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.
1994 Lexus ES 300FACTORY OEM SERVICE PROCEDURE
Speedometer System Test
- If tachometer and fuel gauge operate, go to next step. If tachometer and fuel gauge do not operate, disconnect connector "B" from back of instrument cluster. See Figure. Check for open circuit between ground and terminal No. 10. See Figure. If circuit is okay, replace instrument cluster computer. See Figure.
- If odometer and twin trip meter do not operate, go to next step. If odometer and twin trip meter operate, replace character plate. See Figure. If speedometer still does not operate, replace instrument cluster computer.
- Disconnect connector "B" from back of instrument cluster. See Figure. At instrument cluster connector "B", connect voltmeter positive lead to terminal No. 13 and negative lead to terminal No. 15. See Figure. Shift transmission into Neutral. Raise and support vehicle with one front wheel off of ground. Turn ignition on. Rotate front wheel.
- If voltage alternates between zero and 12 volts, replace instrument cluster computer. See Figure. If voltage does not alternate between zero and 12 volts, check VSS. See VEHICLE SPEED SENSOR (VSS) TEST under COMPONENT TESTING. If VSS is okay, repair circuit between VSS and instrument cluster.
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.
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