Lexus RX300 (MCU15). Service manual — part 272

FI1390

AB0119

H01002

H10600

H10598

D Squib

Spiral
Cable

Airbag

Sensor

Assembly

ON

DTC B0100/13

DLC3

→ ←

Tc

CG

DI–320

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300 (RM785E)

3

Check airbag sensor assembly.

PREPARATION:
(a)

Connect the connector to the airbag sensor assembly.

(b)

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

CHECK:
(a)

Turn the ignition switch to ON and wait at least for 20 se-
conds.

(b)

Clear the DTC stored in memory (See page DI–305).

(c)

Turn the ignition switch to LOCK, and wait at least for 20
seconds.

(d)

Turn the ignition switch to ON, and wait at least for 20 se-
conds.

(e)

Check the DTC (See page DI–305).

OK:

DTC B0100/13 is not output.

HINT:
Codes other than code B0100/13 may be output at this time, but
they are not relevant to this check.

NG

Replace airbag sensor assembly.

OK

AB0119

FI1390

H01003

H10600

H10599

D Squib

Spiral
Cable

Airbag
Sensor
Assembly

ON

DTC B0100/13

DLC3

→

←

Tc

CG

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–321

LEXUS RX300 (RM785E)

4

Check D squib.

PREPARATION:
(a)

Turn the ignition switch to LOCK.

(b)

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

(c)

Connect the steering wheel pad connector.

(d)

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

CHECK:
(a)

Turn the ignition switch to LOCK, and wait at least for 20
seconds.

(b)

Turn the ignition switch to ON, and wait at least for 20 se-
conds.

(c)

Clear the DTC stored in memory (See page DI–305).

(d)

Turn the ignition switch to LOCK, and wait at least for 20
seconds.

(e)

Turn the ignition switch to ON, and wait at least for 20 se-
conds.

(f)

Check the DTC (See page DI–305).

OK:

DTC B0100/13 is not output.

HINT:
Codes other than code B0100/13 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.

H01000

H02142

H02195

D Squib

Spiral
Cable

Airbag

Sensor

Assembly

D+

← →

(–)

(+)

D–

R14286

H01004

H01138

D Squib

Spiral
Cable

Airbag

Sensor

Assembly

D+

(–)

(+)

D–

DI–322

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300 (RM785E)

5

Check spiral cable.

PREPARATION:
(a)

Disconnect the connector between the airbag sensor as-
sembly and the spiral cable.

(b)

Release the airbag activation prevention mechanism of
the spiral cable connector on the airbag sensor assembly
side (See page DI–305).

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

Resistance: 1 MΩ or Higher

NG

Repair or replace spiral cable.

OK3

6

Check harness between airbag sensor assembly and spiral cable.

PREPARATION:
Release the airbag activation prevention mechanism of the
connector (on the airbag sensor assembly side) between the
airbag sensor assembly and the spiral cable (See page
DI–305).
CHECK:
For the connector (on the spiral cable side) between the airbag
sensor assembly and the spiral cable, measure the resistance
between D+ and D–.
OK:

Resistance: 1 MΩ 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.

H01001

H02142

H02196

D Squib

Spiral
Cable

Airbag

Sensor

Assembly

D+

(–)

(+)

D–

← →

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–323

LEXUS RX300 (RM785E)

DTC

B0101/14

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 component, see OPERATION on page RS–2.
DTC B0101/14 is recorded when an open is detected in the D squib circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0101/14

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

squib

S D squib malfunction

S Spiral cable malfunction

S Airbag sensor assembly malfunction

S Steering wheel pad (D squib)

S Spiral cable

S Airbag sensor assembly

S Wire harness

WIRING DIAGRAM

See page DI–318.

INSPECTION PROCEDURE

1

Prepare for inspection (See step 1 on page DI–431).

2

Check D squib circuit.

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

Resistance: Below 1 Ω

NG

Go to step 5.

OK

DI6P4–06