TOYOTA AVALON 2001 Service Repair Manual

H01001H02146
AB0119
H11570
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+
(-) (+)
ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-375
531 Author
: Date
:
2001 AVALON (RM808U)
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-3.
DTC B0103/12 is recorded when a B+ short is detected in the D squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0103/12

Short circuit in D squib wire harness (to B+)

D squib malfunction

Spiral cable malfunction

Airbag sensor assembly malfunction
Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness
WIRING DIAGRAM
See page DI-362.
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-475).
2 Check D squib circuit.
CHECK:
(a) Turn ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
spiral cable and the steering wheel pad, measure the volt-
age between D+ and body ground.
OK:
Voltage: 0 V
NG Go to step 5.
OK
DI4DN-02

H01002AB0118AB0119R13006W02043
H02144H02218
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+
E1 D-
TcACCON
or
DTC B0103/12
" u
DLC1
DI-376
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
532 Author
: Date
:
2001 AVALON (RM808U)
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
(b) Using a service wire, connect D+ and D- of the connector
(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:
(a) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(b) Clear the DTC stored in memory
(See step 5 on page DI-349).
(c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(e) Check the DTC (See page DI-349).
OK:
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

R13006 AB0118 AB0019W02043
H01003
H01132
"u
Spiral
Cable
E1 TcACC ON
or
DTC B0103/12
Airbag
Sensor
Assembly
D Squib
DLC1
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-377
533 Author
: Date
:
2001 AVALON (RM808U)
4 Check D squib.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Connect the steering wheel pad connector.
(d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(b) Clear the DTC stored in memory
(See step 5 on page DI-349).
(c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(e) Check the DTC (See page DI-349).
OK:
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.

H01000AB0119H02146H02202
D SquibSpiral
Cable
Airbag
Sensor
Assembly
D+ u"
(-) (+)ON
H01004R14288
AB0119
H08261
D SquibSpiral
Cable
(-) (+)D+
Airbag
Sensor
Assembly
ON
DI-378
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
534 Author
: Date
:
2001 AVALON (RM808U)
5 Check spiral cable.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect the connector between the airbag sensor as-
sembly and the spiral cable.
CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
spiral cable and the steering wheel pad, measure the volt-
age between D+ and body ground.
OK:
Voltage: 0 V
NG Repair or replace spiral cable.
OK
6 Check harness between airbag sensor assembly and spiral cable.
CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the spiral cable side) between the
spiral cable and airbag sensor assembly, measure the
voltage between D+ and body ground.
OK:
Voltage: 0 V
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.

H01454
P Squib
10Airbag Sensor Assembly
2Y-R
C6
Y-G 1
11P+
P-
C6
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-379
535 Author
: Date
:
2001 AVALON (RM808U)
DTC B0105/53 Short in P Squib Circuit
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-3.
DTC B0105/53 is recorded when a short is detected in the P squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0105/53

Short circuit in P squib wire harness

P squib malfunction

Airbag sensor assembly malfunction
Front passenger airbag assembly (P squib)

Airbag sensor assembly

Wire harness
WIRING DIAGRAM
DI4CO-03

R14286H02142H02251
P Squib
Airbag
Sensor
Assembly
P + P-
(-) (+)
DI-380
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
536 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-475).
2 Check P squib circuit.
PREPARATION:
Release the airbag activation prevention mechanism of the
connector (on the airbag sensor assembly side) between the
front passenger airbag assembly and the airbag sensor assem-
bly (See page DI-349).
CHECK:
For the connector (on the front passenger airbag assembly
side) between the front passenger airbag assembly and the air-
bag sensor assembly, measure the resistance between P+ and
P-.
OK:
Resistance: 1 MW or Higher
NG Repair or replace harness or connector be-
tween front passenger airbag assembly and air-
bag sensor assembly.
OK

H01023AB0118AB0119R13006H01077H07479
P Squib
Airbag
Sensor
Assembly
ACC
or
DTC B0105/53 DLC1
E1
TcON " u
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-381
537 Author
: Date
:
2001 AVALON (RM808U)
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
(b) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to ACC or ON and wait at least for
20 seconds.
(b) Clear the DTC stored in memory (See page DI-349).
(c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(e) Check the DTC (See page DI-349).
OK:
DTC B0105/53 is not output.
HINT:
Codes other than code B0105/53 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK

H01024AB0118AB0119R13006H01077H01202
"u
E1Tc ACC ON
or
DTC B0105/53 DLC1Airbag
Sensor
Assembly P Squib
DI-382
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
538 Author
: Date
:
2001 AVALON (RM808U)
4 Check P squib.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Connect the front passenger airbag assembly connector.
(d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to LOOK, and wait at least for 20
seconds.
(b) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(c) Clear the DTC stored in memory (See page DI-349).
(d) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(e) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(f) Check the DTC (See page DI-349).
OK:
DTC B0105/53 is not output.
HINT:
Codes other than code B0105/53 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.

R14286H02142H02251
P Squib
Airbag
Sensor
Assembly
P +
P-
(-)(+)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-383
539 Author
: Date
:
2001 AVALON (RM808U)
DTC B0106/54 Open in P Squib Circuit
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-3.
DTC B0106/54 is recorded when an open is detected in the P squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0106/54

Open circuit in P+ wire harness or P- wire harness of
squib

P squib malfunction

Airbag sensor assembly malfunction
Front passenger airbag assembly (P squib)

Airbag sensor assembly

Wire harness
WIRING DIAGRAM
See page DI-379.
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-475).
2 Check P squib circuit.
CHECK:
For the connector (on the front passenger airbag assembly
side) between the front passenger airbag assembly and the air-
bag sensor assembly, measure the resistance between P+ and
P-.
OK:
Resistance: Below 1 W
NG Repair or replace harness or connector be-
tween front passenger airbag assembly and air-
bag sensor assembly.
OK
DI4CP-03

H01023
AB0118AB0119R13006H01078 H02144H02253
P Squib
Airbag
Sensor
Assembly
P +
P-ACC
or
DTC B0106/54 DLC1
ON " u
E1
Tc
DI-384
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
540 Author
: Date
:
2001 AVALON (RM808U)
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
(on the front passenger airbag assembly side) between
the front passenger airbag assembly and the airbag sen-
sor assembly.
(c) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
CHECK:
(a) Turn the ignition switch to ACC or ON and wait at least for
20 seconds.
(b) Clear the DTC stored in memory (See page DI-349).
(c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(e) Check the DTC (See page DI-349).
OK:
DTC B0106/54 is not output.
HINT:
Codes other than code B0106/54 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK