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DI-404
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI58L-02
DTC B0103/12 Short in D and P Squib Circuit (to B+)
CIRCUIT DESCRIPTION
The D and P squib circuits consist of the airbag sensor assembly, spiral cable, steering wheel pad 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 page OPERATION on page RS-2 .
DTC B0103/12 is recorded when B+ short is detected in the D and P squib circuits.
DTC No. DTC Detecting Condition Trouble Area
S Short circuit in D squib wire harness (to B+)
S Steering wheel pad (D squib)
S Short circuit in P squib wire harness (to B+)
S Front passenger airbag assembly (P squib)
S D squib malfunction
B0103/12 S Spiral cable
S P squib malfunction
S Airbag sensor assembly
S Spiral cable malfunction
S Wire harness
S Airbag sensor assembly malfunction
WIRING DIAGRAM
See page DI-397 .
INSPECTION PROCEDURE
1 Prepare for inspection. (See step 1 on page DI-456 )
2 Check D squib circuit.
PREPARATION:
ON
Turn ignition switch ON
CHECK:
Airbag For the connector (on the spiral cable side) between the spiral
Sensor cable and steering wheel pad, measure the voltage between
Assembly
Spiral D+ and body ground.
Cable OK:
D Squib
Voltage: Below 1 V
D+
(-) (+)
NG Go to step 7.
AB0119
H03099
H02146 H03022
OK
2002 4RUNNER (RM887U)
Author : Date : 580
DI-405
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 Check P squib circuit.
CHECK:
For the connector (on the front passenger airbag assembly
P+ ON
side) between the front passenger airbag assembly and airbag
sensor assembly, measure the voltage between P+ and body
ground.
(-) (+) OK:
Voltage: Below 1 V
Airbag
P Squib
Sensor
Assembly
Spiral
Cable
H02146 AB0119
H03100 H03035
NG Repair or replace harness or connector be-
tween front passenger airbag assembly and air-
bag sensor assembly.
OK
2002 4RUNNER (RM887U)
Author : Date : 581
DI-406
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
P- P+ (b) Using a service wire, connect D+ and D- of the connector
(on the spiral cable side) between the spiral cable and
steering wheel pad.
(c) Using a service wire, connect P+ and P- of the connector
(on the front passenger airbag assembly side) between
Airbag
P Squib the front passenger airbag assembly and airbag sensor.
Sensor
D Squib Assembly (d) Connect negative (-) terminal cable to the battery, and
Spiral
Cable wait at least for 2 seconds.
CHECK:
(a) Turn ignition switch to ACC or ON and wait at least for 20
ACC ON
seconds.
D- D+ (b) Clear DTC stored in memory.
or (See step 5 on page DI-377 )
(c) Turn ignition switch to LOCK, and wait at least for 20 se-
DTC B0103/12 conds.
DLC1
(d) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
(e) Check DTC.
(See page DI-377 )
E1 Tc
OK:
H02144
H03103 H02144 DTC B0103/12 is not output.
AB0118 AB0119
R13006 W02043 H03023 HINT:
Codes other than DTC B0103/12 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK
2002 4RUNNER (RM887U)
Author : Date : 582
DI-407
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 Check D squib.
PREPARATION:
(a) Turn ignition switch to LOCK.
Airbag (b) Disconnect negative (-) terminal cable from the battery,
Sensor and wait at least for 90 seconds.
Assembly
Spiral (c) Connect the steering wheel pad connector.
Cable (d) Connect negative (-) terminal cable to the battery, and
D Squib
wait at least for 2 seconds.
CHECK:
ACC ON
(a) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
or
(b) Clear DTC stored in memory.
(See step 5 on page DI-377 )
DLC1 DTC B0103/12 (c) Turn ignition switch to LOCK, and wait at least for 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
E1 Tc (e) Check DTC.
H03104 (See page DI-377 )
AB0118 AB0019
R13006 W02043 H03108 OK:
DTC B0103/12 is not output.
HINT:
Codes other than DTC B0103/12 may be output at this time, but
they are not relevant to this check.
NG Replace steering wheel pad.
OK
2002 4RUNNER (RM887U)
Author : Date : 583
DI-408
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
6 Check P squib.
PREPARATION:
(a) Turn ignition switch to LOCK.
Airbag
(b) Disconnect negative (-) terminal cable from the battery,
P Squib
Sensor and wait at least for 90 seconds.
Assembly (c) Connect the front passenger airbag connector.
Spiral
Cable (d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
ACC ON
(a) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
or
(b) Clear DTC stored in memory.
(See step 5 on page DI-377 )
DLC1 DTC B0103/12 (c) Turn ignition switch to LOCK, and wait at least for 20 se-
conds.
(d) Turn ignition switch to ACC or ON, and wait at least for 20
seconds.
E1 Tc (e) Check DTC.
H03106 (See page DI-377 )
AB0118 AB0019
R13006 W02043 H03109 OK:
DTC B0103/12 is not output.
HINT:
Codes other than DTC B0103/12 may be output at this time, but
they are not relevant to this check.
NG Replace front passenger airbag assembly.
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 4RUNNER (RM887U)
Author : Date : 584
DI-409
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
7 Check spiral cable.
PREPARATION:
(a) Turn ignition switch to LOCK.
Airbag (b) Disconnect the connector between the airbag sensor as-
Spiral Sensor sembly and spiral cable.
Cable Assembly
CHECK:
D Squib
(a) Turn ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
D+ ON spiral cable and steering wheel pad, measure the voltage
between D+ and body ground.
OK:
Voltage: Below 1 V
(-) (+)
H01000
H02146
R14288 H03024
NG Repair or replace spiral cable.
OK
8 Check spiral cable.
CHECK:
ON
(a) Turn ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
Airbag spiral cable and airbag sensor assembly, measure the
Spiral Sensor
Cable voltage between D+ and body ground.
D Squib Assembly
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.
2002 4RUNNER (RM887U)
Author : Date : 585
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