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.
1998 Lexus LX 470FACTORY OEM SERVICE PROCEDURE
Keyless Entry System
- Description & Operation
- Transmitter Programming
- System Tests
- Trouble Shooting
- Notes
- Trouble Shooting Symptoms
- All Functions Of Keyless Entry Do Not Work
- Door Unlock Operation Is Not Possible (Lock Possible)
- Door Lock Operation Is Not Possible (Unlock Possible)
- Only Transmitter Misoperation Prevention Function Is Not Possible
- Wireless Door Lock Function Operates Even When Each Door Is Opened
- Wireless Door Lock Functions Incorrectly (Although One Door Is Unlocked, When The Transmitter Switch Is Pressed, All Doors Unlock)
- Wireless Door Lock Operates But Taillight Does Not Respond
- Component Tests
- Circuit Tests
- Notes
- Test 1: Ecu Power Source Circuit
- Test 2: Ignition Switch Circuit
- Test 3: Door Unlock Detection Switch Circuit
- Test 4: Door Key Lock & Unlock Switch Circuit (Unlock Side)
- Test 5: Door Key Lock & Unlock Switch Circuit (Lock Side)
- Test 6: Key Unlock Warning Switch Circuit
- Test 7: Door Courtesy Switch Circuit
- Test 8: Taillight Relay Circuit
- Pin Voltage Tests
- Removal & Installation
- Wiring Diagrams
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.