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.
2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE
Service Data
BRAKE CONTROL AND DYNAMIC CONTROL SYSTEMS - SERVICE DATA
| VSC off switch | Resistance 3-4 | Pressed | Below 1 Ω |
| Not pressed | 10 kΩ or higher | ||
| Brake pedal load sensing switch | Resistance 1-2 | Brake pedal load sensing switch OFF (Brake pedal depressed) | 950 to 1050 Ω |
| Brake pedal load sensing switch ON (Brake pedal released) | 203 to 223 Ω | ||
| ABS motor relay (ABS MOTOR1 (fail safe)) | Resistance 3-5 | Battery voltage is not applied between terminals 1 and 2 | 10 kΩ or higher |
| Battery voltage is applied between terminals 1 and 2 | Below 1 Ω | ||
| ABS motor relay (ABS MOTOR3) | Resistance 3-5 | Battery voltage is not applied between terminals 1 and 2 | 10 kΩ or higher |
| Battery voltage is applied between terminals 1 and 2 | Below 1 Ω | ||
| Stop light control relay (BRK-LP) | Resistance 3-4 | Battery voltage is not applied between terminals 1 and 2 | Below 1 Ω |
| Battery voltage is applied between terminals 1 and 2 | 10 kΩ or higher | ||
| Resistance 3-5 | Battery voltage is not applied between terminals 1 and 2 | 10 kΩ or higher | |
| Battery voltage is applied between terminals 1 and 2 | Below 1 Ω | ||
| ABS solenoid relay (ABS SOL) | Resistance 3-5 | Battery voltage is not applied between terminals 1 and 2 | 10 kΩ or higher |
| Battery voltage is applied between terminals 1 and 2 | Below 1 Ω |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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