Lexus RX300 (MCU15). Service manual - part 282

AB0119
H01068

H10600

H01021

H12024

→ ←

Airbag 
Sensor 
Assembly

Squib (RH)

ON

CG

DTC B0113/42

DLC3

Tc

DI–360

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

4

Check side squib (RH).

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 front side airbag assembly (RH) connector.

(d)

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 step 5 on 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 B0113/42 is not output.

HINT:
Codes other than code B0113/42 may be output at this time, but
they are not relevant to this check.

NG 

Replace side airbag assembly (RH).

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. If the malfunctioning part can not be
detected by the simulation method, replace all SRS components including the wire harness.

H01454

Side Squib (LH)

Airbag Sensor Assembly

SFL+

SFL–

Y–R

Y–G

1

2

5

6

A27

A27

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–361

LEXUS RX300   (RM785E)

DTC

B0115/47

Short in Side Squib (LH) Circuit

CIRCUIT DESCRIPTION

The side squib (LH) circuit consists of the airbag sensor assembly and side airbag assembly (LH). 
It causes the SRS to deploy when the SRS deployment conditions are satisfied. 
For details of the function of each component, see OPERATION on page RS–2. 
DTC B0115/47 is recorded when a short is detected in the side squib (LH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0115/47

S Short circuit between SFL+ wire harness and SFL– wire

harness of squib

S Side squib (LH) malfunction

S Airbag sensor assembly malfunction

S Side airbag assembly (LH)

S Airbag sensor assembly

S Wire harness

WIRING DIAGRAM

DI6PF–05

H01019
H16275

H16623

Squib (LH)

Airbag 
Sensor 
Assembly

SFL+

(–)

(+)

SFL–

DI–362

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

1

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

2

Check side squib (LH) circuit.

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

Resistance: 1 MΩ or Higher

NG

Repair or replace harness or connector be-
tween side airbag assembly (LH) and airbag
sensor assembly.

OK

AB0119

H01017

H01073

H10600

H12025

Squib (LH)

Airbag 
Sensor 
Assembly

→

 ←

ON

DTC B0115/47

DLC3

Tc

CG

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–363

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 or ON, and wait at least for 20 se-
conds.

(e)

Check the DTC (See page DI–305).

OK:

DTC B0115/47 is not output.

HINT:
Codes other than code B0115/47 may be output at this time, but
they are not relevant to this check.

NG

Replace airbag sensor assembly.

OK