Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Echo 2000-2002 Approved techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 02echorm di rs cib01387
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DI-333
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI1BL-25
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-323 .
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-390 ).
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
2002 ECHO (RM884U)
Author : Date : 503
DI-334
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-
ON CHECK:
(a) Turn the ignition switch to ON and wait at least for 20 se-
conds.
(b) Clear DTC stored in memory (See step 5 on page
DI-239 ).
DLC3 DTC B0138/72 (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 DTC (See page DI-239 ).
CG Tc
H01017 OK:
H02139 AB0119
H10600 H01085 H10633 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 airbag sensor assembly.
OK
2002 ECHO (RM884U)
Author : Date : 504
DI-335
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.
CHECK:
ON
(a) Turn the ignition switch to ON, and wait at least for 20 se-
conds.
(b) Clear DTC stored in memory (See step 5 on page
DI-239 ).
DLC3 DTC B0138/72 (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.
CG Tc (e) Check DTC (See page DI-239 ).
H01018 OK:
AB0119
H10600 H01085 H10634 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.
2002 ECHO (RM884U)
Author : Date : 505
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