Lexus RX300 (MCU15). Manual - part 281

AB0119

H10600

H01020
H16278

H01067

H16619

Airbag 
Sensor 
Assembly

Squib (RH)

SFR–

DLC3

→

 ←

SFR+

Tc

CG

ON

DTC B0112/41

DI–356

–

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 SFR+ and SFR– of the con-
nector (on the side airbag assembly side) between the
side airbag assembly (RH) and the airbag sensor assem-
bly.

(c)

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 B0112/41 is not output.

HINT:
Codes other than code B0112/41 may be output at this time, but
they are not relevant to this check.

NG

Replace airbag sensor assembly.

OK

H10600

H01021 AB0119

H01067

H16620

→ ←

DTC B0112/41

Tc

CG

ON

Airbag 
Sensor 
Assembly

Squib (RH)

DLC3

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–357

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 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 B0112/41 is not output.

HINT:
Codes other than code B0112/41 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.

H01019
AB0119
H16277

H16621

Squib (RH)

Airbag 
Sensor 
Assembly

(–)

(+)

SFR+

ON

DI–358

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

DTC

B0113/42

Short in Side Squib (RH) Circuit (to B+)

CIRCUIT DESCRIPTION

The side squib (RH) circuit consists of the airbag sensor assembly and side airbag assembly (RH). 
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 B0113/42 is recorded when a B+ short is detected in the side squib (RH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0113/42

S Short circuit in side squib (RH) wire harness (to B+)

S Side squib (RH) malfunction

S Airbag sensor assembly malfunction

S Side airbag assembly (RH)

S Airbag sensor assembly

S Wire harness

WIRING DIAGRAM

See page DI–348.

INSPECTION PROCEDURE

1

Prepare for inspection (See step 1 on page DI–305).

2

Check side squib (RH) circuit.

CHECK:
(a)

Turn the ignition switch to ON.

(b)

For the connector (on the airbag sensor assembly side)
between the side airbag assembly (RH) and the airbag
sensor assembly, measure the voltage between SFR+
and body ground.

OK:

Voltage: 0 V

NG

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

OK

DI6PE–03

H10600 H01068

AB0119

H01020
H16278

H16622

→ ←

DLC3

DTC B0113/42

Squib (RH)

Airbag 
Sensor 
Assembly

SFR–

SFR+

ON

CG

Tc

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–359

LEXUS RX300   (RM785E)

3

Check airbag sensor assembly.

PREPARATION:
(a)

Connect the connector to the airbag sensor assembly.

(b)

Using a service wire, connect SFR+ and SFR– of the con-
nector (on the front side airbag assembly side) between
the front side airbag assembly (RH) and the airbag sensor
assembly.

(c)

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 airbag sensor assembly.

OK