1992 Lexus LS 400FACTORY OEM SERVICE PROCEDURE

Control Units

CONTROL UNITS LOCATION

Component Location
Electronic Control Unit (ECU)
ABS
View of Dash Behind right side of dash. See Figure.
Control Units & Sensor Location Behind right side of dash. See Figure.
A/C System
View of Dash Behind center of console, integral of A/C control assembly. See Figure.
Control Units & Sensor Location Behind center of console, integral of A/C control assembly. See Figure.
Anti-Theft
View of Dash Behind left side of dash, above fuse/relay block. See Figure.
Control Units & Sensor Location Behind left side of dash, above fuse/relay block. See Figure.
Coolant Level Warning Behind left side of dash, left of steering column. See Figure.
Cruise Control
View of Dash Behind left side of dash. See Figure.
Control Units & Sensor Location Behind left side of dash. See Figure.
Electric Side Mirrors
View of Dash Behind right side of dash. See Figure.
Control Units & Sensor Location Behind right side of dash. See Figure.
Elec. Modulated Air Suspension In right rear corner of luggage compartment. See Figure.
Engine
View of Dash Behind right side of dash. See Figure.
Electrical Harness Layout Behind right side of dash. See Figure.
Control Units & Sensor Location Behind right side of dash. See Figure.
Power Door Lock
View of Dash Behind left side of dash, integral of anti-theft ECU. See Figure.
Control Units & Sensor Location Behind left side of dash, integral of anti-theft ECU. See Figure.
Electronic Control Unit (ECU)
Power Seat Under driver's seat. See Figure.
Progressive Power Steering
View of Dash Behind center of dash. See Figure.
Control Units & Sensor Location Behind center of dash. See Figure.
Shift Lock
View of Dash Under center console, on base of gear selector. See Figure.
Control Units & Sensor Location Under center console, on base of gear selector. See Figure.
Tilt & Telescopic Steering Column
View of Dash Behind left side of dash, above steering column. See Figure.
Control Units & Sensor Location Behind left side of dash, above steering column. See Figure.
TRAC System
View of Dash Behind right side of dash, integral of ABS ECU. See Figure.
Control Units & Sensor Location Behind right side of dash, integral of ABS ECU. See Figure.
Transmission
View of Dash Behind right side of dash, integral of engine ECU. See Figure.
Electrical Harness Layout Behind right side of dash, integral of engine ECU. See Figure.
Control Units & Sensor Location Behind right side of dash, integral of engine ECU. See Figure.
Wireless Door Lock In left side of luggage compartment.
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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