Lexus RX300 (MCU15). Manual - part 296

AB0119

H01007

H01066

H10600

H12033

Airbag 
Sensor 
Assembly

Side Airbag Sensor 
Assembly (RH)

CG

Tc

ON

DTC B1141/33

→

 ←

DLC3

DI–416

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

9

Check airbag sensor assembly.

PREPARATION:
(a)

Turn the ignition switch to LOCK.

(b)

Disconnect negative (–) terminal cable from the battery,
and wait at least for 90 seconds.

(c)

Disconnect the side airbag sensor (LH) from the connec-
tor and connect the side airbag sensor (RH) to the con-
nector.

(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 B1141/33 is not output.

HINT:
Codes other than code B1141/33 may be output at this time, but
they are not relevant to this check.

NG

Replace airbag sensor assembly.

OK

AB0119

H01012

H01065

H10600

H13119

Airbag 
Sensor 
Assembly

Side Airbag Sensor 
Assembly (LH)

CG

Tc

ON

DTC B1140/32

→

 ←

DLC3

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–417

LEXUS RX300   (RM785E)

10

Check side airbag sensor assembly (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 sensor (LH) to the connector that
the side airbag sensor (RH) was connected to.

(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 B1140/32 is not output.

HINT:
Codes other than code B1140/32 may be output at this time, but
they are not relevant to this check.

NG

Replace side airbag sensor 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.

H02750

Airbag Sensor Assembly

Front Airbag Sensor (RH)

+SR

–SR

A28

A28

9

20

B–W

BR–W

II2

1

2

W

B

2

1

+SR

–SR

II2

DI–418

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

DTC

B1156/B1157/15

Front Airbag Sensor (RH) Malfunction

CIRCUIT DESCRIPTION

The front airbag sensor (RH) circuit consists of the airbag sensor assembly and front airbag sensor (RH).
For details of the function of each component, see OPERATION on page RS–2. 
DTC B1156/B1157/15 is recorded when a malfunction is detected in the front airbag sensor (RH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B1156/B1157/15

S Front airbag sensor (RH) malfunction

S Front airbag sensor (RH)

S Airbag sensor assembly

S Wire harness

S Engine room No. 2 wire harness

WIRING DIAGRAM

DI6PW–07

H03363

H03355

AB0119

H03445

Airbag 
Sensor 
Assembly

Front Airbag 
Sensor (RH)

(+)

+SR

(–)

–SR

Airbag Sensor 
Assembly

ON

H03361

H03353

H03443

Airbag 
Sensor 
Assembly

Front Airbag 
Sensor (RH)

(+)

+SR

(–)

–SR

Airbag Sensor 
Assembly

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–419

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

1

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

2

Check wire harness (to B+).

CHECK:
(a)

Turn the ignition switch to ON.

(b)

For the connector (on the airbag sensor assembly side)
between the front airbag sensor (RH) and the airbag sen-
sor assembly, measure the voltage between body ground
and each of +SR and –SR.

OK:

Voltage: Below 1 V

NG

Go to step 8.

OK

3

Check wire harness (to ground).

CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the front airbag sensor (RH) and the airbag sensor as-
sembly, measure the resistance between body ground and
each of +SR and –SR.
OK:

Resistance: 1 MΩ or Higher

NG

Go to step 9.

OK