Page 1216 of 1897
AB0117H01293H01295
Airbag Sensor Assembly
LOCK
DI-480
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
636 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
Always lights up, when ignition switch is in LOCK position
1 Prepare for inspection (See step 1 on page DI-475).
2 Does SRS warning light turn off?
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Disconnect the airbag sensor assembly connector.
(d) Connect negative (-) terminal cable to the battery.
CHECK:
Check operation of SRS warning light.
NO Check SRS warning light circuit or terminal AB
circuit of DLC1.
YES
Replace airbag sensor assembly.
Page 1217 of 1897
N14677
Fuse
AB0119H01300
H01301
Airbag Sensor Assembly
ON
LA
(+)
(-)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-481
637 Author: Date:
2001 AVALON (RM808U)
Does not light up, when ignition switch is turned to ACC or ON
1 Check ECU-B Fuse.
PREPARATION:
Remove the ECU-B fuse.
CHECK:
Check continuity of the ECU-B fuse.
OK:
Continuity
HINT:
Fuse may be burnt out even if it appears to be OK during
visual inspection.
If fuse is OK, install it.
NG Go to step 5.
OK
2 Prepare for inspection (See step 1 on page DI-475).
3 Check SRS warning light circuit.
PREPARATION:
(a) Connect negative (-) terminal cable to the battery.
(b) Turn the ignition switch to ACC or ON.
CHECK:
Measure the voltage between body ground and LA terminal of
the harness side connector of the airbag sensor assembly.
OK:
Voltage: 10 - 14 V
NG Check SRS warning light bulb or repair SRS
warning light circuit.
OK
Page 1218 of 1897
H08325AB0119H11969H13045
P/T Squib (LH)
Side Airbag
Sensor (LH)
Side Squib (LH)P Squib
D Squib
Spiral
Cable
Front Airbag
Sensor (RH) Front Airbag
Sensor (LH)
P/T Squib (RH)
Side Squib (RH)Side Airbag
Sensor (RH)
ONAirbag
Sensor
Assembly
DI-482
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
638 Author: Date:
2001 AVALON (RM808U)
4 Does SRS warning light come on?
PREPARATION:
(a) Disconnect negative (-) terminal cable from the battery.
(b) Connect the airbag sensor assembly connector.
(c) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
(d) Turn the ignition switch to ACC or ON.
CHECK:
Check operation of the SRS warning light.
NO Check terminal LA of airbag sensor assembly.
If normal, replace airbag sensor assembly.
YES
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use simulation method to check.
Page 1221 of 1897
AB0117AB0118AB0119H11969H13046
LOCK ACC
ON
or
AB0118
R14305AB0119
H00030
ACCON
or
E1
Tc
(+) (-)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-485
641 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
If the DTC is not displayed, do the following troubleshooting.
1 Does SRS warning light light up for approx. 6 seconds?
PREPARATION:
Check operation of the SRS warning light after ignition switch
is turned from LOCK position to ACC or ON position.
NO Check SRS warning light system (See page
DI-479).
YES
2 Check voltage between terminals Tc and E1 of DLC1.
PREPARATION:
Turn the ignition switch to ACC or ON.
CHECK:
Measure the voltage between terminals Tc and E1 of DLC1.
OK:
Voltage: 10 - 14 V
OK Go to step 4.
NG
Page 1222 of 1897
AB0118
R14304AB0119
H00031
ACCON
orTc
(+)
(-)
AB0117 AB0118 AB0119H01302H01303
LOCK
ACCON
or
Airbag Sensor Assembly
Tc
DI-486
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
642 Author: Date:
2001 AVALON (RM808U)
3 Check voltage between terminal Tc of DLC1 and body ground.
CHECK:
Measure the voltage between terminal Tc of DLC1 and body
ground.
OK:
Voltage: 10 - 14 V
OK Check harness between terminal E1 of DLC1
and body ground.
NG
4 Check airbag sensor assembly.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Disconnect the airbag sensor assembly connector.
(d) Insert service wire into terminal Tc from back side as
shown in the illustration.
(e) Connect the airbag sensor assembly connector with ser-
vice wire.
(f) Connect negative (-) terminal cable to the battery.
(g) Turn the ignition switch to ACC or ON and wait at least for
20 seconds.
(h) Connect service wire of terminal Tc to body ground.
CHECK:
Check operation of the SRS warning light.
OK:
SRS waning light comes on.
NOTICE:
Pay due attention to the terminal connecting position to
avoid a malfunction.
OK Check harness between the airbag sensor as-
sembly and DLC1.
NG
Replace airbag sensor assembly.
Page 1223 of 1897
AB0119H01304H01305
LOCKAirbag Sensor Assembly
Tc
(+)
(-)
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-487
643 Author: Date:
2001 AVALON (RM808U)
If the DTC is displayed without a DTC check procedure, perform the following
troubleshooting.
1 Check resistance between terminal Tc of airbag sensor assembly and body
ground.
PREPARATION:
(a) Turn the ignition switch to LOCK.
(b) Disconnect negative (-) terminal cable from the battery,
and wait at least for 90 seconds.
(c) Disconnect the airbag sensor assembly connector.
CHECK:
Check resistance between terminal Tc of the airbag sensor as-
sembly connector and body ground.
OK:
Resistance: 1 MW or Higher
NG Repair or replace harness or connector.
OK
Replace airbag sensor assembly.
Page 1230 of 1897
H11969
DI1MZ-1 1
R13006
DLC1
E1 Tc
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-349
505 Author: Date:
2001 AVALON (RM808U)
PRE-CHECK
1. SRS WARNING LIGHT CHECK
(a) Turn the ignition switch to the ACC or ON position and
check that the SRS warning light lights up.
(b) Check that the SRS warning light goes out after approx.
6 seconds.
HINT:
When the ignition switch is at ACC or ON and the SRS
warning light remains on or flashes, the airbag sensor as-
sembly has detected a malfunction code.
If, after approx. 6 seconds have elapsed, the SRS warn-
ing light sometimes lights up or the SRS warning light
lights up even when the ignition switch is OFF, a short in
the SRS warning light circuit can be considered likely.
Proceed to ºSRS warning light circuit malfunctionº on
page DI-479.
2. DTC CHECK (Using diagnosis check wire)
(a) Present troubles codes:
Output the DTC.
(1) Turn the ignition switch to the ACC or ON position
and wait for approx. 20 seconds.
(2) Using SST, connect terminals Tc and E1 of the
DLC1.
SST 09843-18020
NOTICE:
Pay due attention to the terminal connecting position to
avoid a malfunction.
(b) Past troubles codes:
Output the DTC.
(1) Using service wire, connect terminals Tc and E1 of
the DLC1.
SST 09843-18020
(2) Turn the ignition switch to the ACC or ON position
and wait for approx. 20 seconds.
NOTICE:
Pay due attention to the terminal connecting position to
avoid a malfunction.
Page 1231 of 1897
AT0716AB0056H08231
Normal Code
ON
OFF0.25
0.25
Code 11 and 31
ON
OFF
0.5 2.54.0
1.5 0.5
DTC 11
DTC 31Repeat
F07887
TOYOTA Hand-Held Tester
DLC3
DI-350
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
506 Author: Date:
2001 AVALON (RM808U)
(c) Read the DTC.
Read the 2-digit DTC as indicated by the number of times
the SRS warning light blinks. As an example, the blinking
patterns, normal, 11 and 31 are shown in the illustration.
Normal code indication
The light will blink 2 times per second.
Malfunction code indication
The first blinking output indicates the first digit
of a 2-digit DTC. After a 1.5-second pause,
the second blinking output will indicate the
second digit.
If there are 2 or more codes, there will be a 2.5-second pause
between each code. After all the codes have been output, there
will be a 4.0-second pause and they will all be repeated.
HINT:
In the event of a number of trouble codes, indication will
start from the smallest numbered code.
If a DTC is not output or a DTC is output without terminal
connection, proceed to the Tc terminal circuit inspection
on page DI-484.
3. DTC CHECK (Using TOYOTA hand-held tester)
(a) Hook up the TOYOTA hand-held tester to the DLC3.
(b) Read the DTCs by following the prompts on the tester
screen.
HINT:
Please refer to the TOYOTA hand-held tester operator's manu-
al for further details.
4. DTC CLEARANCE (Not using service wire)
When the ignition switch is turned off, the diagnostic trouble
code is cleared.
HINT:
DTC might not be cleared by turning the ignition switch OFF.
In this case, proceed to the next step.
5. DTC CLEARANCE (Using service wire)
(a) Connect the 2 service wires to terminals Tc and AB of
check connector.
(b) Turn the ignition switch to ACC or ON and wait for approx.
6 seconds.
