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DI-267
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI4L3-12
DTC B0103/12 Short in D Squib Circuit (to B+)
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
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 B0103/12 is recorded when a B+ short is detected in the D squib circuit.
DTC No. DTC Detecting Condition Trouble Area
S Short circuit in D squib wire harness (to B+) S Steering wheel pad (D squib)
S D squib malfunction S Spiral cable
B0103/12
S Spiral cable malfunction S Airbag sensor assembly
S Airbag sensor assembly malfunction S Wire harness
WIRING DIAGRAM
See page DI-254 .
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-390 ).
2 Check D squib circuit.
CHECK:
(a) Turn the ignition switch to ON.
D Squib
Airbag (b) For the connector (on the spiral cable side) between the
Spiral Sensor spiral cable and the steering wheel pad, measure the volt-
Cable Assembly age between D+ and body ground.
OK:
Voltage: 0 V
ON
D+
(-) (+)
H01001
AB0119 NG Go to step 5.
H02146 H04689
OK
2002 ECHO (RM884U)
Author : Date : 437
DI-268
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 Check airbag sensor assembly.
PREPARATION:
D Squib (a) Connect the connector to the airbag sensor assembly.
Airbag
Spiral Sensor (b) Using a service wire, connect D+ and D- of the connector
Cable Assembly (on the spiral cable side) between the spiral cable and the
steering wheel pad.
(c) 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-
D- D+
conds.
(b) Clear DTC stored in memory (See step 5 on page
DI-239 ).
DLC3 DTC B0103/12 (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 OK:
H01002
H02144 AB0119
H10600 W02043 H10608 DTC B0103/12 is not output.
HINT:
Codes other than code B0103/12 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 : 438
DI-269
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 Check D squib.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
Airbag
Spiral and wait at least for 90 seconds.
Sensor
Cable Assembly (c) Connect the steering wheel pad connector.
D Squib (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 ).
DTC B0103/12 (c) Turn the ignition switch to LOCK, and wait at least for 20
DLC3
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 ).
H01003
OK:
AB0019
H10600 W02043 H10609 DTC B0103/12 is not output.
HINT:
Codes other than code B0103/12 may be output at this time, but
they are not relevant to this check.
NG Replace steering wheel pad.
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 : 439
DI-270
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 Check spiral cable.
PREPARATION:
(a) Turn ignition switch to LOCK.
Spiral
Airbag (b) Disconnect the connector between the airbag sensor as-
Sensor
Cable sembly and the spiral cable.
Assembly
D Squib CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
ON
spiral cable and the steering wheel pad, measure the volt-
age between D+ and body ground.
D+
OK:
Voltage: 0 V
(-) (+)
H01000
AB0119
H02202
NG Repair or replace spiral cable.
H02146
OK
6 Check harness between airbag sensor assembly and spiral cable.
ON CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
Spiral Airbag spiral cable and airbag sensor assembly, measure the
Sensor
Cable Assembly
voltage between D+ and body ground.
D Squib OK:
Voltage: 0 V
D+
(-) (+)
AB0119
H01004
H02146 H10610
NG Repair or replace harness between airbag sen-
sor assembly and spiral cable.
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 : 440
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