2001 TOYOTA SEQUOIA Page 18

DI6OW±27
Warning Light Check
P. DI±1147
END
P. DI±1127
P. DI±1137
DTC Check (Read Past DTC)
Symptom Simulation
Normal
System Code
DTC Check
Warning Light ON
Trouble
Code
Warning Light
Remains OFF
Circuit Inspection
Identification of Problem
Repair
Warning Light Check
DTC Check (Read Past DTC)
Confirmation Test
Remains ON
Remains OFF
Clear DTCItem inside are titles of pages in this manual,
with the page number in the bottom portion. See the
pages for detailed explanations.
1
24
3
57
89
10
DTC Chart
DTC Chart6
11
12P. DI±1155
P. IN±35
P. DI±1161 ± DI±1498
Remains OFF
Remains ON
Vehicle Brought to Workshop
Customer Problem Analysis
DTC Check (Read Present DTC)
P. DI±1155P. DI±1147
P. DI±1147
P. DI±1147
P. DI±1137
P. DI±1147
Step 3, 4, 8, 9, 10, 12: Diagnostic steps permitting the use
of the hand±held tester. DI±1126
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1320 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING

DIDGK±01
A08841
Hand±held Tester
DLC3
DI±1128
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1322 Author: Date:
2005 SEQUOIA (RM1146U)
INITIALIZATION
ZERO POINT CALIBRATION AND SENSITIVITY CHECK
NOTICE:
Make sure that the seat is not occupied before performing
the operation.
HINT:
Perform the zero point calibration and sensitivity check if any of
the following conditions occur.

The occupant classification ECU is replaced.

Accessories (seatback tray and seat cover, etc.) are
installed.

The passenger seat is removed from the vehicle.

The passenger airbag ON/OFF indicator (ºOFFº) comes
on when the passenger seat is not occupied.

The vehicle is brought to the workshop for repair due to
an accident or a collision.
Zero point calibration and sensitivity check procedures.
HINT:
Make sure that zero point calibration has finished normally, and
then perform the sensitivity check.
(1) Adjust the seat position according to the table be-
low.
Adjustment ComponentPosition
Slide DirectionRearmost position
Reclining AngleUpright position
Headrest HeightLowest position
Lifter HeightLowest position
(2) Connect the hand±held tester to the DLC3.
(3) Turn the ignition switch to the ON position.
(4) Perform the zero point calibration by following the
prompts on the tester screen shown in 2 pages lat-
er.
HINT:
Refer to the hand±held tester operator's manual for further de-
tails.
OK:
The ºCOMPLETEº is displayed.

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1129
1323 Author: Date:
2005 SEQUOIA (RM1146U)
(5) Perform the sensitivity check by following the
prompts on the tester screen shown in 2 pages lat-
er.
(6) Confirm that the beginning sensor reading is within
the standard value.
OK:
Standard value: ±3.2 to 3.2 kg (±7 to 7 lb)
(7) Place a 30 kg (66.14 lb) weight (eg. a 30 kg (66.14
lb) of lead mass) onto the passenger seat.
(8) Confirm that the sensitivity is within the standard
value.
OK:
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
HINT:

When performing the sensitivity check, use a solid metal
weight (the check result may not appear properly if the
weight made from liquid is used).

When the sensitivity deviates from the standard value, re-
tighten the bolts of the passenger seat taking care not to
deform the seat rail. After performing this procedure, if the
sensitivity is not within the standard value, replace the
front seat assembly RH.

When zero point calibration has not finished normally, re-
place the front seat assembly RH.

DI6P2±15
DI±1132
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1326 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
SymptomSuspected AreaSee page

The front passenger seat condition differs from the indication by
the passenger airbag ON/OFF indicator (DTC is not output).
Trouble in indication of Passenger airbag ON/OFF indica-
torDI±1485

With the ignition switch is in ON position, the SRS warning light
sometimes comes on after approximately 6 seconds.
SRS warning light circuit (Always comes on, when DTC is
not output)DI±1491

The SRS warning light always comes on even when DTC is not
output.
SRS warning light circuit (Always comes on, when DTC is
not output)DI±1491

With the ignition switch is in the ON position, the SRS warning
light does not come on.
SRS warning light circuit (Does not come on, when igni-
tion switch is turned to the ON position)DI±1496

Although an SRS warning light operates normally, DTC or a
normal system code is not display.
TC terminal circuitDI±1498

Although terminals TC and CG of DLC3 are not connected, DTC
or a normal system code is display.
TC terminal circuitDI±1498

DI±1140
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1334 Author: Date:
2005 SEQUOIA (RM1146U)
(c) Review.
(1) When the SRS airbag system is normal:
The SRS warning light comes on only during the primary check period (for approximately 6 se-
conds after the ignition switch is turned to the ON position).
(2) When the SRS airbag system has trouble:

The SRS warning light remains on even after the primary check period has elapsed.

The SRS warning light goes off after the primary check, but comes on again during the
constant check.

The SRS warning light does not come on when turning the ignition switch from the LOCK
to ON position.
HINT:
The airbag sensor assembly keeps the SRS warning light on if the airbag has been deployed.
4. FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR
The passenger airbag ON/OFF indicator function as follows:
(1) Turn the ignition switch to the ON position.
(2) The passenger airbag ON/OFF indicator (ºONº and ºOFFº) comes on for approximately 4 se-
conds, then goes off for approximately 2 seconds.
(3) Approximately 6 seconds after the ignition switch is turned to the ON position, the passenger
airbag ON/OFF indicator will be ON/OFF depending on the conditions listed below.
HINT:
If the front passenger seat condition and the indication by the passenger airbag ON/OFF indicator differ from
those shown in the table below, and the SRS warning light is off, then the DTC is not output. If this occurs,
perform troubleshooting of ºTrouble in indication of Passenger airbag ON/OFF indicatorº (see page
DI±1485).
ConditionºONº indicatorºOFFº indicator
VacantOFFOFF
Adult is seated.ONOFF
Child is seated.OFFON
Child restraint system (CRS) is set.OFFON
Occupant classification system failureOFFON

H24658
Ignition SwitchON
OFF
RSCA OFF SwitchOFF
ON
RSCA OFF IndicatorON
OFFApprox.
3 secondsApprox.
2 secondsApprox.
2 seconds
Bulb Check
(SW input signal prohibited)
Approx.
0.2 secondsApprox.
0.2 seconds
H23823
DI±1142
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1336 Author: Date:
2005 SEQUOIA (RM1146U)
5. FUNCTION RSCA OFF INDICATOR
(a) The RSCA OFF indicator comes on for approximately 3 seconds after the ignition switch is turned ON,
then goes off.
(b) Approximately 3 seconds after the turning the ignition switch ON, the RSCA OFF indicator comes on
or goes off every time it detects OFF (press the switch for approximately 0.2 seconds) or ON (press
the switch for approximately 2 seconds).
HINT:
The RSCA OFF switch is reset by turning the ignition switch to the LOCK position.
As a result, the RSCA OFF switch and RSCA OFF indicator are off when the ignition switch is turned to the
ON position.
6. CHECK SRS WARNING LIGHT
(a) Turn the ignition switch to the ON position, and check that
the SRS warning light comes on for approximately 6 se-
conds (primary check).
(b) Check that the SRS warning light goes off approximately
6 seconds after the ignition switch is turned to the ON
position (constant check).
HINT:
When any of the following symptoms occur, refer to the ºProb-
lem Symptoms Tableº (see page DI±1132).

The ignition switch is turned from the LOCK to ON posi-
tion, but the SRS warning light does not come on.

The SRS warning light comes on occasionally after the
primary check period has elapsed.

The SRS warning light comes on, but DTC is not output.

H24023
H24021
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1143
1337 Author: Date:
2005 SEQUOIA (RM1146U)
7. CHECK PASSENGER AIRBAG ON/OFF INDICATOR
(a) Turn the ignition switch to the ON position.
(b) Check that the passenger airbag ON/OFF indicator (ºONº
and ºOFFº) comes on for approximately 4 seconds, then
goes off for approximately 2 seconds.
HINT:
Refer to the table in step 4 regarding the passenger airbag ON/
OFF indicator when the ignition switch is turned to the ON posi-
tion and approximately 6 seconds pass.
8. CHECK RSCA OFF INDICATOR
(a) Check that the RSCA OFF indicator is off when turning
the ignition switch to the ON position.
(b) Check that the RSCA OFF indicator comes on when turn-
ing the RSCA OFF switch on (press the switch for approxi-
mately 2 seconds) with the ignition switch on.
(c) Turn the ignition switch to the LOCK position with the
RSCA OFF indicator is on, and then turn the ignition
switch to the ON position. Check that the RSCA OFF indi-
cator is off.
9. RELEASE METHOD OF ACTIVATION PREVENTION MECHANISM
The activation prevention mechanism is built into the connector for the squib circuit of the SRS.
As explained in the troubleshooting section, insert a piece of paper that is the same thickness as the male
terminal between the terminal and the short spring to release it (Refer to the illustrations on the next 3 pages).
CAUTION:
Never release the activation prevention mechanism on the squib connector even when inspecting
with the squib disconnected.
NOTICE:

Do not release the activation prevention mechanism unless specially directed by the trouble-
shooting procedure.

To prevent the terminal and the short spring from being damaged, always use a piece of paper
that is the same thickness as the male terminal.

DIDGN±01
H10658
DLC3
TC CG
H13050
0.5
2.5 4.0
1.50.5
DTC 11
DTC 31Repeat 0.75
ON
OFF0.25 0.25
ON
OFF
0.25 Normal System Code
(w/o Past Trouble Code)
Normal System Code
(w/ Past Trouble Code)
Trouble Code
(Example Codes 11 and 31)
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1147
1341 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. CHECK DTC (Using SST check wire)
(a) Check the DTCs (Present trouble code).
(1) Turn the ignition switch to the ON position, and wait
for approximately 60 seconds.
(2) Using SST, connect terminals TC and CG of the
DLC3.
SST 09843±18040
NOTICE:
Connect the terminals to the correct positions to avoid a
malfunction.
(b) Check the DTCs (Past trouble code).
(1) Using SST, connect terminals TC and CG of the
DLC3.
SST 09843±18040
NOTICE:
Connect the terminals to the correct positions to avoid a
malfunction.
(2) Turn the ignition switch to the ON position, and wait
for approximately 60 seconds.
(c) Read the DTCs.
Read the blinking patterns of the DTCs. As examples, the
blinking patterns for trouble codes 11 and 31 are shown
in the illustration to the left.

Normal system code (w/o past trouble code)
The light blinks twice per second.

Normal system code (w/ past trouble code)
When the past trouble code is stored in the
airbag sensor assy center, the light blinks
only once per second.

Trouble code
The first blinking indicates the first DTC. The
second blinking occurs after a 1.5±second
pause.
If there are more than 1 code, there will be a 2.5±second pause
between each code. After all codes are shown, there will be a
4.0±second pause, and they all will be repeated.
HINT:

If 2 or more malfunctions are found, the indication begins
with the smallest numbered code.

If DTCs are indicated without connecting the terminals,
proceed to the ºTC terminal circuitº on page DI±1498.