Lexus SC300 / Lexus SC400. Service manual — part 195

STANDARD VALUE OF ECU TERMINAL

ÑÑÑÑÑÑ

Terminals

ÑÑÑÑÑÑ

Symbols

ÑÑÑÑÑÑ

Wiring

color

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Condition

ÑÑÑÑÑÑ

Standard

Value

ÑÑÑÑÑÑ

W8–1

↔

W8–7

ÑÑÑÑÑÑ

+B1

↔

ÑÑÑÑÑÑ

R–L

↔

W–B

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Wireless door lock main switch ON

ÑÑÑÑÑÑ

10 ~ 14 V

ÑÑÑÑÑÑ

W8–1

↔

W8–7

ÑÑÑÑÑÑ

+B1

↔

ÑÑÑÑÑÑ

R–L

↔

W–B

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Wireless door lock main switch OFF

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

W8–2

↔

Body

ÑÑÑÑÑÑ

LSWD1

↔

Body

ÑÑÑÑÑÑ

L–W

↔

Body

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door lock knob of driver’s door LOCK

ÑÑÑÑÑÑ

8 ~ 10 V

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door lock knob of driver’s door UNLOCK

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

W8–3

↔

Body

ÑÑÑÑÑÑ

LSWP

↔

Body

ÑÑÑÑÑÑ

P–B

↔

Body

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door lock knob of assistant’s door LOCK

ÑÑÑÑÑÑ

8 ~ 10 V

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door lock knob of assistant’s door UNLOCK

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

W8 4

↔

Body

ÑÑÑÑÑÑ

UL1

↔

Body

ÑÑÑÑÑÑ

G W

↔

Body

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Turn ignition switch ON,
Key operate switch Left and Right UNLOCK

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

W8–4

↔

Body

Ground

ÑÑÑÑÑÑ

UL1

↔

Body

Ground

ÑÑÑÑÑÑ

G–W

↔

Body

Ground

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Turn ignition switch ON
Key operate switch Left or Right UNLOCK

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Except above mention

ÑÑÑÑÑÑ

8 ~ 10 V

ÑÑÑÑÑÑ

W8–5

↔

Body

ÑÑÑÑÑÑ

↔

Body

ÑÑÑÑÑÑ

G–Y

↔

Body

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Turn ignition switch, ON
Key operate switch Right LOCK

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Turn ignition switch ON,
Except above mention

ÑÑÑÑÑÑ

8 ~ 10 V

ÑÑÑÑÑÑ

W8–6

↔

Body

ÑÑÑÑÑÑ

KSW

↔

Body

ÑÑÑÑÑÑ

↔

Body

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Ignition key insert key cylinder

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Ignition key pull out key cylinder

ÑÑÑÑÑÑ

10 ~ 14 V

ÑÑÑÑÑÑ

W8–7

↔

Body

Ground

ÑÑÑÑÑÑ

↔

Body

Ground

ÑÑÑÑÑÑ

W–B

↔

Body

Ground

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Always

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

W8–9

↔

Body

ÑÑÑÑÑÑ

LSWD2

↔

Body

ÑÑÑÑÑÑ

W–L

↔

Body

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door lock knob of driver’s door LOCK

ÑÑÑÑÑÑ

8 ~ 10 V

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door lock knob of driver’s door UNLOCK

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door open detection switch Left and Right ON

ÑÑÑÑÑÑ

W8–10

↔

Body

ÑÑÑÑÑÑ

DSWD

↔

Body

ÑÑÑÑÑÑ

G–L

↔

Body

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door open detection switch Left or Right ON

ÑÑÑÑÑÑ

Below 1 V

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑ

Ground

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door open detection switch Left or Right OFF

ÑÑÑÑÑÑ

ÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑÑ

Door open detection switch Left and Right OFF

ÑÑÑÑÑÑ

10 ~ 14 V

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

BE–453

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:

•

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.

•

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
and replace the Wireless Door Lock ECU as the last step.

See page

BE–460

BE–462

BE–464

BE–466

BE–468

BE–470

IN–32

Symptom

Suspect

Area

ECU Power Source Circuit

Door Unlock Detection Switch Circuit

Door Key Lock and Unlock Swtich Circuit

(Unlock Side)

Door Key Lock and Unlock Swtich Circuit

(Lock Side)

Key Unlock W

arning

Switch

Circuit

Door Open Detection Swtich Circuit

Wireless Door Lock ECU

All functions of wireless door lock control system do not
operate.

Only door unlock operation is not possible
(Lock operation is possible).

Only door lock operation is not possible
(Unlock operation is possible).

Only transmitter misoperation prevention function is not
possible

Wireless door lock function operates even when each door is
opened.

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

BE–454

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

–MEMO–

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

BE–455

LOCATION OF CONNECTORS

Location of Connectors in Engine Compartment

BE–456

–

BODY ELECTRICAL SYSTEM

Wireless Door Lock Control System

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Lexus SC300 / Lexus SC400. Service manual — part 195

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