Lexus RX300 (MCU15). Service manual - part 280

H01019

H16275

H16616

Squib (RH)

Airbag 
Sensor 
Assembly

(–)

(+)

SFR+

SFR–

DI–352

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

DTC

B0111/44

Open in Side Squib (RH) Circuit

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 B0111/44 is recorded when an open is detected in the side squib (RH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0111/44

S Open circuit in SFR+ wire harness or SFR– wire harness

of squib

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–431).

2

Check front side squib (RH) circuit.

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

Resistance: Below 1 Ω

NG

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

OK

DI6PC–03

AB0119

H01070

H10600

H01020

H16278

H16617

Squib (RH)

Airbag 
Sensor 
Assembly

SFR+

SFR–

DTC B0111/44

→

 ←

ON

DLC3

CG

Tc

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–353

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 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 B0111/44 is not output.

HINT:
4Codes other than code B0111/44 may be output at this time,
but they are not relevant to this check.

NG

Replace airbag sensor assembly.

OK

H10600

H01021

H01070

AB0119

H12020

→ ←

Squib (RH)

Airbag 
Sensor 
Assembly

DTC B0111/44

ON

DLC3

CG

Tc

DI–354

–

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 page DI–305).

(c)

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

(d)

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

(e)

Check the DTC (See page DI–305).

OK:

DTC B0111/44 is not output.

HINT:
Codes other than code B0111/44 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.

H01019
H16276

H16618

Airbag 
Sensor 
Assembly

Squib (RH)

(+)

SFR+

(–)

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–355

LEXUS RX300   (RM785E)

DTC

B0112/41

Short in Side Squib (RH) Circuit 
(to Ground)

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 B0112/41 is recorded when ground short is detected in the side squib (RH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0112/41

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

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–431).

2

Check side squib (RH) circuit.

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

Resistance: 1 MΩ or Higher

NG

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

OK

DI6PD–03