1991 LEXUS SC300 Service Repair Manual

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Page 689 of 4087

LEXUS SC300 1991 Service Repair Manual
WIRING DIAGRAM
Check harness and connector between
ECU and tilt & telescopic ECU (See page
IN±27). NG
NG
OK
OK
Check return operation of tilt and
telescopic ECU, and mirror ECU. Repair or replace ha

Page 690 of 4087

$LEXUS SC300 1991 Service Repair Manual OKNG OKNG INSPECTION PROCEDURE 1Check for open and short in harness and connector between ECU and tilt & telescopi\ c ECU (See page IN±27 ). HintDepending on the differences that exist for retur$

Page 691 of 4087

LEXUS SC300 1991 Service Repair Manual
POWER SEAT CONTROL SYSTEM
(Passenger s seat)
±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passengers Seat)BE±309
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Page 692 of 4087

$LEXUS SC300 1991 Service Repair Manual DESCRIPTION In walk±in operation, when the passengers seat back is reclined fully forward, this is detected by the limit swit\ ch and the seat slides forward electronically. In return operation, wh$

Page 693 of 4087

$LEXUS SC300 1991 Service Repair Manual Parts Name\ \ Function Passengers Seat ECU\ $

Parts Name\
\
Function

Passenger's Seat
ECU\

\

\

The passenger seat ECU controls the distance the seat slides when the po\
wer seat switch is
operated and also controls the power slide distance during return operat\
ion.

Power Seat Switch\

\

\

When the power seat switch is operated, a seat slide signal is sent to t\
he ECU. The reclining
slide of the switch is linked directly to the motor operation.

Slide Position Sensor\

\

\

The slide position sensor detects the slide distance during walk±in o\
peration and
inputs the information to the ECU.

Slide Neutral Limit
Switch\

\

\

This switch detects the neutral position of the seat slide and input the\
information to the ECU.

Reclining Front Limit
Switch\

\

\

This switch detects when the seatback is inclined fully forward and info\
rms the
ECU.

Reclining Rear Limit
Switch\

\

\

This switch detects when the seatback is pulled back and informs the ECU\
.
Motor\
\
There are two motors, one each for seat sliding and for reclining.

Tension Reducer and
Buckle Switch\

\

\

This switch inputs a signal to the ECU to inform it whether the tongue o\
f the
passenger's seat belt is inserted in the buckle.
±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passenger's Seat)BE±311
WhereEverybodyKnowsYourName

Page 694 of 4087

LEXUS SC300 1991 Service Repair Manual
PARTS LOCATION
BE±312±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passengers Seat)
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Page 695 of 4087

$LEXUS SC300 1991 Service Repair Manual HOW TO PROCEED WITH TROUBLESHOOTING Perform troubleshooting in accordance with the procedure on the following page.\ CUSTOMER PROBLEM ANALYSIS Using the customer problem analysis check sheet for$

Page 696 of 4087

LEXUS SC300 1991 Service Repair Manual
BE±316
IN±20
BE±31 9
BE±32 4 BE±34
4
±
BODY ELECTRICAL SYSTEM Power Seat Control System (Passengers Seat)BE±315
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