1991 LEXUS SC400 Service Repair Manual

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Page 737 of 4087

LEXUS SC400 1991 Service Repair Manual

Terminals Symbols WiringColor Condition Standard Value
T9±19 e T9±16 TSW e E L

Page 738 of 4087

$LEXUS SC400 1991 Service Repair Manual MATRIX CHART OF PROBLEM SYMPTOMS Perform troubleshooting of the circuits for the applicable problem symptom in t\ he order given in the chart below. Proceed to the page located for each circuit. HIN$

MATRIX CHART OF PROBLEM SYMPTOMS
Perform troubleshooting of the circuits for the applicable problem symptom in t\
he order given in the chart below.
Proceed to the page located for each circuit.
HINT: If the instruction ªProceed to next circuit inspection shown on matrix \
chartº is given in the flow chart for each
circuit, proceed to the circuit with the next highest number in the table to con\
tinue the check.
If the trouble still reappears even though there are no abnormalities in a\
ny of the other circuits, then check
or replace the Theft Deterrent and Door Lock ECU as the last step.
See page
BE±376BE±378BE±380BE±382BE±384BE±386BE±388BE±390BE±392IN±32
SymptomSuspect Area
ECU Power Source CircuitActuator Power Source CircuitDoor Lock Motor CircuitLuggage Compartment Door Opener Motor
CircuitDoor Lock Control Switch CircuitDoor key Lock and Unlock Switch CircuitKey Unlock Warning Switch CircuitLuggage Compartment Door Opener Main
Switch and Opener Switch CircuitDoor Open Detection Switch CircuitTheft Deterrent and Door Lock ECU
Whole functions of the door lock control system does notWhole functions of the door lock control system does not
t12435operate.12435
All doors or some doors are not locked and unlocked with theAll doors or some doors are not locked and unlocked with the
Door Lock Control Switch and Key o
perated SwitchDoor Lock Control Switch and Key operated Switch.
(Luggage compartment door opener function normally oper3124(Luggage compartment door opener function normally oper-
t)
3124
ate.)
Doors cannot be locked or unlocked with the door lock con-Doors cannot be locked or unlocked with the door lock con
trol switch. (Doors lock and unlock normally with the key op-1234(yy
erated switch.)
1234
Doors are not locked or unlocked with the key operatedDoors are not locked or unlocked with the key o erated
switch. (Doors lock and unlock normally with the door lock12(y
control switch.)
12
Key confinementprevention function does not operateKey confinement prevention function does not operate.123y
Doors lock and unlock normally with the key o
perated switch123Doors lock and unlock normally with the key operated switch.
Luggage compartment door opener function does not oper-Luggage compartment door opener function does not oper-
t213ate.213
±
BODY ELECTRICAL SYSTEM Door Lock Control SystemBE±371
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Page 739 of 4087

LEXUS SC400 1991 Service Repair Manual
Location of Connectors
Location of Connectors in Engine Compartment
BE±372±
BODY ELECTRICAL SYSTEM Door Lock Control System
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Page 740 of 4087

LEXUS SC400 1991 Service Repair Manual
Location of Connectors in Body
±
BODY ELECTRICAL SYSTEM Door Lock Control SystemBE±373
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Page 741 of 4087

LEXUS SC400 1991 Service Repair Manual
Location of Connectors in Instrument Panel
BE±374±
BODY ELECTRICAL SYSTEM Door Lock Control System
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Page 742 of 4087

LEXUS SC400 1991 Service Repair Manual
±
BODY ELECTRICAL SYSTEM Door Lock Control SystemBE±375
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Page 743 of 4087

LEXUS SC400 1991 Service Repair Manual
Check DOME fuse.NG OKCheck for short in all the harness
and components connected to the
DOME fuse (See attached wiring
diagram).1
Check and repair harness and connector
between ECU and battery. Proce

Page 744 of 4087

LEXUS SC400 1991 Service Repair Manual
OKNG
NGOK
OKNG
INSPECTION PROCEDURE
1Check DOME fuse.
C
OK
PRemove DOME fuse from R/B No. 2.
Check continuity of DOME fuse.
Continuity
Check for short in all the harness and components con-
nected to

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