Lexus RX300 (MCU15). Service manual - part 295

H01050

H01010

H16250

H16303

Airbag 
Sensor 
Assembly

(–)

(+)

SSL+

Airbag Sensor 
Assembly

ESL

SSL+

ESL

Side Airbag Sensor 
Assembly (LH)

← →

DI–412

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

4

Check wire harness.

PREPARATION:
(a)

Disconnect the side airbag sensor assembly (LH).

(b)

Using a service wire, connect SSL+ and ESL of the con-
nector (on the side airbag sensor assembly side) between
the side airbag sensor assembly (LH) and the airbag sen-
sor assembly.

CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the side airbag sensor assembly (LH) and the airbag
sensor assembly, measure the resistance between SSL+ and
ESL.
OK:

Resistance: Below 1 Ω

NG

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

OK

H01010

H01051

H16249

H16304

Airbag 
Sensor 
Assembly

(–)

(+)

Side Airbag Sensor 
Assembly (LH)

VUPL

Airbag Sensor 
Assembly

VUPL

FSL

FSL

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–413

LEXUS RX300   (RM785E)

5

Check wire harness.

PREPARATION:
Using a service wire, connect VUPL and FSL of the connector
(on the side airbag sensor assembly side) between the side air-
bag sensor assembly (LH) and the airbag sensor assembly.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the side airbag sensor assembly (LH) and the airbag
sensor assembly, measure the resistance between VUPL and
FSL.
OK:

Resistance: Below 1 Ω

NG 

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

OK

H01052

H01008

H01168

Airbag
Sensor
Assembly

SIde Airbag Sensor Assembly
(LH)

Airbag Sensor Assembly

VUPL

(–)

(+)

SSL+

FSL

H01008

H01053

AB0119

H08271

Airbag 
Sensor 
Assembly

Side Airbag Sensor 
Assembly (LH)

Airbag Sensor Assembly

VUPL

(–)

(+)

SSL+

FSL

ESL

ON

DI–414

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

6

Check wire harness (to ground).

CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the side airbag sensor assembly (LH) and the airbag
sensor assembly, measure the resistance between body
ground and each of SSL+, VUPL and FSL.
OK:

Resistance: 1 MΩ or Higher

NG

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

OK

7

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 side airbag sensor assembly (LH) and the
airbag sensor assembly, measure the voltage between
body ground and each of SSL+, ESL, VUPL and FSL.

OK:

Voltage: 0 V

NG

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

OK

AB0119

H01007

H01066

H10600

H12033

Airbag 
Sensor 
Assembly

Side Airbag Sensor Assembly (LH)

CG

Tc

ON

→

 ←

DTC B1141/33

→

 ←

DLC3

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–415

LEXUS RX300   (RM785E)

8

Is DTC B1141/33 out put again?

PREPARATION:
(a)

Connect the connector to the side airbag sensor assem-
bly (LH).

(b)

Connect the connector to the airbag sensor assembly.

(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 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.

NO

Go to step 9.

YES

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.