Lexus RX300 (MCU15). Manual - part 284

H01019
H16276

H16625

Squib (LH)

Airbag 
Sensor 
Assembly

(–)

(+)

SFL+

DI–368

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

DTC

B0117/45

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

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 B0117/45 is recorded when ground short is detected in the side squib (LH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0117/45

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

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 side airbag assembly side) between
the side airbag assembly (LH) and the airbag sensor assembly,
measure the resistance between SFL+ and body ground.
OK:

Resistance: 1 MΩ or Higher

NG

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

OK

DI6PH–03

AB0119

H10600

H01017

H01071

H16278

H16626

Squib (LH)

Airbag 
Sensor 
Assembly

SFL+

SFL–

→

 ←

DLC3

ON

CG

Tc

DTC B0117/45

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–369

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 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 B0117/45 is not output.

HINT:
Codes other than code B0117/45 may be output at this time, but
they are not relevant to this check.

NG

Replace airbag sensor assembly.

OK

H10600

H01018 AB0119

H01071

H12030

→ ←

Tc

Airbag 
Sensor 
Assembly

Squib (LH)

DTC B0117/45

ON

DLC3

CG

DI–370

–

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 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 B0117/45 is not output.

HINT:
Codes other than code B0117/45 may be output at this time, but
they are not relevant to this check.

NG

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

H01016

AB0119

H16277

H16627

Squib (LH)

Airbag 
Sensor 
Assembly

SFL+

(–)

(+)

ON

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–371

LEXUS RX300   (RM785E)

DTC

B0118/46

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

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 B0118/46 is recorded when a B+ short is detected in the side squib (LH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0118/46

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

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:
(a)

Turn the ignition switch to ON.

(b)

For the connector (on the side airbag assembly side) be-
tween the side airbag assembly (LH) and the airbag sen-
sor assembly, measure the voltage between SFL+ and
body ground.

OK:

Voltage: 0 V

NG

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

OK

DI6PI–03