1991 LEXUS SC400 wiring

SR±52).
IN±33).
WIRING DIAGRAM
Telescopic Position Sensor Circuit
CIRCUIT DESCRIPTION
The telescopic position is sent to the ECU as a voltage signal from the pos\
ition sensor.
A constant 5 V is supplied to terminal 6 of the sensor.
The voltage at terminal 5 varies with position and is input to the ECU.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
SR±76±
STEERING STEERING COLUMN
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SR±52 ).
IN±33 ).
WIRING DIAGRAM
Telescopic Motor Circuit
CIRCUIT DESCRIPTION
The ECU provides both + B and ground for the telescopic motor.
Reversing polarity of the applied voltage reverses the motor.
 Te M+ Te M± Rotation Telescopic
 

+ 

± 

Clockwise 

Contracted
 ± + Counterclockwise Extended
DIAGNOSTIC CHARTDIAGNOSTIC CHART
SR±78±
STEERING STEERING COLUMN
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SR±52).
IN±33 ).
WIRING DIAGRAM
Auto Set Switch Circuit
CIRCUIT DESCRIPTION
This is the main switch for auto operation.
When the switch is off, auto operation is prohibited.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
SR±80±
STEERING STEERING COLUMN
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Operation of the switch sends different voltage
signals to the ECU.
SR±52 ).
IN±33 ).
WIRING DIAGRAM
Manual Switch Circuit
CIRCUIT DESCRIPTION
DIAGNOSTIC CHARTDIAGNOSTIC CHART
SR±84±
STEERING STEERING COLUMN
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SR±52).
IN±33).
WIRING DIAGRAM
Set Switch Circuit
CIRCUIT DESCRIPTION
When switch 1 or 2 is pushed while SET switch is being pushed ON in memory o\
peration, a signal is sent
to the ECU to memorize the present positions of the tilt, telescopic, seat\
and mirror.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
SR±88±
STEERING STEERING COLUMN
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SR±52).
IN±33).
WIRING DIAGRAM
Memory & Return Switches Circuit
CIRCUIT DESCRIPTION
A memory command signal when switch 1 or 2 pushed while SET
switch is being pushed ON or a return command signal when
switch 1 or 2 is pushed ON is sent to the ECU for memory and re-
turn operations of the tilt, telescopic, seat and mirror.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
SR±90±
STEERING STEERING COLUMN
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SR±52).
WIRING DIAGRAM
Ignition Switch Circuit
CIRCUIT DESCRIPTION
The ON, OFF signal from the IG switch is sent to the ECU.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
SR±92±
STEERING STEERING COLUMN
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SR±52).
BE±168
.
WIRING DIAGRAM
Park/Neutral Position Switch Circuit
CIRCUIT DESCRIPTION
The park/neutral position switch detects whether the shift position is in P\
position or in another position,
and sends a signal to the ECU.
DIAGNOSTIC CHARTDIAGNOSTIC CHART
SR±94±
STEERING STEERING COLUMN
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