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DI-278
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI1B8-20

DTC B0107/51 Short in P Squib Circuit (to Ground)

CIRCUIT DESCRIPTION
The P squib circuit consists of the airbag sensor assembly and front passenger airbag assembly.
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 B0107/51 is recorded when ground short is detected in the P squib circuit.
DTC No. DTC Detecting Condition Trouble Area
S Short circuit in P squib wire harness (to ground) S Front passenger airbag assembly (P squib)
B0107/51 S P squib malfunction S Airbag sensor assembly
S Airbag sensor assembly malfunction S Wire harness

WIRING DIAGRAM
See page DI-271 .

INSPECTION PROCEDURE

1 Prepare for inspection (See step 1 on page DI-390 ).

2 Check P squib circuit.

CHECK:
P Squib For the connector (on the front passenger airbag assembly
Airbag side) between the front passenger airbag assembly and the air-
Sensor bag sensor assembly, measure the resistance between P+ and
Assembly
body ground.
OK:
Resistance: 1 M or Higher

P+

(-) (+)

H01227
NG Repair or replace harness or connector be-
H02145 H02254 tween front passenger airbag assembly and air-
bag sensor assembly.

2002 ECHO (RM884U)

Author : Date : 448
DI-279
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM

3 Check airbag sensor assembly.

PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
(b) Using a service wire, connect P+ and P- of the connector
P Squib Airbag (on the front passenger airbag assembly side) between
Sensor
the front passenger airbag assembly and the airbag sen-
Assembly
sor assembly.
(c) Connect negative (-) terminal cable to the battery, and

wait at least for 2 seconds.
ON CHECK:
P- P+ (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
Code B0107/51 DI-239 ).
DLC3
(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
H01023 (e) Check DTC (See page DI-239 ).
H02144 AB0118
H10600 H01075 H10615 OK:
DTC B0107/51 is not output.
HINT:
Codes other than code B0107/51 may be output at this time, but
they are not relevant to this check.

NG Replace airbag sensor assembly.

2002 ECHO (RM884U)

Author : Date : 449
DI-280
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM

4 Check P squib.

PREPARATION:
P Squib (a) Turn the ignition switch to LOCK.
Airbag (b) Disconnect negative (-) terminal cable from the battery,
Sensor and wait at least for 90 seconds.
Assembly
(c) Connect the front passenger airbag assembly 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
DTC B0107/51
DI-239 ).
DLC3 (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 ).
H01024 OK:
AB0119
H10600 H01075 H10616 DTC B0107/51 is not output.
HINT:
Codes other than code B0107/51 may be output at this time, but
they are not relevant to this check.

NG Replace front passenger airbag assembly.

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 : 450

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