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.
1997 Lexus ES 300FACTORY OEM SERVICE PROCEDURE
Test 14: Brake Warning Light Problem
- Check GAUGE fuse. Replace as needed. Disconnect connector "D". Turn ignition on. Check voltage at connector "D" terminal No. 3. If voltage does not exist, repair open circuit between GAUGE fuse and connector "D" terminal No. 3. Reconnect connector "D". Disconnect connector "A". Ground connector "A" terminal No. 9. Turn ignition on. If brake warning light illuminates, go to next step. If brake warning light does not illuminate, check light bulb. Replace as needed. If bulb is okay, install a known good circuit plate and retest. If light still does not illuminate, replace instrument panel computer and retest.
- Check brake warning light. See WARNING LIGHTS under COMPONENT TESTS. If brake warning light is okay, check brake warning switch operation. If brake warning light operation is not okay, repair wiring between connector "B" terminal No. 3 and sending unit terminal No. 1.
Factory Service Tools
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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.