TOYOTA SEQUOIA 2001 Service Repair Manual

H23984
6 seconds
Ignition Switch
SRS Warning
Light (*1)
SRS Warning
Light (*2)
*1: SRS airbag system is normal
*2: SRS airbag system has trouble ON
OFF
ON
OFF
ON
OFF
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1139
1333 Author: Date:
2005 SEQUOIA (RM1146U)
3. FUNCTION OF SRS WARNING LIGHT
(a) Primary check.
Turn the ignition switch to the LOCK position. Wait for at least 2 seconds, then turn the ignition switch
to the ON position. The SRS warning light comes on for approximately 6 seconds and the SRS airbag
system diagnosis (including the seat belt pretensioner and occupant classification system) is per-
formed.
HINT:
If trouble is detected during the primary check, the SRS warning light remains on even after the primary
check period (for approximately 6 seconds) has elapsed.
(b) Constant check.
After the primary check, the airbag sensor assembly constantly monitors the SRS airbag system for
trouble.
HINT:
If trouble is detected during the constant check, the airbag sensor assembly functions as follows:

The SRS warning light comes on.

The SRS warning light goes off, and then comes on. This blinking pattern indicates the source voltage
drop. The SRS warning light goes off 10 seconds after the source voltage returns to normal.

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

H22552
Ignition SwitchON
OFF
Passenger Airbag
ON/OFF Indicator
(ºONº)ON
OFF
ON
OFF4 sec.
ON/OFF condition depends on the
front passenger detection results. 2 sec.
4 sec. 2 sec.
Passenger Airbag
ON/OFF Indicator
(ºOFFº)
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1141
1335 Author: Date:
2005 SEQUOIA (RM1146U)
HINT:

The passenger airbag ON/OFF indicator comes on or goes off based on the timing chart below in order
to check the indicator light circuit.

When the occupant classification system has trouble, both the SRS warning light and the passenger
airbag ON/OFF indicator (ºOFFº) comes on. In this case, check the DTCs in the supplemental restraint
system first. Then troubleshoot the occupant classification system if DTC B1650/32 is indicated, and
troubleshoot the passenger airbag ON/OFF indicator if DTC B1660/43 is detected.

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.

H24029
Curtain Shield Airbag
Sensor Assembly RH
(*1)
Side Airbag Sensor
Assembly RH (*1)
Front Airbag
Sensor RH
RSCA OFF Switch
(*1)
Airbag Sensor
Assembly
Front Airbag
Sensor LH
Side Airbag Sensor
Assembly LH (*1)
Curtain Shield AIrbag
Sensor Assembly LH
(*1)Spiral CableTo
Occupant
Classification ECU
Front Seat Outer
Belt RH
(P/T Squib RH)
Side Airbag
Assembly RH
(Side Squib RH) (*1)
Front Passenger
Airbag Assembly
(P Squib)
Integration Control
and Panel
(Passenger Airbag
ON/OFF Indicator)
Combination Meter
(SRS Warning Light/
RSCA OFF Indicator
(*1))
Steering Wheel
Pad (D Squib)
Side Airbag
Assembly LH
(Side Squib LH) (*1)
Curtain Shield Airbag
Assembly LH (Curtain
Shield Airbag LH
Squib) (*1)
Front Seat Outer
Belt LH
(P/T Squib LH)
Seat Position AIrbag
Sensor Assembly/
Front Seat Inner Belt LH
(Buckle Switch LH)Curtain Shield Airbag
Assembly RH
(Curtain Shield Airbag
RH Squib) (*1)
9 13
10 14
11
1512
16 15
2 6
37
4 8
25 29
26 30
27 33
28 34
1721
1822
19 23
2024
3
4
7
89
10
13
14 11
1227
28
29
30 31
32
31
32 DI±1144
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1338 Author: Date:
2005 SEQUOIA (RM1146U)

H23825
Occupant
Classification ECUFront Seat Inner
Belt RH
(Buckle Switch RH)
Occupant
Classification
Sensor Front LH
Occupant
Classification
Sensor Front RH
Occupant
Classification
Sensor Rear LH
Occupant
Classification
Sensor Rear RH 35
36
37
3839
40
41
42
40
41
40
41
40
41 From
Airbag Sensor Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1145
1339 Author: Date:
2005 SEQUOIA (RM1146U)

H24030
Airbag Sensor Assembly Connector
24 4
Short SpringShort Spring Short Spring
Before Release
After Release
Short Spring
Paper
Short Spring
Paper
Connector18
Short SpringShort SpringShort Spring
PaperPaper
Before Release After Release
Connector26
Short Spring
Short SpringShort Spring
PaperPaperBefore Release After Release
Connector28
Short Spring
Before Release After Release
Short Spring
Short SpringPaperPaper
DI±1146
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1340 Author: Date:
2005 SEQUOIA (RM1146U)

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.

DI±1148
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1342 Author: Date:
2005 SEQUOIA (RM1146U)
2. CLEAR DTC (Using SST service wire)
Clear the DTCs.
(1) When the ignition switch is turned off, the DTCs are
cleared.
HINT:
Some DTC may not be cleared by turning off the ignition switch.
In this case, proceed to the next procedure.
(2) Using SST, connect terminals TC and CG of the
DLC3, and then turn the ignition switch to the ON
position.
SST 09843±18040
(3) Disconnect terminal TC of the DLC3 within 3 to 10
seconds after the DTCs are output, and check if the
SRS warning light comes on after 3 seconds of dis-
connecting.
(4) Within 2 to 4 seconds after the SRS warning light
comes on, connect terminals TC and CG of the
DLC3.
(5) The SRS warning light should go off within 2 to 4 se-
conds after connecting terminals TC and CG of the
DLC3. Then, disconnect terminal TC within 2 to 4
seconds after the SRS warning light goes off.
(6) The SRS warning light comes on again within 2 to
4 seconds after disconnecting terminal TC. Then,
reconnect terminals TC and CG within 2 to 4 se-
conds after the SRS warning light comes on.