Lexus SC300 / Lexus SC400. Service manual - part 185

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Terminals

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Symbols

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Wiring

Color

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Condition

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Standard Value

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T9–19 

↔

 T9–16

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TSW 

↔

 E

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L 

↔

 W–B

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Luggage compartment door opener switch ON.

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1 

 or less

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Luggage compartment door opener switch
OFF.

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1 M

 or higher

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T9–20 

↔

 T9–16

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+B1 

↔

 E

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R 

↔

 W–B

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Always

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10–14 V

O 

When checking the voltage or resistance of theft deterrent and door lock ECU terminal, disconnect
the ECU connector.

BE–370

–

BODY ELECTRICAL SYSTEM

Door Lock Control System

MATRIX CHART OF PROBLEM SYMPTOMS

Perform troubleshooting of the circuits for the applicable problem symptom in the order given in the chart below.
Proceed to the page located for each circuit.
HINT:

If the instruction “Proceed to next circuit inspection shown on matrix chart” is given in the flow chart for each
circuit, proceed to the circuit with the next highest number in the table to continue the check.

If the trouble still reappears even though there are no abnormalities in any of the other circuits, then check
or replace the Theft Deterrent and Door Lock ECU as the last step.

See page

BE–376

BE–378

BE–380

BE–382

BE–384

BE–386

BE–388

BE–390

BE–392

IN–32

Symptom

Suspect Area

ECU Power Source Circuit

Actuator Power Source Circuit

Door Lock Motor Circuit

Luggage Compartment Door Opener Motor

Circuit

Door Lock Control Switch Circuit

Door key Lock and Unlock Switch Circuit

Key Unlock W

arning 

Switch 

Circuit

Luggage Compartment Door Opener Main

Switch and Opener Switch Circuit

Door Open Detection Switch Circuit

Theft Deterrent and Door Lock ECU

Whole functions of the door lock control system does not

Whole functions of the door lock control system does not

t

1

2

4

3

5

operate.

1

2

4

3

5

All doors or some doors are not locked and unlocked with the

All doors or some doors are not locked and unlocked with the
Door Lock Control Switch and Key operated Switch

Door Lock Control Switch and Key operated Switch.
(Luggage compartment door opener function normally oper

3

1

2

4

(Luggage compartment door opener function normally oper-

t )

3

1

2

4

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-

1

2

3

4

(

y

y

erated switch.)

1

2

3

4

Doors are not locked or unlocked with the key operated

Doors are not locked or unlocked with the key o erated
switch. (Doors lock and unlock normally with the door lock

1

2

(

y

control switch.)

1

2

Key confinement prevention function does not operate

Key confinement prevention function does not operate.

1

2

3

y

Doors lock and unlock normally with the key operated switch

1

2

3

Doors 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-

t

2

1

3

ate.

2

1

3

–

BODY ELECTRICAL SYSTEM

Door Lock Control System

BE–371

Location of Connectors

Location of Connectors in Engine Compartment

BE–372

–

BODY ELECTRICAL SYSTEM

Door Lock Control System

Location of Connectors in Body

–

BODY ELECTRICAL SYSTEM

Door Lock Control System

BE–373