1991 LEXUS SC300 key

Troubleshooting
You will find the cause of trouble more easily by properly using the tabl\
e shown below. In this table, the numbers
indicate the order of priority of the causes of trouble. Check each part in the \
order shown. If necessary, replace
the part.
See page
BE±4,21BE±4,21BE±4,20BE±4,20BE±156BE±152BE±180BE±179BE±179 ±±BE±181BE±26BE±79BE±4,20 ±±
Part
name
Trouble
AM1 FuseDOME FuseDOOR FusePOWER FuseTheft Deterrent and Door Lock Control ECUPower Window Main RelaySliding Roof Control RelaySliding Roof SwitchSliding Roof MotorSliding Rood Motor (Stones to foreign material
trapped in motor assembly)Limit SwitchIgnition SwitchDoor Courtesy SwitchECU±IG FuseWire Harness
*1 Sliding roof system does not operate.1234
*2 Sliding roof system does not operate.35467892110
Sliding roof system operates abnormally.1324
Sliding roof system stops operation half way.1342
Buzzer does not sound.123
Buzzer sounds abnormally.1
ªKey±off Sliding Roofº operation does not
operate.124536
*1: Door Lock does not operate
*2: Door Lock is normal
BE±182
±
BODY ELECTRICAL SYSTEM Sliding Roof System
WhereEverybodyKnowsYourName

Parts Inspection
(Fuel Lid Opener Switch)
REMOVAL AND INSTALLATION OF FUEL
LID OPENER SWITCH
REMOVE AND INSTALL FUEL LID OPENER SWITCH(a) Remove No. 1 lower finish panel.
(See Instrument Panel on page BO±113)
(b) Remove the key cylinder, then remove the fuel lid opener
switch assembly from the pad.
(c) Install the opener switch assembly and key cylinder to
the pad.
(d) Install the No. 1 lower finish panel. (See Instrument Panel on page BO±116)
INSPECTION OF FUEL LID OPENER
SWITCH
INSPECT SWITCH CONTINUITY
(a) Check that there is continuity between terminals with the
switch ON (Lever pulled).
(b) Check that there is no continuity between terminals with
the switch OFF (Lever free).
If continuity is not as specified, replace the switch assembly.
(Fuel Lid Opener Solenoid)
REMOVAL AND INSTALLATION OF FUEL
LID OPENER SOLENOID
REMOVE AND INSTALL FUEL LID SOLENOID (a) Disconnect the connector from the solenoid.
(b) Open the fuel lid and remove the solenoid lock nut, thenremove the solenoid.
(c) Install the solenoid in place with the lock nut.
(d) Connect the connector to the solenoid.
INSPECTION OF FUEL LID OPENER
SOLENOID
INSPECT SOLENOID OPERATION (a) Apply battery voltage to the terminals.
(b) Check that the solenoid operates in the open direction.
If operation is not as specified, replace the solenoid.
BE±192
±
BODY ELECTRICAL SYSTEM Fuel Lid Opener System
WhereEverybodyKnowsYourName

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 reference, ask the c\
ustomer in as much detail as
possible about the problem.
\b PROBLEM SYMPTOM CONFIRMATION,  SYMPTOM SIMULATION.
Confirm the problem symptoms. If the problem does not reappear, be sure to simulate the problem using
the ºProblem Simulation Methodsº.
When checking the problem symptoms, pay attention to the following points to\
accurately define the symp-
toms and the extent of the problem:
For ºNot Functioningº problems:
(1) Is the problem only in one part (e.g. ºreclining onlyº), or ever\
ything?
(2) Is the problem only for manual operation, only for position return opera\
tion, or for both manual and position return operation?
(3) Is tilt, telescopic and outer mirror operation normal?
(4) Does the problem occur with the ignition key inserted, or not inserted?
 MATRIX CHART OF PROBLEM SYMPTOMS
Confirm the order of inspection on the matrix chart for the particular problem symptom involved. For ºNot
Functioningº problems, pay attention to the points in \b. to find out the specifics of the problem, then choose
the most appropriate problem symptom from among those listed on the matr\
ix chart, and proceed with trou-
bleshooting accordingly.
 CIRCUIT INSPECTION
Proceed with diagnosis of each circuit in accordance with the inspection\
order confirmed in .
Determine whether the cause of the problem is in the sensor, actuators, wire harness and connectors, or
the ECU.
 POSITION SENSOR CHECK
This function checks that the signal from each position sensor is correctly input into\
the ECU when the
manual switch is turned ON. The instructions for this diagnosis are included in\
the flow chart for the position
sensor circuit.
 REPAIR
After the cause of the problem is located, perform repairs by following the i\
nspection and replacement pro-
cedures is this manual.
 CONFIRMATION TEST
After completing repairs, confirm that the problem is eliminated and that tilt, telescopic and outer mirror
operation is normal.
BE±268
±
BODY ELECTRICAL SYSTEM Power Seat Control System (Driver's Seat)
WhereEverybodyKnowsYourName

CUSTOMER PROBLEM ANALYSIS CHECK SHEET
POWER SEAT Check Sheet
Inspector 's
Name :
 


 


 

Registration No.
 


 

Customer 's Name
 


 

Registration Year
 

//
 


 


 

Frame No.
 


 

Date Vehicle
Brought In 

//
 

Odometer Reading
 

Km
Miles
 

Condition of
Problem
 

Date Problem
Occurrence\
 

\
//
 



Problem
Occurrence 



How Often does
Problem Occur?
\
 





Continuous
Intermittent ( times a day)
 




 






Manual Function
does not operate
\
 



\



Slide
Front Vertical

Rear Vertical
Reclining
Lumbar Support
 








Symptoms
 










Return Function
does not operate\
 







\



Slide
Front Vertical

Rear Vertical
Reclining

Does not operate in any conditions

Only with key inserted

Only with key not inserted

Only with memory & return switch 1 or 2
 \
 \

Memory function does not operate. 


\
 
\

\


Position return function does not stop when brake pedal is depressed.
For ªReturn function does not operateº malfunctions, check the ret\
urn operation of the items below.
 


Ch k It
 

Tilt & Telescopic
\
 

\


OK
NG
 


Check Item 

Outer Mirror
\
 

\


OK
NG
BE±270±
BODY ELECTRICAL SYSTEM Power Seat Control System (Driver's Seat)
WhereEverybodyKnowsYourName

DESCRIPTION
The door lock control system has a key±interlocked door lock and unlock \
function and a key±confinement pre-
vention function. All doors can be locked and unlocked simultaneously by\
key operation at the front right or left
door (the key needs to be operated twice to unlock the doors at the driver's door). If the door lock operation is
performed when one of the doors is open and the ignition key inserted in\
the key cylinder, doors are unlocked
automatically to prevent the ignition key from being left inside the veh\
icle. The luggage compartment door can
be opened by electromagnetic opener.
For the function of component parts of this system, refer to the circuit\
description in circuit inspection.
PARTS LOCATION
BE±362±
BODY ELECTRICAL SYSTEM Door Lock Control System
WhereEverybodyKnowsYourName

DESCRIPTION
The door lock control system has a key±interlocked door lock and unlock f\
unction and a key±confinement pre-
vention function. All doors can be locked and unlocked simultaneously by\
key operation at the front right or left
door (the key needs to be operated twice to unlock the doors at the driver's door). If the door lock operation is
performed when one of the doors is open and the ignition key inserted in\
the key cylinder, doors are unlocked
automatically to prevent the ignition key from being left inside the veh\
icle. The luggage compartment door can
be opened by electromagnetic opener.
For the function of component parts of this system, refer to the circuit\
description in circuit inspection.
PARTS LOCATION
BE±362±
BODY ELECTRICAL SYSTEM Door Lock Control System
WhereEverybodyKnowsYourName

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 reference, ask the c\
ustomer in as much detail as
possible about the problem.
 PROBLEM SYMPTOM CONFIRMATION,  SYMPTOM SIMULATION
Confirm the problem symptoms. If the problem does not reappear, be sure to simulate the problem using
ºProblem Simulation Methodº.
For example, if the malfunction involves failure of the lock or unlock duri\
ng operation of the Door Lock Con-
trol Switch, check if lock and unlock operation of the door using the key is\
normal or abnormal, and also
check if key confinement prevention function and luggage compartment door ope\
ner function are normal
or not. And having fully checked the extent of the malfunction.
 MATRIX CHART OF PROBLEM SYMPTOMS
Confirm the order of inspection for each applicable problem symptom on t\
he matrix chart.
 CIRCUIT INSPECTION
Proceed with diagnosis of each circuit in accordance with the inspection order \
confirmed in . Judge
whether the cause of the problem is in the sensor, wire harness and connectors, or the ECU.
 REPAIR
When the cause of the problem is found in , perform repairs.
 CONFIRMATION TEST
After completing repairs, confirm that the problem is eliminated and that all functions of the door lock control
system are normal.
BE±364
±
BODY ELECTRICAL SYSTEM Door Lock Control System
WhereEverybodyKnowsYourName

CUSTOMER PROBLEM ANALYSIS CHECK SHEET
\
 
\

\
DOOR LOCK CONTROL System Check Sheet
Inspector 's
Name :
   Registration No. 
 

Customer 's Name
 


 

Registration Year
 

//
 


 


 

Frame No.
 


 


Date Vehicle
Brought In 

//
 

Odometer Reading
 


km
Miles
 Date of Problem Occurrence\
 \
// 



Frequency of Problem Occurrence
\
 
\


\

\


Constant  Sometimes ( times/per day, month)
 Once only
 

Conditions at
Ti f P bl
 

Weather
\
 
\

\

Fine  Cloudy Rainy  Snowy
 Various/Others
 



Time of Problem
Occurrence 



Outdoor
Temperature
\
 
\


\


Hot  Warm  Cool
 Cold (Approx. 5F ( 5C))
 






 







Malfunction in Door Lock/Unlock
Operation Using Door Lock
Control Switch
 







Driver's side door lock
control switch
 







Driver's side door
 Passenger's side door
 






 






 







Passenger's side door lock
control switch
 







Driver's side door
 Passenger's door
 






 







Malfunction in Door Lock/Unlock
Operation Using Key.
 







Driver's side door key
operated switch
 







Driver's side door
 Passenger's side door
 




 




 





Passenger's side door key
operated switch
 





Driver's side door
 Passenger's side door
 




 




\
 
\


\

\


2±operation unlock function of driver's side door key operated
switch.
 \
 \
 Malfunction in Key Confinement Prevention Function.
 \
 \
 Malfunction in Luggage Compartment Door Opener Function.
 


\
 
\

\


Others
Problem Symptom
BE±366±
BODY ELECTRICAL SYSTEM Door Lock Control System
WhereEverybodyKnowsYourName