2001 TOYOTA AVALON Service Repair Manual

H01016AB0119
H08394H08269
Airbag
Sensor
Assembly P/T Squib (LH)
PL+
(-) (+) ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-441
597 Author
: Date
:
2001 AVALON (RM808U)
DTC B0138/72 Short in P/T Squib (LH) Circuit (to B+)
CIRCUIT DESCRIPTION
The P/T squib (LH) circuit consists of the airbag sensor assembly and seat belt pretensioner (LH).
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 B0138/72 is recorded when a B+ short is detected in the P/T squib (LH) circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0138/72

Short circuit in seat belt pretensioner (LH) wire harness
(to B+)

P/T squib (LH) malfunction

Airbag sensor assembly malfunction
Seat belt pretensioner (LH)

Airbag sensor assembly

Wire harness
WIRING DIAGRAM
See page DI-431.
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-475).
2 Check P/T squib (LH) circuit.
CHECK:
(a) Turn the ignition switch to ON.
(b) For the connector (on the seat belt pretensioner side) be-
tween the seat belt pretensioner (LH) and the airbag sen-
sor assembly, measure the voltage between PL+ and
body ground.
OK:
Voltage: 0 V
NG Repair or replace harness or connector be-
tween seat belt pretensioner (LH) and airbag
sensor assembly.
OK
DI4D7-02

H01017H02139AB0118AB0119R13006H01085H02217
P/T Squib (LH)
Airbag
Sensor
Assembly
PL+
PL-
ACC
or
DTC B0138/72ON " u
E1
Tc DLC1
DI-442
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
598 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 PL+ and PL- of the connec-
tor (on the seat belt pretensioner side) between the seat
belt pretensioner (LH) and the airbag sensor 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 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 B0138/72 is not output.
HINT:
Codes other than code B0138/72 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK

AB0118
R13006AB0119H01018
H01085H01222
"u
E1TcACC ON
or Airbag
Sensor
Assembly P/T Squib (LH)
DTC B0138/72 DLC1
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-443
599 Author
: Date
:
2001 AVALON (RM808U)
4 Check P/T squib (LH).
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 seat belt pretensioner (LH) 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 B0138/72 is not output.
HINT:
Codes other than code B0138/72 may be output at this time, but
they are not relevant to this check.
NG Replace seat belt pretensioner (LH).
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.

AB0119H01298H01299
(-) (+)ONAirbag Sensor Assembly
ACC
IG2
DI-444
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
600 Author
: Date
:
2001 AVALON (RM808U)
DTC B1100/31 Airbag Sensor Assembly Malfunction
CIRCUIT DESCRIPTION
The airbag sensor assembly consists of a airbag sensor, safing sensor, drive circuit, diagnosis circuit and
ignition control, etc.
It receives signals from the airbag sensor, judges whether or not the SRS must be activated, and detects
diagnosis system malfunction.
DTC B1100/31 is recorded when occurrence of a malfunction in the airbag sensor assembly is detected.
DTC No.DTC Detecting ConditionTrouble Area
B1100/31
Airbag sensor assembly malfunction
Airbag sensor assembly
INSPECTION PROCEDURE
HINT:
When a malfunction code other than code B1100/31 is displayed at the same time, first repair the malfunction
indicated by the malfunction code other than code B1100/31.
1 Prepare for inspection (See step 1 on page DI-475).
2 Check voltage at IG2 and ACC of airbag sensor assembly.
CHECK:
(a) Turn the ignition switch to ON.
(b) Measure the voltage between body ground and each of
terminals IG2 and ACC of the airbag sensor assembly
connector.
OK:
Voltage: 10 - 14 V
NG Check that an abnormality occurs on the battery
and charging system.
OK
DI4D8-02

AB0118
R13006AB0119
FI1394
H00022
ACCON
or
E1
TcDTC B1100/31 DLC1
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-445
601 Author
: Date
:
2001 AVALON (RM808U)
3 Is DTC B1100/31 output again?
PREPARATION:
Clear the DTC (See step 5 on page DI-349).
CHECK:
(a) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(b) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
(c) Repeat operation in step (a) and (b) at least 5 times.
(d) Check the DTC (See page DI-349).
HINT:
Codes other than code B1100/31 may be output at this time, but
they are not relevant to this check.
NO Using simulation method, reproduce malfunc-
tion symptoms (See page IN-20).
YES
Replace airbag sensor assembly.

H01450
Side Airbag Sensor Assembly (RH)
Airbag Sensor Assembly
GR
LG
L-Y
P ESR
SSR+
VUPR4
3
2
1C77
9
10
12ESR
SSR-
SSR+
VUPR C7
C7
C7 SSR- DI-446
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
602 Author
: Date
:
DTC B1140/32 Side Airbag Sensor Assembly (RH)
Malfunction
CIRCUIT DESCRIPTION
The side airbag sensor assembly (RH) consists of the safing sensor, diagnosis circuit and lateral decelera-
tion sensor, etc.
It receives signals from the lateral deceleration sensor, judges whether or not the SRS must be activated,
and detects diagnosis system malfunction.
DTC B1140/32 is recorded when occurrence of a malfunction in the side airbag sensor assembly (RH) is
detected.
DTC No.DTC Detecting ConditionTrouble Area
B1140/32
Side airbag sensor assembly (RH) malfunction

Side airbag sensor assembly (RH)

Airbag sensor assembly

Wire harness
WIRING DIAGRAM
DI6N0-01

R13006H09528AB0118AB0119H09527
ACC
ON
or
E1
TcDTC B1140/32
DLC1
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-447
603 Author
: Date
:
INSPECTION PROCEDURE
1 Is DTC B1140/32 out put?
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).
HINT:
Codes other than code B1140/32 may be output at this time, but
they are not relevant to this check.
NO The malfunctioning part can now be considered
normal. To make sure of this, use the simulation
method to check.
YES
2 Is connector of side airbag sensor assembly (RH) properly connected?
3 Prepare for inspection (See step 1 on DI-475).

H01015H01058 H01036H01160
Airbag
Sensor
Assembly
(-)(+) Side Airbag Sensor
Assembly (RH)
SSR+ Airbag Sensor
Assembly
ESR SSR+
ESRu "
DI-448
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
604 Author
: Date
:
4 Check wire harness.
PREPARATION:
(a) Disconnect the side airbag sensor assembly (RH) con-
nector.
(b) Using a service wire, connect SSR+ and ESR of the con-
nector (on the side airbag sensor assembly side) between
the side airbag sensor assembly (RH) and airbag sensor
assembly.
CHECK:
For the connector (on the airbag sensor assembly side) be-
tween the side airbag sensor assembly (RH) and the airbag
sensor assembly, measure the resistance between SSR+ and
ESR.
OK:
Resistance: Below 1 W
NG Repair or replace harness or connector be-
tween side airbag sensor assembly (RH) and
airbag sensor assembly.
OK