Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 rs cib01387
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DI-450
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI4D7-05
DTC B0138/72 Short in P/T Squib (LH) Circuit (to B+)
CIRCUIT DESCRIPTION
The P/T squib (LH) circuit 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 B0138/72 is recorded when a B+ short is detected in the P/T squib (LH) circuit.
DTC No. DTC Detecting Condition Trouble Area
S Short circuit in seat belt pretensioner (LH) wire harness
S Seat belt pretensioner (LH)
(to B+)
B0138/72 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.
ON CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the seat belt pretensioner side) be-
Airbag tween the seat belt pretensioner (LH) and the airbag sen-
P/T Squib (LH) Sensor sor assembly, measure the voltage between PL+ and
Assembly body ground.
OK:
Voltage: 0 V
PL+
(-) (+)
NG Repair or replace harness or connector be-
AB0119 tween seat belt pretensioner (LH) and airbag
H01016
H08394 H08269 sensor assembly.
OK
2001 SIENNA (RM787U)
Author : Date : 604
DI-451
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 step 5 on page DI-358 ).
DLC1 DTC B0138/72 (c) Turn the ignition switch to LOCK, and wait at least for 20
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
H01017 OK:
H02139
AB0118 AB0119 DTC B0138/72 is not output.
R13006 H01085 H02217
HINT:
Codes other than code B0138/72 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK
2001 SIENNA (RM787U)
Author : Date : 605
DI-452
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 and wait at least for 90 seconds.
Sensor
Assembly (c) Connect the seat belt pretensioner (LH) connector.
(d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
ACC ON (a) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
or (b) Clear the DTC stored in memory
DLC1 (See step 5 on page DI-358 ).
DTC B0138/72 (c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
E1 Tc (e) Check the DTC (See page DI-358 ).
H01018 OK:
AB0118 AB0119
R13006 H01085 H01222 DTC B0138/72 is not output.
HINT:
Codes other than code B0138/72 may be output at this time, but
they are not relevant to this check.
NG Replace seat belt pretensioner (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. If the malfunctioning part can not be
detected by the simulation method, replace all SRS components including the wire harness.
2001 SIENNA (RM787U)
Author : Date : 606
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