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DI-444
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI4D5-06

DTC B0136/74 Open in P/T Squib (LH) Circuit

CIRCUIT DESCRIPTION
The P/T squib circuit (LH) consists of the airbag sensor assembly and seat belt pretensioner (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 B0136/74 is recorded when an open is detected in the P/T squib (LH) circuit.
DTC No. DTC Detecting Condition Trouble Area
S Open circuit in PL+ wire harness or PL- wire harness of
S Seat belt pretensioner (LH)
squib
B0136/74 S Airbag sensor assembly
S P/T squib (LH) malfunction
S Wire harness
S Airbag sensor assembly malfunction

WIRING DIAGRAM
See page DI-440 .

INSPECTION PROCEDURE

1 Prepare for inspection (See step 1 on page DI-486 ).

2 Check P/T squib (LH) circuit.

CHECK:
For the connector (on the seat belt pretensioner side) between
Airbag
Sensor
the seat belt pretensioner (LH) and the airbag sensor assembly,
P/T Squib (LH)
Assembly measure the resistance between PL+ and PL-.
OK:
Resistance: Below 1

PL+ PL-

(+) (-) NG Repair or replace harness or connector be-
tween seat belt pretensioner (LH) and airbag
H01016
H02141 H02213 sensor assembly.

2001 SIENNA (RM787U)

Author : Date : 598
DI-445
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM

3 Check airbag sensor assembly.

P/T Squib (LH) PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
Airbag (b) Using a service wire, connect PL+ and PL- of the connec-
Sensor
tor (on the seat belt pretensioner side) between the seat
Assembly
belt pretensioner (LH) and the airbag sensor assembly.
(c) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
PL+ PL- ACC ON CHECK:
(a) Turn the ignition switch to ACC or ON and wait at least for
20 seconds.
or (b) Clear the DTC stored in memory (See page DI-358 ).
(c) Turn the ignition switch to LOCK, and wait at least for 20
DLC1 seconds.
DTC B0136/74 (d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(e) Check the DTC (See page DI-358 ).
OK:
E1 Tc
H01017 DTC B0136/74 is not output.
H02139
AB0118 AB0119 HINT:
R13006 H01087 H02214

Codes other than code B0136/74 may be output at this time, but
they are not relevant to this check.

NG Replace airbag sensor assembly.

2001 SIENNA (RM787U)

Author : Date : 599
DI-446
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM

4 Check P/T squib (LH).

PREPARATION:
P/T Squib (LH) (a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
Airbag
Sensor and wait at least for 90 seconds.
Assembly (c) Connect the seat belt pretensioner (LH) connector.
(d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
ACC ON CHECK:
(a) Turn the ignition switch to ACC or ON, and wait at least
or for 20 seconds.
(b) Clear the DTC stored in memory (See page DI-358 ).
(c) Turn the ignition switch to LOCK, and wait at least for 20
DLC1
DTC B0136/74 seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(e) Check the DTC (See page DI-358 ).
E1 Tc OK:
H01018
DTC B0136/74 is not output.
AB0118 AB0119
R13006 H01087 H01232 HINT:
Codes other than code B0136/74 may be output at this time, but
they are not relevant to this check.

NG Replace seat belt pretensioner (LH).

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.

2001 SIENNA (RM787U)

Author : Date : 600

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