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DI-323
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI16W-46
DTC B0135/73 Short in P/T Squib (LH) Circuit
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 B0135/73 is recorded when a short is detected in the P/T squib (LH) circuit.
DTC No. DTC Detecting Condition Trouble Area
S Short circuit between PL+ wire harness and PL- wire har-
S Seat belt pretensioner (LH)
ness of squib
B0135/73 S Airbag sensor assembly
S P/T squib (LH) malfunction
S Wire harness
S Airbag sensor assembly malfunction
WIRING DIAGRAM
Airbag Sensor Assembly
P14
P/T Squib (LH)
2
1 Y-B
C3 PL+
2 1
Y
C3 PL-
H01454
2002 ECHO (RM884U)
Author : Date : 493
DI-324
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 Prepare for inspection. (See step 1 on page DI-390 )
2 Check P/T squib (LH) circuit.
PREPARATION:
Release the airbag activation prevention mechanism of the
Airbag
connector (on the airbag sensor assembly side) between the
P/T Squib (LH) Sensor
Assembly airbag sensor assembly and the seat belt pretensioner (LH).
(See page DI-239 )
CHECK:
For the connector (on the seat belt pretensioner side) between
PL+ PL- the seat belt pretensioner (LH) and the airbag sensor assembly,
measure the resistance between PL+ and PL-.
OK:
Resistance: 1 M or Higher
(+) (-)
H01016
H02141 H02211
NG Repair or replace harness or connector be-
tween seat belt pretensioner (LH) and airbag
sensor assembly.
OK
2002 ECHO (RM884U)
Author : Date : 494
DI-325
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) Connect negative (-) terminal cable to the battery, and
Sensor wait at least for 2 seconds.
Assembly CHECK:
(a) Turn the ignition switch to ON and wait at least for 20 se-
conds.
(b) Clear DTC stored in memory. (See page DI-239 )
ON
(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.
DLC3 DTC B0135/73 (e) Check DTC. (See page DI-239 )
OK:
DTC B0135/73 is not output.
HINT:
CG Tc Codes other than code B0135/73 may be output at this time, but
H01017
they are not relevant to this check.
AB0119
H10600 H01086 H10627
NG Replace airbag sensor assembly.
OK
2002 ECHO (RM884U)
Author : Date : 495
DI-326
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 Check P/T squib (LH).
PREPARATION:
(a) Turn the ignition switch to LOCK.
Airbag (b) Disconnect negative (-) terminal cable from the battery,
P/T Squib (LH) 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.
ON CHECK:
(a) Turn the ignition switch to LOOK, and wait at least for 20
second.
(b) Turn the ignition switch to ON, and wait at least for 20 se-
conds.
DLC3 DTC B0135/73 (c) Clear DTC stored in memory. (See page DI-239 )
(d) Turn ignition switch to LOCK, and wait at least for 20 se-
conds.
(e) Turn the ignition switch to ON, and wait at least for 20 se-
CG Tc
conds.
H01018 (f) Check DTC. (See page DI-239 )
AB0119
H10600 H01086 H10628 OK:
DTC B0135/73 is not output.
HINT:
Codes other than code B0135/73 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.
2002 ECHO (RM884U)
Author : Date : 496
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