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.
Relay Operation
The ABS system has 2 relays, solenoid valve relay and pump motor relay. Both relays are mounted on top of hydraulic modulator. Current is supplied to both relays from battery through fuse panel. The ECU supplies a ground for relays when vehicle is running. This supplies a voltage signal from solenoid valve relay to front-control solenoids and to rear-control solenoid. Based upon speed sensor signals, ECU controls solenoid operation by supplying a ground to energize individual solenoids.
Pump motor relay closes when ground is provided through control unit. Pressure relieved by solenoid valve operation is returned to master cylinder by return pump motor.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.