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 LS 400FACTORY OEM SERVICE PROCEDURE
Multiplex Control System DTCS
MULTIPLEX CONTROL SYSTEM DTCS
| OEM Code | Description |
|---|---|
| 11 | Communication From Driver's Door ECU to Body ECU Is Cut Off |
| 12 | Communication From Front Passenger Door ECU to Body ECU Is Cut Off |
| 13 | Communication From Tilt/Telescopic ECU to Body ECU Is Cut Off |
| 14 | Communication Circuit Is Shorted To Battery Voltage |
| 15 | Communication Circuit Is Shorted To Ground |
| 21 | Power Window Master Switch Stays On, Or Is In Operation |
| 22 | Driver's Key Lock & Unlock Switch Stays On, Or Is In Operation |
| 22 | Driver's Memory Switch Stays On, Or Is In Operation |
| 22 | Shoulder Belt Adjust Switch Stays On, Or Is In Operation |
| 31 | Front Passenger Door Key Lock & Unlock Switch Stays On, Or Is In Operation |
| 31 | Front Passenger Door Lock Control Switch Stays On, Or Is In Operation |
| 41 | Luggage Compartment Door Key Switch Stays On, Or Is In Operation |
| 41 | Luggage Compartment Door Opener Switch Stays On, Or Is In Operation |
| 51 | Mirror Control Switch Stays On, Or Is In Operation |
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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