1999 TOYOTA AVENSIS warning light

R11910Match marks
IN–10
– INTRODUCTIONFOR ALL OF VEHICLES
(3) Even in cases of a minor collision where the SRS
does not deploy, the steering wheel pad (See Pub.
No. RM599E, page RS–15), front passenger airbag
assembly (See Pub. No. RM599E, page RS–28),
side airbag assemblies (See page RS–11), curtain
shield airbag assemblies (See page RS–25) and
seat belt pretensioners (See Pub. No. RM599E,
page BO–152) should be inspected.
(4) Never use SRS parts from another vehicle. When
replacing parts, replace them with new parts.
(5) Before repairs, remove the airbag sensor if shocks
are likely to be applied to the sensor during repairs.
(6) Never disassemble and repair the airbag sensor as-
sembly, side airbag sensor assembly, steering
wheel pad, front passenger airbag, side airbag or
seat belt pretensioner in order to reuse them.
(7) If the airbag sensor assembly, side airbag sensor
assembly, steering wheel pad, front passenger air-
bag, side airbag or seat belt pretensioner have
been dropped, or if there are cracks, dents or other
defects in the case, bracket or connector, replace
them with new ones.
(8) Do not directly expose the airbag sensor assembly,
side airbag sensor assembly, steering wheel pad,
front passenger airbag, side airbag or seat belt pre-
tensioner to hot air or flames.
(9) Use a volt/ohmmeter with high impedance (10 kΩ/V
minimum) for troubleshooting of the electrical cir-
cuit.
(10) Information labels are attached to the periphery of
the SRS components. Follow the instructions on the
notices.
(11) After work on the supplemental restraint system is
completed, check the SRS warning light (See Pub.
No. RM599E, page DI–152).
(c) SPIRAL CABLE (in Combination Switch)
The steering wheel must be fitted correctly to the steering
column with the spiral cable at the neutral position, other-
wise cable disconnection and other troubles may result.
Refer to Pub. No. RM599E, page SR–18 of this manual
concerning correct steering wheel installation.

IN–26– INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
5. PROBLEM SYMPTOMS TABLE
The suspected circuits or parts for each problem symptom are shown in the table below. Use this table to
troubleshoot the problem when a ”Normal” code is displayed in the diagnostic trouble code check but the
problem is still occurring. Numbers in the table indicate the inspection order in which the circuits or parts
should be checked.
HINT:
When the problem is not detected by the diagnostic system even though the problem symptom is present,
it is considered that the problem is occurring outside the detection range of the diagnostic system, or that
the problem is occurring in a system other than the diagnostic system.
Symptom
Suspect AreaSee page
With the ignition switch in the ACC or ON position, the SRS warning
light sometimes lights up after approx. 6 seconds have elapsed.
SRS warning light is always lit up even when ignition switch is in
the LOCK position
With the ignition switch in the ACC or ON position, the SRS warning
light does not light up.
PROBLEM SYMPTOMS TABLE
DTC is not displayed.
SRS warning light is always lit up at the time of DTC check
procedure.
DTC is displayed without Tc and E1 terminal connection.DI–294 DI–290
 Problem Symptom
Proceed with troubleshooting of each circuit in the table below.
 SRS warning light circuit
(Always lights up when ignition switch is in
LOCK position.)
 SRS warning light circuit
(Dose not light up when ignition switch is turned to
ACC or ON.)
 Tc terminal circuit
DI–288
Circuit Inspection, Inspection Order
Indicates the circuit which needs to be checked for each problem
symptom. Check in the order indicated by the numbers. Page
Indicates the page where the flow chart for each circuit
is located. 
Circuit or Part Name
Indicates the circuit or part which needs to be checked. 







DI694–01
DI–4
– DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code in the table
below (Proceed to the page given for that circuit.).
DTC No.
(See Page)Detection ItemTrouble AreaSRS
Warning Light
81
(DI–8)Short in curtain shield airbag (RH) cir-
cuit (to ground)
Curtain shield airbag (RH) (squib)

Airbag sensor assembly

Wire harness
Blink
82
(DI–12)Short in curtain shield airbag (RH) cir-
cuit circuit (to B+)
Curtain shield airbag (RH) (squib)

Airbag sensor assembly

Wire harness
Blink
83
(DI–15)Short in curtain shield airbag (RH) squib
circuit
Curtain shield airbag (RH) (squib)

Airbag sensor assembly

Wire harness
Blink
84
(DI–18)Open in curtain shield airbag (RH) squib
circuit
Curtain shield airbag (RH) (squib)

Airbag sensor assembly

Wire harness
Blink
85
(DI–21)Short in curtain shield airbag (LH) circuit
(to ground)
Curtain shield airbag (LH) (squib)

Airbag sensor assembly

Wire harness
Blink
86
(DI–25)Short in curtain shield airbag (LH) circuit
circuit (to B+)
Curtain shield airbag (LH) (squib)

Airbag sensor assembly

Wire harness
Blink
87
(DI–28)Short in curtain shield airbag (LH) squib
circuit
Curtain shield airbag (LH) (squib)

Airbag sensor assembly

Wire harness
Blink
88
(DI–31)Open in curtain shield airbag (LH) squib
circuit
Curtain shield airbag (LH) (squib)

Airbag sensor assembly

Wire harness
Blink
HINT:

When the SRS warning light remains lit up and the DTC is the normal code, this means a voltage source
drops.
This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-
age returns to normal, the SRS warning light will automatically go out.

When 2 or more codes are indicated, the codes will be displayed in numeral order starting from the
lowest numbered code.

If a code not listed on the chart is displayed, the airbag sensor assembly is faulty.

DI695–01
H11591
Combination Meter
(Warning Light)Steering Wheel Pad
(with Airbag)
Airbag Sensor Assembly Front Passenger
Airbag Assembly
Side Airbag Assembly
(LH)
Seat Belt
Pretensioner (LH)Side Airbag Assembly (RH)
Seat Belt
Pretensioner (RH)
Front Airbag
Sensor (LH)
Front Airbag Sensor (RH)
Side and Curtain Shield
Airbag Sensor (RH) Side and Curtain Shield
Airbag Sensor (LH)Curtain Shield Airbag
Assembly (LH)Curtain Shield Airbag Assembly (RH)
– DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI–5
PARTS LOCATION

DI696–01
H01357
C6C5C4
A B
1 2 3 4 5 6A BA B
7 8 9 10 11 121 2 3 4 5 6
7 8 9 10 11 12 1 2 3 4 5 6
7 8 9 10 11 12
23 24 25 26 27 2813 14 15 16 17
18 19 20 21 22 DI–6
– DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
TERMINALS OF ECU
No.SymbolTerminal Name
A–Electrical Connector Check Mechanism
B–Electrical Connector Check Mechanism
C4 – 1SFL–Squib (Side, LH)
C4 – 2SFL+Squib (Side, LH)
C4 – 5PL+Squib (Seat Belt Pretensioner, LH)
C4 – 6PL–Squib (Seat Belt Pretensioner, LH)
C4 – 7ESLSide Airbag Sensor (LH)
C4 – 9FSLSide Airbag Sensor (LH)
C4 – 10SSL+Side Airbag Sensor (LH)
C4 – 12VUPLSide Airbag Sensor (LH)
C5 – 3LASRS Warning Light
C5 – 5IG2Power Source (IGN Fuse)
C5 – 6ACCPower Source (CIG Fuse)
C5 – 7ICL+Squib (Curtain Shield Airbag, LH)
C5 – 8ICL–Squib (Curtain Shield Airbag, LH)
C5 – 9SR+Front Airbag Sensor (RH)
C5 – 10P+Squib (Passenger)
C5 – 11P–Squib (Passenger)
C5 – 12SILDiagnosis
C5 – 13D–Squib (Driver)
C5 – 14D+Squib (Driver)
C5 – 15SL+Front Airbag Sensor (LH)
C5 – 16ICR–Squib (Curtain Shield Airbag, RH)
C5 – 17ICR+Squib (Curtain Shield Airbag, RH)
C5 – 19TcDiagnosis

RS0IJ–01
– SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
RS–1
SRS AIRBAG
PRECAUTION
NOTICE:

The AVENSIS / CORONA is equipped with SRS, which comprises a driver airbag, front passen-
ger airbag, side airbag and curtain shield airbag. Failure to carry out service operations in the
correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly lead-
ing to a serious accident. Further, if a mistake is made in servicing the SRS, it is possible that
the SRS may fail to operate when required. Before performing servicing (including removal or
installation of parts, inspection or replacement), be sure to read the following items carefully,
then follow the correct procedures described in the repair manual.

Malfunction symptoms of the SRS are difficult to confirm, so the DTCs become the most impor-
tant source of information when troubleshooting. When troubleshooting the SRS, always in-
spect the DTCs before disconnecting the battery.

Even in cases of a minor collision where the SRS does not deploy, the side airbag assembly,
curtain shileld airbag assembly and side and curtain shield airbag sensor assembly should be
inspected (See page RS–11, RS–25 and RS–36).

Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.

Never disassemble and repair the side airbag assembly, curtain shield airbag assembly or side
and curtain shield airbag sensor assembly in order to reuse it.

If the side airbag assembly, curtain shield airbag assembly or side and curtain shield airbag
sensor assembly has been dropped, or if there are cracks, dents or other defects in the case,
bracket or connector, replace it with new one.

Use a volt/ohmmeter with high impedance (10 kΩ/V minimum) for troubleshooting the system’s
electrical circuits.

Information labels are attached to the periphery of the SRS components. Follow the instruc-
tions on the notices.

After working on the SRS is completed, perform the SRS warning light check (See Pub No.
RM599E on page DI–152).

If the vehicle is equipped with a mobile communication system, refer to the precaution in the
IN section.
CAUTION:

Work must be started 90 seconds after the ignition switch is turned to the ”LOCK” position and
the negative (–) terminal cable is disconnected from the battery.
(The SRS is equipped with a back–up power source so that if work is started within 90 seconds
from disconnecting the negative (–) terminal cable of the battery, the SRS may be deployed.)

When the negative (–) terminal cable is disconnected from the battery, the memory of the clock
and audio system will be canceled. So before starting work, make a record of the contents mem-
orized in the audio memory system. When work is finished, reset the audio systems as they
were before and adjust the clock. To avoid erasing the memory in each memory system, never
use a back– up power supply from outside the vehicle.

Before repairs, remove the airbag sensor if shocks are likely to be applied to the sensor during
repairs.

Do not expose the side airbag assembly, curtain shield airbag assembly or side and curtain
shield airbag sensor assembly directly to hot air or flames.

RS0IK–01
H03384
H11628
H03386
H03387
H03388
RS–2
– SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
OPERATION
1. SIDE AIRBAG ASSEMBLY
The inflater and bag of the SRS side airbag are stored in the
side airbag assembly and cannot be disassembled. The inflater
contains a squib, igniter charge and gas generant, etc., and in-
flates the bag when instructed by the side airbag sensor assem-
bly.
2. CURTAIN SHIELD AIRBAG ASSEMBLY
The inflater and bag of the SRS curtain shield airbag are stored
in the curtain shield airbag assembly and cannot be disas-
sembled. The inflater contains a squib, igniter charge and gas
generant, etc., and inflates the bag when instructed by the side
airbag sensor assembly.
3. SRS WARNING LIGHT
The SRS warning light is located on the combination meter. It
goes on to alert the driver of trouble in the system when a mal-
function is detected in the airbag sensor assembly. In normal
operation conditions when the ignition switch is turned to the
ACC or ON position, the light goes on for about 6 seconds and
then goes off.
4. AIRBAG SENSOR ASSEMBLY
The airbag sensor assembly is mounted on the floor inside the
lower center finish panel. The airbag sensor assembly consists
of an airbag sensor, safing sensor, diagnosis circuit ignition
control and drive circuit, etc. It receives signals from the airbag
sensor, front airbag sensor, side airbag sensor and judges
whether the SRS must be activated or not.
5. SIDE AND CURTAIN SHIELD AIRBAG SENSOR AS-
SEMBLY
The side and curtain shield airbag sensor assembly is mounted
in the LH and RH center pillars. The side airbag sensor assem-
bly consists of a side airbag, sensor, safing sensor and diagno-
sis circuit, etc. It sends signals to the airbag sensor assembly
to judges whether the SRS side airbag must be activated or not.

Z05953
Spacer
Housing
Female Male
R10587
When Connector is Connected When Connector is Disconnected
Short Spring Plate
Housing
Housing
Terminal
ConnectorsShort Spring PlateSquib
Squib Short Spring Plate ONContacting Male Terminal Short Spring Plate
Closed Circuit
R12076Airbag Sensor AssemblyDisconnection
Detection
PinSRS
Warning
Light RS–4
– SUPPLEMENTAL RESTRAINT SYSTEMSRS AIRBAG
(1) Terminal Twin–Lock Mechanism
Each connector has a two–piece component con-
sisting of a housing and a spacer. This design en-
ables the terminal to be locked securely by two lock-
ing devices (the retainer and the lance) to prevent
terminals from coming out.
(2) Airbag Activation Prevention Mechanism
Each connector contains a short spring plate. When
the connector is disconnected, the short spring
plate automatically connects positive (+) terminal
and negative (–) terminal of the squib.
HINT:
The type of connector is shown in the diagram on the previous
page.
(3) Electrical Connection Check Mechanism
This mechanism electrically checks that connectors
are connected correctly and completely. The electri-
cal connection check mechanism is designed so
that the disconnection detection pin connects with
the diagnosis terminals when the connector hous-
ing lock is locked.