Lexus ES300 (1997 year). Manual — part 392

R05869

AB0118

R13006

AB0119

FI1390

H00042

Airbag Sensor
Assembly

Spiral
Cable

P Squib

D Squib

ACC

ON

or

DLC1

E1

Tc

Code 13

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–345

497

1997 LEXUS ES300 (RM511U)

NG

Replace airbag sensor assembly.

OK

4

Check D squib.

PREPARATION:
(a)

Turn ignition switch to LOCK.

(b)

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

(c)

Connect steering wheel pad connector.

(d)

Connect negative (–) terminal cable to battery,and wait at
least 2 seconds.

CHECK:
(a)

Turn ignition swiitch to LOCK, and wait at least 20 se-
conds.

(b)

Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.

(c)

Clear malfunction code stored in memory
(See page

DI–324

).

(d)

Turn ignition switch to LOCK, and wait at least 20 se-
conds.

(e)

Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.

(f)

Using SST, connect terminals Tc and E1 of DLC 1.
SST 09843–18020

(g)

Check DTC.

OK:

DTC 13 is not output.

HINT:
Codes other than code 13 may be output at this time, but they
are not relevant to this check.

NG

Replace steering wheel pad.

OK

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.

R05899

R14286

H00019

P Squib

D+

D–

(+)

(–)

Airbag Sensor
Assembly

Spiral
Cable

D Squib

R05904

R14286

H00043

Airbag Sensor
Assembly

Spiral
Cable

P Squib

D Squib

D+

D–

(+)

(–)

DI–346

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

498

1997 LEXUS ES300 (RM511U)

5

Check spiral cable.

PREPARATION:
(a)

Disconnect connector between airbag sensor assembly
and spiral cable.

(b)

Release airbag activation prevention mechanism on air-
bag sensor assembly side of airbag squib connector
(See page

DI–324

).

CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D+ and D–.
OK:OK:

Resistance: 1 M

Ω

or Higher

NG

Repair or replace spiral cable.

OK

6

Check harness between airbag sensor assembly and spiral cable.

PREPARATION:
Release airbag activation prevention mechanism on airbag
sensor assembly side of airbag squib connector
(See page

DI–324

).

CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the airbag sensor assembly and spiral cable, measure
the resistance between D+ and D–.
OK:

Resistance: 1 M

Ω

or Higher

NG

Repair or replace harness or connector be-
tween airbag sensor assembly and spiral cable.

OK

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.

R15194

Airbag Sensor
Assembly

Spiral
Cable

D Squib

1

2

D+

D–

Y–B

Y

6

7

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–347

499

1997 LEXUS ES300 (RM511U)

DTC

14

Open in D Squib Circuit

CIRCUIT DESCRIPTION

The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each components, see OPERATION on page

RS–2

.

DTC 14 is recorded when an open is detected in the D squib circuit.

DTC No.

DTC Detecting Condition

Trouble Area

14

Open circuit in D+ wire harness or D– wire harness of

squib

D squib malfunction

Spiral cable malfunction

Airbag sensor assembly malfunction

Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness

WIRING DIAGRAM

INSPECTION PROCEDURE

1

Preparation. (See step ” 1 ” on page

DI–359

)

DI0B3–01

R14286

R05901

H00057

Airbag Sensor
Assembly

Spiral
Cable

P Squib

D Squib

D+

D–

(+)

(–)

R05895

AB0118

R13006

AB0069

AB0119

W02044

H00017

Airbag Sensor
Assembly

Spiral
Cable

D Squib

P Squib

D+

D–

ACC

ON

or

DLC1

E1

Tc

Code 14

DI–348

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

500

1997 LEXUS ES300 (RM511U)

2

Check D squib circuit.

CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the resistance between
D+ and D–.
OK:

Resistance: Below 1

Ω

NG

Go to step ” 5 ”.

OK

3

Check airbag sensor assembly.

PREPARATION:
(a)

Connect connector to airbag sensor assembly.

(b)

Using a service wire, connect D+ and D– on spiral cable
side of connector between spiral cable and steering
wheel pad.

(c)

Connect negative (–) terminal cable to battery, and wait
at least 2 seconds.

CHECK:
(a)

Turn ignition switch to ACC or ON and wait at least 20 se-
conds.

(b)

Clear malfunction code stored in memory
(See page

DI–324

).

(c)

Turn ignition switch to LOCK, and wait at least 20 se-
conds.

(d)

Turn ignition switch to ACC or ON, and wait at least 20 se-
conds.

(e)

Using SST, connect terminals Tc and E1 of DLC 1.
SST 09843–18020

(f)

Check DTC.

OK:

DTC 14 is not output.

HINT:
Codes other than code 14 may be output at this time, but they
are relevant to this check.