1999 TOYOTA AVENSIS 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.

V07268
VIBRATION METHOD: When vibration seems to be the major cause.
CONNECTORS
WIRE HARNESS
PARTS AND SENSOR1
Slightly shake the connector vertically and horizontally.
Slightly shake the wire harness vertically and horizontally.
The connector joint, fulcrum of the vibration, and body
through portion are the major areas to be checked thorough-
ly.
Apply slight vibration with a finger to the part of the sensor
considered to be the problem cause and check that the mal-
function occurs.Shake Slightly
Swing Slightly
Vibrate Slightly
HINT:
Applying strong vibration to relays may result in open relays.
– INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN–23
3. SYMPTOM SIMULATION
The most difficult case in troubleshooting is when there are no problem symptoms occurring. In such cases,
a thorough customer problem analysis must be carried out, then simulate the same or similar conditions and
environment in which the problem occurred in the customer’s vehicle. No matter how much experience a
technician has, or how skilled he or she may be, if he or she proceeds to troubleshoot without confirming
the problem symptoms he or she will tend to overlook something important in the repair operation and make
a wrong guess somewhere, which will only lead to a standstill. For example, for a problem which only occurs
when the engine is cold, or for a problem which occurs due to vibration caused by the road during driving,
etc., the problem can never be determined so long as the symptoms are confirmed with the engine hot condi-
tion or the vehicle at a standstill. Since vibration, heat or water penetration (moisture) is likely cause for prob-
lem which is difficult to reproduce, the symptom simulation tests introduced here are effective measures in
that the external causes are applied to the vehicle in a stopped condition.
Important Points in the Symptom Simulation Test:
In the symptom simulation test, the problem symptoms should of course be confirmed, but the problem area
or parts must also be found out. To do this, narrow down the possible problem circuits according to the symp-
toms before starting this test and connect a tester beforehand. After that, carry out the symptom simulation
test, judging whether the circuit being tested is defective or normal and also confirming the problem symp-
toms at the same time. Refer to the problem symptoms table for each system to narrow down the possible
causes of the symptom.


B02390
HEAT METHOD: When the problem seems to occur when the suspect area is heated. 2
NOTICE:3 WATER SPRINKLING METHOD:
(1)
(2)
4 OTHER: When a malfunction seems to occur when electrical load is excessive.When the malfunction seems to occur on a rainy day or in a
high–humidity condition. Heat the component that is the likely cause of the malfunction
with a hair dryer or similar object. Check to see if the malfunction
occurs.
Sprinkle water onto the vehicle and check to see if the malfunc-
tion occurs.
Turn on all electrical loads including the heater blower, head
lights, rear window defogger, etc. and check to see if the mal-
function occurs.ON HINT:
If a vehicle is subject to water leakage, the leaked water may
contaminate the ECU. When testing a vehicle with a water leak-
age problem, special caution must be taken.
Malfunc-
tion
Do not heat to more than 60 C (140 F). (Temperature
is limited not to damage the components.)
Do not apply heat directly to parts in the ECU. (1)
(2)
Never sprinkle water directly into the engine compart-
ment, but indirectly change the temperature and hu-
midity by applying water spray onto the radiator front
surface.
Never apply water directly onto the electronic compo-
nents. NOTICE: IN–24
– INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS

Detection Item DTC No.
(See page)Trouble AreaSRS
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).
Warming Light
ON
ON
ON
ON
ON
ON
ON
DTC No.
Indicates the diagnostic trouble code.
Page or Instructions
Indicates the page where the inspection procedure
for each circuit is to be found, or gives instructions
for checking and repairs. 

Detection Item
Indicates the system of the problem or
contents of the problem. Trouble Area
Indicates the suspect area of the
problem. 
11
(DI–165)
12
(DI–170)
13
(DI–174)
14
(DI–178)
15
(DI–178)
16
airbag sensor assembly malfunction Front airbag sensor assembly (RH)
malfunction Short in D squib circuit (to ground)
Short in D squib circuit (to B)
Short in D squib circuit
Open in D squib circuit
Front airbag sensor assembly (LH)
malfunction Steering wheel pad (squib)
 Spiral cable
 Airbag sensor assembly
 Wire harness
 Front airbag sensor assembly (RH)
 Wire harness
 Front airbag sensor assembly (LH)
 Wire harness  Steering wheel pad (squib)
 Spiral cable
 Airbag sensor assembly
 Wire harness
 Steering wheel pad (squib)
 Spiral cable
 Airbag sensor assembly
 Wire harness
 Steering wheel pad (squib)
 Spiral cable
 Airbag sensor assembly
 Wire harness
Airbag sensor assembly
 Front passenger airbag sensor assembly (squib)
 Airbag sensor assembly Short in P squib circuit (to ground)ON
– INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN–25
4. DIAGNOSTIC TROUBLE CODE CHART
The inspection procedure is shown in the table below. This table permits efficient and accurate troubleshoot-
ing using the diagnostic trouble codes displayed in the diagnostic trouble code check. Proceed with trouble-
shooting in accordance with the inspection procedure given in the diagnostic chart corresponding to the
diagnostic trouble codes displayed. The Supplemental Restraint System diagnostic trouble code chart is
shown below as an example.

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. 









B02407
WIRING DIAGRAM
DTC 13 Short in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each components,see OPERATION on page RS–2.
DTC 13 is recorded when a short is detected in the D squib circuit.
DTC No.DTC Detecting Condition
Trouble Area
Short circuit between D wire harness and D wire harness of squib
D squib malfunction
Spiral cable malfunction
Airbag sensor assembly malfunctionSteering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
 Diagnostic Trouble Code No. and Detection Item
Circuit Description
The major role and operation, etc. of the circuit
and its component parts are explained. 
Indicates the diagnostic trouble code, diagnostic
trouble code set parameter and suspect area of
the problem. 
Wiring Diagram
This shows a wiring diagram of the circuit.
Use this diagram together with ELECTRICAL
WIRING DIAGRAM to thoroughly understand the
circuit.
Wire colors are indicated by an alphabetical code.
B = Black, L = Blue, R = Red, BR = Brown,
LG = Light Green, V = Violet, G = Green,
O = Orange, W = White, GR = Gray, P = Pink,
Y = Yellow
The first letter indicates the basic wire color and
the second letter indicates the color of the stripe. 
Spiral
Cable
G–R
G–Y 1
27
6D+
D–
A15
A15
D SquibAirbag Sensor
Assembly
13
– INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMSIN–27
6. CIRCUIT INSPECTION
How to read and use each page is shown below.

FI7187
IN0379
Sensor Side
ECU Side
IN0378
Sensor SideECU Side
IN0380
Sensor SideECU Side
IN0381
Pull Lightly
Looseness of Crimping
IN–30– INTRODUCTIONHOW TO TROUBLESHOOT ECU CONTROLLED
SYSTEMS
2. CONNECTOR HANDLING
When inserting tester probes into a connector, insert them from
the rear of the connector. When necessary, use mini test leads.
For water resistant connectors which cannot be accessed from
behind, take good care not to deform the connector terminals.
3. CONTINUITY CHECK (OPEN CIRCUIT CHECK)
(a) Disconnect the connectors at both ECU and sensor
sides.
(b) Measure the resistance between the applicable terminals
of the connectors.
Resistance: 1 Ω or less
HINT:
Measure the resistance while lightly shaking the wire harness
vertically and horizontally.
4. RESISTANCE CHECK (SHORT CIRCUIT CHECK)
(a) Disconnect the connectors on both ends.
(b) Measure the resistance between the applicable terminals
of the connectors and body ground. Be sure to carry out
this check on the connectors on both ends.
Resistance: 1 MΩ or higher
HINT:
Measure the resistance while lightly shaking the wire harness
vertically and horizontally.
5. VISUAL CHECK AND CONTACT PRESSURE CHECK
(a) Disconnect the connectors at both ends.
(b) Check for rust or foreign material, etc. in the terminals of
the connectors.
(c) Check crimped portions for looseness or damage and
check that the terminals are secured in lock portion.
HINT:
The terminals should not come out when pulled lightly from the
back.

– INTRODUCTIONTERMS
IN–35
FFFront–Engine Front–Wheel–Drive
FIPGFormed In Place Gasket
FLFusible Link
FrFront
FRFront–Engine Rear–Wheel–Drive
FWDFront–Wheel–Drive
GNDGround
H/BHatchback
HIHigh
HIDHigh Intensity Discharge (Head Lamp)
HTHard Top
HWSHeated Windshield System
IACIdle Air Control
IFSIndependent Front Suspension
IGIgnition
INTIntermittent
I/PInstrument Panel
IRSIndependent Rear Suspension
J/BJunction Block
J/CJunction Connector
LANLocal Area Network
LBLiftback
LCDLiquid Crystal Display
LEDLight Emitting Diode
LHLeft–Hand
LHDLeft–Hand Drive
LOLow
LSDLimited Slip Differential
LSP & PVLoad Sensing Proportioning And Bypass Valve
LSPVLoad Sensing Proportioning Valve
MAPManifold Absolute Pressure
MAX.Maximum
MICMicrophone
MILMalfunction Indicator Lamp
MIN.Minimum
MPMultipurpose
MPIMultipoint Electronic Fuel Injection
MPXMultiplex Communication System
M/TManual Transmission
NNeutral
No.Number
O2SOxygen Sensor
O/DOverdrive
OPTOption
P & BVProportioning And Bypass Valve
PCSPower Control System