Lexus RX300 (MCU15). Service manual - part 287

AB0119

H01021

H01083

H10600

H10622

→ ←

ON

Airbag
Sensor
Assembly

P/T Squib (RH)

DTC B0131/64

DLC3

Tc

CG

DI–380

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

4

Check P/T 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 seat belt pretensioner (RH) 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 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 B0131/64 is not output.

HINT:
Codes other than code B0131/64 may be output at this time, but
they are not relevant to this check.

NG 

Replace seat belt pretensioner (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.

H01019

H16271

H16631

P/T Squib (RH)

Airbag 
Sensor 
Assembly

(+)

(–)

PR+

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–381

LEXUS RX300   (RM785E)

DTC

B0132/61

Short in P/T Squib (RH) Circuit 
(to Ground)

CIRCUIT DESCRIPTION

The P/T squib (RH) circuit consists of the airbag sensor assembly and seat belt pretensioner (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 B0132/61 is recorded when a ground short is detected in the P/T squib (RH) circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B0132/61

S Short circuit in P/T squib (RH) wire harness (to ground)

S P/T squib (RH) malfunction

S Airbag sensor assembly malfunction

S Seat belt pretensioner (RH)

S Airbag sensor assembly

S Wire harness

WIRING DIAGRAM

See page DI–374.

INSPECTION PROCEDURE

1

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

2

Check P/T squib (RH) circuit.

CHECK:
For the connector (on the seat belt pretensioner side) between
the seat belt pretensioner (RH) and the airbag sensor assem-
bly, measure the resistance between PR+ and body ground.
OK:

Resistance: 1 MΩ or Higher

NG

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

OK

DI6PL–06

H01020

AB0119

H01079

H10600

H16273

H16632

P/T Squib (RH)

Airbag
Sensor
Assembly

PR+

PR–

DTC B0132/61

ON

→

 ←

DLC3

Tc

CG

DI–382

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

LEXUS RX300   (RM785E)

3

Check airbag sensor assembly.

PREPARATION:
(a)

Connect the connector to the airbag sensor assembly.

(b)

Using a service wire, connect PR+ and PR– of the con-
nector (on the seat belt pretensioner side) between the
seat belt pretensioner (RH) 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 B0132/61 is not output.

HINT:
Codes other than code B0132/61 may be output at this time, but
they are not relevant to this check.

NG

Replace airbag sensor assembly.

OK

H01021

AB0119

H01079

H10600

H10624

→ ←

ON

Airbag
Sensor
Assembly

P/T Squib (RH)

DTC B0132/61

DLC3

Tc

CG

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–383

LEXUS RX300   (RM785E)

4

Check P/T 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 seat belt pretensioner (RH) 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 B0132/61 is not output.

HINT:
Codes other than code B0132/61 may be output at this time, but
they are not relevant to this check.

NG

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