Lexus ES300 (1997 year). Manual — part 396

H00003

ON

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–361

513

1997 LEXUS ES300 (RM511U)

3

Does SRS warning light turn off?

PREPARATION:
(a)

Turn ignition switch to LOCK.

(b)

Connect steering wheel pad connector.

(c)

Connect front passenger airbag assembly connector.

(d)

Connect airbag sensor assembly connector.

(e)

Turn ignition switch ON.

CHECK:
Operate electric system (defogger, wiper, headlight, heater
blower, etc.) and check that SRS warning light goes off.

NO

Check for DTCs. If a DTC is output, perform trou-
bleshooting for the DTC. If a normal code is out-
put, replace airbag sensor assembly.

YES

From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check.

W04366

Battery

ECU–

B

8

16

2

3

SRS Warning
Light

A

A

A

LA

ED

BR

Airbag
Sensor
Assembly

DLC1

E1

AB

LG

W–B

J1 Junction
Connector

7

Instrument
Panel J/B

Engine
Room J/B

1G

1W

2J

2A

Fusible Link
Block

FL MAIN
3.0 W

W–R

B

B–G

5

7

1

S

hor

t

pin

F6

1G2

IK3

F8

9

2

B–Y

B–Y

B–Y

5

LG

1

1

E1

BR

3

A

A

W–B

1J

1N

1

II

A

A

J15
Junction
Connector

J24
Junction
Connector

Instrument
Panel J/B

10A

7

W–R

DI–362

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

514

1997 LEXUS ES300 (RM511U)

SRS Warning Light Circuit Malfunction (Always lights up, when
ignition switch is in LOCK position.)

CIRCUIT DESCRIPTION

The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from the LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality.
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.

WIRING DIAGRAM

DI0B8–01

H00094

Airbag Sensor
Assembly

Spiral
Cable

P squib

D squib

LOCK

AB0117

W02765

H00044

Airbag Sensor Assembly

LOCK

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–363

515

1997 LEXUS ES300 (RM511U)

INSPECTION PROCEDURE

1

Preparation.

PREPARATION:
(a)

Disconnect negative (–) terminal cable from the battery,
and wait at least 90 seconds.

(b)

Remove steering wheel pad
(See page

SR–11

).

(c)

Disconnet connector of front passenger airbag assembly
(See page

RS–22

).

CAUTION:
Store the steering wheel pad with the front surface facing
upward.

2

Does SRS warning light turn off?

PREPARATION:
(a)

Turn ignition switch to LOCK.

(b)

Disconnect negative (–) terminal cable from the battery,
and wait at least 90 seconds.

(c)

Disconnect airbag sensor assembly connector.

(d)

Connect negative (–) terminal cable to battery.

CHECK:
Check operation of SRS warning light.

NO

Check SRS warning light circuit or terminal AB
circuit of DLC1.

YES

Replace airbag sensor assembly.

W04366

Battery

ECU–

B

8

16

2

3

SRS Warning
Light

A

A

A

LA

ED

BR

Airbag
Sensor
Assembly

DLC1

E1

AB

LG

W–B

J1 Junction
Connector

7

Instrument
Panel J/B

Engine
Room J/B

1G

1W

2J

2A

Fusible Link
Block

FL MAIN
3.0 W

W–R

B

B–G

5

7

1

S

hor

t

pin

F6

1G2

IK3

F8

9

2

B–Y

B–Y

B–Y

5

LG

1

1

E1

BR

3

A

A

W–B

1J

1N

1

II

A

A

J15
Junction
Connector

J24
Junction
Connector

Instrument
Panel J/B

10A

7

W–R

DI–364

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

516

1997 LEXUS ES300 (RM511U)

SRS Warning Light Circuit Malfunction (Does not light up, when
ignition switch is turned to ACC or ON.)

CIRCUIT DESCRIPTION

The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light lights up for approx. 6 seconds after the ignition switch is
turned from LOCK position to ACC or ON position, and then turns off automatically.
If there is a malfunction in the SRS, the SRS warning light lights up to inform the driver of the abnormality
When terminals Tc and E1 of the DLC1 are connected, the DTC is displayed by the blinking of the SRS warn-
ing light.

WIRING DIAGRAM

DI0B9–01