Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
ABS Description and Operation: Notes
| Callout | Component Name |
|---|---|
| 1 | Electronic Brake Control Module (EBCM) |
| 2 | Brake Pressure Modulator Valve (BPMV) |
| Callout | Component Name |
|---|---|
| 1 | Master Cylinder Reservoir |
| 2 | Master Cylinder |
| 3 | Pump |
| 4 | Brake Pressure Modulator Valve (BPMV) |
| 5 | Damper |
| 6 | Right Rear Inlet Valve |
| 7 | Accumulator |
| 8 | Right Rear Brake |
| 9 | Right Rear Outlet Valve |
| 10 | Left Front Outlet Valve |
| 11 | Left Front Brake |
| 12 | Left Front Inlet Valve |
| 13 | Left Rear Inlet Valve |
| 14 | Left Rear Brake |
| 15 | Left Rear Outlet Valve |
| 16 | Right Front Outlet Valve |
| 17 | Right Front Brake |
| 18 | Accumulator |
| 19 | Right Front Inlet Valve |
| 20 | Damper |
This vehicle is equipped with the DBC7 antilock braking system.
The vehicle is equipped with the following braking systems:
- Antilock Brake System (ABS)
- Traction Control System (TCS) (w/NW7)
The following components are involved in the operation of the above systems:
- 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.
- 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.
The BPMV contains the following components:
- Pump Motor
- Inlet Valves (one per wheel)
- Outlet Valves (one per wheel)
- 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.
- Traction Control Switch (w/NW7) - The TCS is manually disabled or enabled using the traction control switch.
- Stoplamp Switch - The EBCM uses the stoplamp switch as an indication that the brake pedal is applied.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.