Lexus RX300 (MCU15). Service manual - part 283

H10600

H01018

H01073

AB0119

H12026

→ ←

Airbag 
Sensor 
Assembly

Squib (LH)

DTC B0115/47

DLC3

Tc

CG

ON

DI–364

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

4

Check side squib (LH).

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 (LH) connector.

(d)

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

CHECK:
(a)

Turn the ignition switch to LOOK, and wait at least for 20
second.

(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 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 side airbag assembly (LH).

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.

H01019
H16275

H16623

Squib (LH)

Airbag 
Sensor 
Assembly

(–)

(+)

SFL–

SFL+

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–365

LEXUS RX300   (RM785E)

DTC

B0116/48

Open 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 B0116/48 is recorded when an open is detected in the side squib (LH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0116/48

S Open circuit in SFL+ wire harness or 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

See page DI–361.

INSPECTION PROCEDURE

1

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

2

Check side squib (LH) circuit.

CHECK:
For the connector (on the front side airbag assembly side) be-
tween the front side airbag assembly (LH) and the airbag sen-
sor assembly, measure the resistance between SFL+ and
SFL–.
OK:

Resistance: Below 1 Ω

NG

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

OK

DI6PG–03

AB0119
H01074

H10600

H01017

H16278

H16624

Squib (LH)

Airbag 
Sensor 
Assembly

SFL+

CG

DTC B0116/48

→

 ←

DLC3

ON

SFL–

Tc

DI–366

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

3

Check airbag sensor assembly.

PREPARATION:
(a)

Connect the connector to the airbag sensor assembly.

(b)

Using a service wire, connect SFL+ and SFL– of the con-
nector (on the side airbag assembly side) between the
side airbag assembly (LH) and the airbag sensor assem-
bly.

(c)

Connect negative (–) terminal cable to the battery, and
wait at least 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 B0116/48 is not output.

HINT:
Codes other than code B0116/48 may be output at this time, but
they are not relevant to this check.

NG

Replace side airbag sensor assembly.

OK

H10600 H01074

H01018 AB0119

H12028

→ ←

Airbag 
Sensor 
Assembly

Squib (LH)

ON

DLC3

DTC B0116/48

Tc

CG

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–367

LEXUS RX300   (RM785E)

4

Check side squib (LH).

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 side airbag assembly (LH) 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 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 B0116/48 is not output.

HINT:
Codes other than code B0116/48 may be output at this time, but
they are not relevant to this check.

NG

Replace side airbag assembly (LH).

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.