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.
2003 Lexus GS 430FACTORY OEM SERVICE PROCEDURE
With Hand-Held Tester
- Connect LEXUS hand-held tester to (DLC3). See Figure.
- Start engine and check that ABS warning light flashes. If ABS warning light does not flash, inspect ABS warning light circuit and Ts circuit. See TEST B: ABS WARNING LIGHT CIRCUIT and TEST H: TS TERMINAL CIRCUIT .
- If the ABS warning light flashes, leave vehicle condition and brake pedal in free condition for one second or more. Depress brake pedal for one second or more with at least 22 ft.lbs. (98 N.m) of force.
- Leaving vehicle in stationary condition, depress brake pedal quickly with 221 ft.lbs. (980 N.m) of force. At this time the ABS warning light comes on for 3 seconds.
- Drive vehicle straight forward at speeds of 28 mph or more for several seconds. Check that ABS warning light turns off.
- Stop vehicle. Read the DTC by following prompts on tester screen. Refer to the hand-held tester operator's manual for further details. If any DTCs are retrieved, perform appropriate test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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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