Lexus RX300 (MCU15). Service manual - part 279

H01454

Side Squib (RH)

Airbag Sensor Assembly

SFR+

SFR–

Y–R

Y–G

1

2

2

1

A29

A28

DI–348

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

DTC

B0110/43

Short 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 B0110/43 is recorded when a short is detected in the side squib (RH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0110/43

S Short circuit between SFR+ wire harness and 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

DI6PB–05

H01019

H16275

H16616

Squib (RH)

Airbag 
Sensor 
Assembly

SFR+

(–)

(+)

SFR–

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–349

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

1

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

2

Check side squib (RH) 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 (RH)
(See page DI–305).
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 SFR–.
OK:

Resistance: 1 MΩ or Higher

NG

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

OK

H10600

H01020

H01069

AB0119

H12017

Squib (RH)

Airbag 
Sensor 
Assembly

DTC B0110/43

→

 ←

ON

DLC3

Tc

CG

DI–350

–

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

(e)

Check the DTC (See page DI–305).

OK:

DTC B0110/43 is not output.

HINT:
Codes other than code B0110/43 may be output at this time, but
they are not relevant to this check.

NG

Replace airbag sensor assembly.

OK

H10600

H01020

H01069

AB0119

H12018

→ ←

Squib (RH)

Airbag 
Sensor 
Assembly

DLC3

DTC B0110/43

ON

Tc

CG

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–351

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 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 B0110/43 is not output.

HINT:
Codes other than code B0110/43 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.