Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 1998-2003 Approved FSM 05 rs cib01031
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DI-384
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI4DN-05
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-371 .
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-486 ).
2 Check D squib circuit.
ON
CHECK:
(a) Turn ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
Spiral
Airbag spiral cable and the steering wheel pad, measure the volt-
Sensor
Cable age between D+ and body ground.
Assembly
D Squib OK:
Voltage: 0 V
D+
(-) (+)
AB0119 NG Go to step 5.
H01001
H02146 H11570
OK
2001 SIENNA (RM787U)
Author : Date : 538
DI-385
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
Airbag
Spiral (b) Using a service wire, connect D+ and D- of the connector
Sensor
Cable (on the spiral cable side) between the spiral cable and the
Assembly
D Squib steering wheel pad.
(c) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
ACC ON
CHECK:
D- D+ (a) Turn the ignition switch to ACC or ON, and wait at least
or for 20 seconds.
(b) Clear the DTC stored in memory
(See step 5 on page DI-358 ).
DTC B0103/12 (c) Turn the ignition switch to LOCK, and wait at least for 20
DLC1
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 OK:
H01002 H02144
AB0118 AB0119 DTC B0103/12 is not output.
R13006 W02043 H02218
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
2001 SIENNA (RM787U)
Author : Date : 539
DI-386
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:
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
(See step 5 on page DI-358 ).
DTC B0103/12 (c) Turn the ignition switch to LOCK, and wait at least for 20
DLC1
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 ).
H01003 OK:
AB0118 AB0019
R13006 W02043 H01132 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.
2001 SIENNA (RM787U)
Author : Date : 540
DI-387
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 Check spiral cable.
PREPARATION:
(a) Turn the ignition switch to LOCK.
Spiral
Airbag (b) Disconnect the connector between the airbag sensor as-
Sensor sembly and the spiral cable.
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
NG Repair or replace harness between airbag sen-
H01004 sor assembly and spiral cable.
R14288 H08261
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 : 541
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