Lexus RX300 (MCU15). Manual - part 294

AB0119

H01012

H01065

H10600

H13119

Airbag 
Sensor 
Assembly

Side Airbag Sensor 
Assembly (RH)

CG

Tc

ON

DTC B1140/32

→

 ←

DLC3

DI–408

–

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 (RH) from the connec-
tor and connect the side airbag sensor (LH) 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 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 airbag sensor assembly.

OK

AB0119

H01007

H01066

H10600

H12033

Airbag 
Sensor 
Assembly

Side Airbag Sensor 
Assembly (RH)

CG

Tc

ON

DTC B1141/33

→

 ←

DLC3

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–409

LEXUS RX300   (RM785E)

10

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

H01450

Side Airbag Sensor Assembly (LH)

Airbag Sensor Assembly

LG–B

L–W

P–L

ESL

FSL

SSL+

VUPL

4

3

2

1

A27

12

10

9

7

GR–L

ESL

FSL

SSL+

VUPL

A27

A27

A27

DI–410

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

DTC

B1141/33

Side Airbag Sensor Assembly (LH) 
Malfunction

CIRCUIT DESCRIPTION

The side airbag sensor assembly (LH) consists of the safing sensor, diagnosis circuit and lateral deceleration
sensor, etc. 
It receives signals from the lateral deceleration sensor, judges whether or not the SRS must be activated,
and detects diagnosis system malfunction. 
DTC B1141/33 is recorded when occurrence of a malfunction in the side airbag sensor assembly (LH) is
detected.

DTC No.

DTC Detecting Condition

Trouble Area

B1141/33

S Side airbag sensor assembly (LH) malfunction

S Side airbag sensor assembly (LH)

S Wire harness

S Airbag sensor assembly

WIRING DIAGRAM

DI6PT–04

AB0119

H09530

H10600

H12034

ON

CG

Tc

DTC B1141/33

DLC3

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–411

LEXUS RX300   (RM785E)

INSPECTION PROCEDURE

1

Is DTC B1141/33 out put?

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).

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

YES

The malfunctioning part can now be considered
normal. To make sure of this, use the simulation
method to check.

NO

2

Is connector of side airbag sensor assembly (LH) properly connected?

3

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