1991 LEXUS SC400 Service Repair Manual

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Page 761 of 4087

LEXUS SC400 1991 Service Repair Manual
±MEMO± BE±394
±
BODY ELECTRICAL SYSTEM Door Lock Control System
WhereEverybodyKnowsYourName

Page 762 of 4087

LEXUS SC400 1991 Service Repair Manual
WIRELESS DOOR LOCK CONTROL
SYSTEM
±
BODY ELECTRICAL SYSTEM Wireless Door Lock Control SystemBE±439
WhereEverybodyKnowsYourName

Page 763 of 4087

$LEXUS SC400 1991 Service Repair Manual DESCRIPTION The wireless door lock control system is to lock and unlock all the doors a\ t a distance, transmitting a weak radio wave from a transmitter contained in the master ignition key. The weak$

Page 764 of 4087

$LEXUS SC400 1991 Service Repair Manual DESCRIPTION The wireless door lock control system is to lock and unlock all the door\ s at a distance, transmitting a weak radio wave from a transmitter contained in the master ignition key. The weak$

Page 765 of 4087

LEXUS SC400 1991 Service Repair Manual
±MEMO±
±
BODY ELECTRICAL SYSTEM Wireless Door Lock Control SystemBE±441
WhereEverybodyKnowsYourName

Page 766 of 4087

$LEXUS SC400 1991 Service Repair Manual HOW TO PROCEED WITH TROUBLESHOOTING HINT: Troubleshooting of the wireless door lock control system is based on the \ premise that the door lock control system is operating normally. Accordingly, befo$

HOW TO PROCEED WITH TROUBLESHOOTING
HINT: Troubleshooting of the wireless door lock control system is based on the \
premise that the door lock control
system is operating normally. Accordingly, before troubleshooting the wireless door lock control system, first
make certain that the door lock control system is operating normally.
Perform troubleshooting in accordance with the procedure on the followin\
g page.
CUSTOMER PROBLEM ANALYSIS
Using the customer problem analysis check sheet of reference, ask the custome\
r in as much detail as pos-
sible 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 ªProblem Simulation Methodº.
At this stage check whether the whole wireless door lock control system fa\
ils to operate, or whether only
some of the particular functions fail to operate.
PRECHECK TYPE I, PRECHECK TYPE II
Using the self diagnosis function of the wireless door lock ECU, perform Prec\
heck Type I to find out if the
system is normal (system non±operation due to external noise, etc.)\
or if the abnormality lies with the ve-
hicle. In Precheck Type II, locate if the cause of problem lies in the transmitter, the antenna or the vehicle.
Perform Precheck Type I when whole wireless door lock control system fails to operate only\
at a specific
locality.
Perform Precheck Type II when whole wireless door lock control system fails to operate no matter where
the locality is.
When only some functions of wireless door lock control system do not operate\
, proceed to [8] on the Matrix
Chart of Problem Symptoms.
INSPECTION OF TRANSMITTER, [7] INSPECTION OF ANTENNA CIRCUIT
If it is found in Precheck Type II that the cause of the problem is in the transmitter or antenna, proc\
eed to
the appropriate pages and start troubleshooting.
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 [8]. Judge
whether the cause of the problem is in the sensor, wire harness and connectors, or the ECU.
[10] REPAIR If the cause of the problem is found in [9]., perform repairs.
[11] CONFIRMATION TEST After completing repairs, confirm that the problem is eliminated and that all functions of the wireless door
lock control system are normal.
BE±442
±
BODY ELECTRICAL SYSTEM Wireless Door Lock Control System
WhereEverybodyKnowsYourName

Page 767 of 4087

LEXUS SC400 1991 Service Repair Manual
Vehicle Brought to WorkshopCustomer Problem Analysis P.BE±444
Problem Symptom Confirmation
Matrix Chart of Problem Symptoms P.BE±454 P.
IN±20
Circuit Inspection
P. BE±460 ~ BE±470
Identificatio

Page 768 of 4087

$LEXUS SC400 1991 Service Repair Manual CUSTOMER PROBLEM ANALYSIS CHECK SHEET \ \ \ WIRELESS DOOR LOCK CONTROL System Check Sheet Inspect$

CUSTOMER PROBLEM ANALYSIS CHECK SHEET
\

\

\
WIRELESS 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

Weather
\

\

\

Fine Cloudy Rainy Snowy
Various/Others

Conditions at
Time of Problem
Occurrence

Outdoor Temperature
\

\

\

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

Place\

\

\

Everywhere Specific Locality ( )

Date Transmitter Battery Last Replaced\

\

\
//
\
\

Whole wireless door lock control system does not operate
\

Whole wireless door lock control system does not operate.

\

\

\

Only door unlock operation is not possible.
\
\
Only door lock operation is not possible.

\

\

\

Only key confine prevention function is not possible.
\
\
Wireless door lock function operates even when each door is opened.

\

\

\

\

Wireless door lock function incorrectly.
(Although one door is unlocked, when the transmitter
switch is pressed, all doors unlock.)

When RH door is unlocked.
When LH door is unlocked.

\

\

\

\

\

\

Others
Problem Symptom
BE±444±
BODY ELECTRICAL SYSTEM Wireless Door Lock Control System
WhereEverybodyKnowsYourName

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