed into the new EBCM (1) prior to EBCM replacement.
4. Install the 4 NEW EBCM to BPMV screws. Tighten: Tighten the 4 NEW EBCM to BPMV screws in sequence (1-4) to 5 N.m (44 lb in).
5. Connect the EBCM electrical connector (1) to the EBCM (3).
6. Rotate the EBCM connector tab (2) rearward to the locked position.
7. Install the washer solvent container bracket. Refer to «Solvent Container, Pump, Level Sensor Replacement - Windshield Washer»(ref-197570-S09818445652005101200000) in Wipers/Washer Systems.
8. Install the wheelhouse liner. Refer to «Fender, Fender Insulator, Wheelhouse Liner Replacement - Front»(ref-197566-S11332856662005101200000) in Body Front End.
9. Install the air deflector shield. Refer to «Air Deflector Replacement - Front»(ref-197566-S09922059352005101200000) in Body Front End.
10. Lower the vehicle.
11. Use the scan tool in order to clear the DTCs.
12. If installing a new EBCM it is necessary to program the EBCM. Refer to «Service Programming System (SPS)»(ref-197540-S04668130452005101200000) in Programming and Setup.
13. Perform the Diagnostic System Check - Vehicle. Refer to «Diagnostic System Check - Vehicle»(ref-197532-S30271296932005101200000) in Vehicle DTC Information.
14. Recalibrate the brake pedal position sensor. Refer to «Brake Pedal Position Sensor Replacement»(ref-197547-S22427895342005101200000) in Lighting Systems.

Brake Pressure Modulator Valve (BPMV) Replacement

1. Turn OFF the ignition.
2. Thoroughly clean all contaminants from around the EBCM.
3. Remove the 2 master cylinder brake pipes (3) from the BPMV (1).
4. Clean any brake fluid spillage from the BPMV (1).
5. Raise and support vehicle. Refer to «Lifting and Jacking the Vehicle»(ref-197567-S01952905382005101200000) in General Information.
6. Remove the air deflector shield. Refer to «Air Deflector Replacement - Front»(ref-197566-S09922059352005101200000) in Body Front End.
7. Remove the wheelhouse liner. Refer to «Fender, Fender Insulator, Wheelhouse Liner Replacement - Front»(ref-197566-S11332856662005101200000) in Body Front End.
8. Remove the washer solvent container bracket. Refer to «Solvent Container, Pump, Level Sensor Replacement - Windshield Washer»(ref-197570-S09818445652005101200000) in Wipers/Washer Systems.
9. Remove the 4 wheel brake pipes (2) from the BPMV (1).
10. Press the retainer on the EBCM electrical connector (1).
11. Rotate the EBCM connector tab (2) forward to the unlocked position.
12. Disconnect the EBCM electrical connector (1) from the EBCM and position out of the way.
13. Remove the front BPMV bracket nuts.
14. Remove the EBCM/BPMV assembly (1) from the BPMV bracket.
15. Remove and discard the 4 EBCM to BPMV screws.
16. Clean the surface of the EBCM/BPMV assembly.
17. Remove the EBCM (1) from the BPMV (2).

1. Clean the seal surface of the BPMV.
2. Install the EBCM (1) to the BPMV (2).
3. Make sure that the internal pump motor connector (3) is installed into the new EBCM (1) prior to EBCM replacement.
4. Install the 4 NEW EBCM to BPMV screws. Tighten: Tighten the 4 NEW EBCM to BPMV screws in sequence (1-4) to 5 N.m (44 lb in).
5. Install the EBCM/BPMV assembly (1) to the BPMV bracket.
6. Install the BPMV bracket nuts (2). Tighten: Tighten the BPMV nuts to 10 N.m (89 lb in).
7. Connect the EBCM electrical connector (1) to the EBCM (2).
8. Rotate the EBCM connector tab (2) rearward to the locked position.
9. Install the 4 wheel brake pipes (2) to the BPMV (1) using the locations recorded during the removal procedure. Tighten: Tighten the wheel brake pipes to 27 N.m (20 lb ft).
10. Install the washer solvent container bracket. Refer to «Solvent Container, Pump, Level Sensor Replacement - Windshield Washer»(ref-197570-S09818445652005101200000) in Wipers/Washer Systems.
11. Install the wheelhouse liner. Refer to «Fender, Fender Insulator, Wheelhouse Liner Replacement - Front»(ref-197566-S11332856662005101200000) in Body Front End.
12. Install the air deflector shield. Refer to «Air Deflector Replacement - Front»(ref-197566-S09922059352005101200000) in Body Front End.
13. Lower the vehicle.
14. Install the 2 master cylinder brake pipes (3) to the BPMV (1) using the locations recorded during the removal procedure. Tighten: Tighten the master cylinder brake pipes to 27 N.m (20 lb ft).
15. If equipped with a brake fluid pressure sensor (4), connect the electrical connector.
16. Fill and bleed the hydraulic brake system. Refer to «Master Cylinder Reservoir Filling»(ref-197584-S19930507662005101200000) and «Hydraulic Brake System Bleeding (Manual)»(ref-197584-S03459483362005101200000) or «Hydraulic Brake System Bleeding (Pressure)»(ref-197584-S23113217582005101200000) in Hydraulic Brakes.
17. Perform the Auto Bleed Procedure. Refer to «ABS Automated Bleed Procedure»(ref-197552-S39085916982005101200000) .
18. Perform the System Check-Vehicle. Refer to «Diagnostic System Check - Vehicle»(ref-197532-S30271296932005101200000) in Vehicle DTC Information.

1. Thoroughly clean all contaminants from around the EBCM.
2. Disconnect the brake fluid pressure sensor electrical connector (3) from the brake fluid pressure sensor (2).
3. Remove the brake fluid pressure sensor (2) from the EBCM (1).

1. Install the brake fluid pressure sensor (2) to the EBCM (1). Tighten: Tighten the brake fluid pressure sensor to 17 N.m (13 lb ft).
2. Connect the brake fluid pressure sensor electrical connector (3) to the brake fluid pressure sensor (2).
3. Fill and bleed the hydraulic brake system. Refer to «Master Cylinder Reservoir Filling»(ref-197584-S19930507662005101200000) and «Hydraulic Brake System Bleeding (Manual)»(ref-197584-S03459483362005101200000) or «Hydraulic Brake System Bleeding (Pressure)»(ref-197584-S23113217582005101200000) in Hydraulic Brakes.
4. Perform the Auto Bleed Procedure. Refer to «ABS Automated Bleed Procedure»(ref-197552-S39085916982005101200000) .
5. Perform the Diagnostic System Check - Vehicle. Refer to «Diagnostic System Check - Vehicle»(ref-197532-S30271296932005101200000) in Vehicle DTC Information.

1. Remove the console shift lever bezel. Refer to «Console Shift Lever Bezel Replacement»(ref-197555-S17726097332005101200000) in Instrument Panel, Gages, and Console.
2. Disconnect the traction control electrical connector.
3. Remove the trim plate.
4. Remove the two traction control mounting screws (1).
5. Remove the traction control switch (2).

1. Install the traction control switch (2) to the trim plate.
2. Install the two traction control mounting screws (1). Tighten: Tighten the two traction control mounting screws to 2 N.m (18 lb in).
3. Connect the traction control electrical connector.
4. Install the console shift lever bezel. Refer to «Console Shift Lever Bezel Replacement»(ref-197555-S17726097332005101200000) in Instrument Panel, Gages, and Console.

1. Turn OFF the ignition.
2. To access the yaw rate sensor/lateral accelerometer move the passenger seat rearward.
3. Carefully lift the carpet by the seam.
4. Remove the 2 yaw rate sensor/lateral accelerometer mounting nuts (2).
5. Disconnect the yaw rate sensor/lateral accelerometer electrical connector (2) from the yaw rate sensor/lateral accelerometer.
6. Remove the yaw rate sensor/lateral accelerometer (1).

1. Install the yaw rate sensor/lateral accelerometer (1).
2. Install the 2 yaw rate sensor/lateral accelerometer nuts (2). Tighten: Tighten the yaw rate sensor/lateral accelerometer mounting nuts to 9 N.m (80 lb in).
3. Connect the yaw rate sensor/lateral accelerometer electrical connector (2) to the yaw rate sensor/lateral accelerometer (1).
4. Perform the System Check-Vehicle. Refer to «Diagnostic System Check - Vehicle»(ref-197532-S30271296932005101200000) in Vehicle DTC Information.

1. Turn OFF the ignition.
2. To access the yaw rate sensor/lateral and longitudinal accelerometer move the passenger seat rearward.
3. Carefully lift the carpet by the seam.
4. Remove the 2 yaw rate sensor/lateral and longitudinal accelerometer mounting nuts (2).
5. Disconnect the yaw rate sensor/lateral and longitudinal accelerometer electrical connector (2) from the yaw rate sensor/lateral and longitudinal accelerometer.
6. Remove the yaw rate sensor/lateral and longitudinal accelerometer (1).

1. Install the yaw rate sensor/lateral and longitudinal accelerometer (1).
2. Install the 2 yaw rate sensor/lateral and longitudinal accelerometer nuts (2). Tighten: Tighten the yaw rate sensor/lateral and longitudinal accelerometer mounting nuts to 9 N.m (80 lb in).
3. Connect the yaw rate sensor/lateral and longitudinal accelerometer electrical connector (2) to the yaw rate sensor/lateral and longitudinal accelerometer (1).
4. Perform the System Check-Vehicle. Refer to «Diagnostic System Check - Vehicle»(ref-197532-S30271296932005101200000) in Vehicle DTC Information.

Scheme 11

Scheme 12

This vehicle is equipped with the DBC7.2 antilock braking system.

The vehicle is equipped with the following braking systems

1. Antilock Brake System (ABS)
2. Engine Drag Control (EDC)
3. Dynamic Rear Proportioning (DRP)
4. Traction Control System (TCS)
5. Vehicle Stability Enhancement System (VSES) (w/JL4)

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

1. Electronic Brake Control Module (EBCM) - The EBCM controls the system functions and detects failures. The EBCM contains the following components: System Relay - The system relay is energized when the ignition is ON and no ABS DTCs are present. It supplies battery positive voltage to the solenoid valves and pump motor. Vent Tube - The vent tube, located in the EBCM connector, is an opening to the internal cavity of the EBCM. It allows ventilation of the EBCM internals.
2. Brake Pressure Modulator Valve (BPMV) - The BPMV contains the hydraulic valves and pump motor that are controlled electrically by the EBCM. The BPMV uses a 4 circuit configuration with a diagonal split. The BPMV directs fluid from the reservoir of the master cylinder to the left front and right rear wheels and fluid from the other reservoir to the right front and left rear wheels. The diagonal circuits are hydraulically isolated so that a leak or malfunction in one circuit will allow continued braking ability on the other. IMPORTANT: There is a rubber isolator located under the BPMV and on the mounting studs. The rubber isolators protect the BPMV and the EBCM from vehicle vibrations. The BPMV contains the following components: Pump Motor Inlet Valves (one per wheel) Outlet Valves (one per wheel) Master Cylinder Isolation Valves (one per drive wheel) Prime Valves (one per drive wheel)
3. Wheel Speed Sensors (WSS) - As the wheel spins, the wheel speed sensor produces an AC signal. The EBCM uses this AC signal to calculate wheel speed. The wheel speed sensors are replaceable only as part of the wheel hub and bearing assemblies.
4. Traction Control Switch - The TCS is manually disabled or enabled using the traction control switch.
5. Stoplamp Switch - The EBCM uses the stoplamp switch as an indication that the brake pedal is applied.
6. Lateral Accelerometer Sensor (w/JL4) - The EBCM uses the lateral accelerometer sensor as an indication of the lateral acceleration of the vehicle.
7. Yaw Rate Sensor (w/JL4) - The EBCM uses the yaw rate sensor as an indication of the yaw rate of the vehicle.
8. Steering Wheel Position Sensor (SWPS) (w/JL4) - The EBCM uses the SWPS as an indication of the position and rotation of the steering wheel.