2001 TOYOTA SEQUOIA warning

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.

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)

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.

H13049
Ignition
Switch
DLC3
SRS Warning
Light (*)
OFFON
OFFON Open
Short
T1 T4T6
T2T5 T7 0.5 sec.
T1: 0 to 8 second
T2: approx. 6 seconds
T3: 3 to 5 seconds
T4: 3 to 10 seconds
T5: 2 to 4 seconds
T6: 1 to 5 seconds
T7: within 1 secondT31.5 sec.0.25 sec.
T6 T5
T6 T5 T5
0.25 sec.
*: The past trouble code in the illustration shows DTC 21 as an example.0.5 sec. TC
CG
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1149
1343 Author: Date:
2005 SEQUOIA (RM1146U)
(7) Check if the SRS warning light goes off 2 to 4 se-
conds after connecting terminals TC and CG of the
DLC3. Also check if the normal system code is out-
put within 1 second after the SRS warning light goes
off.
If DTCs are not cleared, repeat this procedure until the codes
are cleared.

DIDGQ±01
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1155
1349 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
1. DTCS FOR SUPPLEMENTAL RESTRAINT SYSTEM
If a trouble code is displayed during the DTC check, check the circuit listed for the code in the table below
(Proceed to the page listed for that circuit).
HINT:

When the SRS warning light remains on and the DTC output is the normal system code, a voltage
source drop is likely to occur. This malfunction is not stored in the memory by the airbag sensor assem-
bly. If the power source voltage returns to normal, the SRS warning light will automatically go off.

When 2 or more codes are indicated, the code with the lower number appears first.

If a code is not listed on the display chart, the airbag sensor assembly may have failed.

In the case of any malfunction concerning an open circuit, short to ground, or short to B+ due to a squib,
other malfunction codes may not be detected. In this case, repair the malfunction currently indicated
and then perform malfunction diagnosis again.

Mark in the check mode column:
ºº: DTC is corresponding to the check mode.
º º: DTC is not corresponding to the check mode.

When the DTC B1650/32 is detected as a result of troubleshooting for the Supplemental Restraint Sys-
tem, perform troubleshooting for the occupant classification system as shown in the chart below.
DTC No.
(See
Page)
Detection ItemTrouble AreaCheck ModeSRS
Warning Light
B1000/31
(DI±1161)
Airbag sensor assembly malfunction
Airbag sensor assemblyON
B1610/13
(DI±1162)
Front airbag sensor RH malfunction

Front airbag sensor RH

Airbag sensor assembly

Cowl wire

Engine room main wire
ON
B1615/14
(DI±1171)
Front airbag sensor LH malfunction

Front airbag sensor LH

Airbag sensor assembly

Cowl wire

Engine room main wire
ON
B1620/21
(*1)
(DI±1180)

Side airbag sensor assembly RH malfunction

Side airbag sensor assembly RH

Airbag sensor assembly

Floor wire
ON
B1625/22
(*1)
(DI±1186)

Side airbag sensor assembly LH malfunction

Side airbag sensor assembly LH

Airbag sensor assembly

Floor wire No. 2
ON
B1630/23
(*1)
(DI±1192)

Curtain shield airbag sensor RH malfunction

Curtain shield airbag sensor assembly RH

Airbag sensor assembly

Floor wire
ON
B1635/24
(*1)
(DI±1198)

Curtain shield airbag sensor LH malfunction

Curtain shield airbag sensor assembly LH

Airbag sensor assembly

Floor wire No. 2
ON
B1650/32
(DI±1204)
Occupant classification system malfunction

Occupant classification system

Airbag sensor assembly

Floor wire

Seat wire No. 1
ON
B1653/35
(DI±1213)
Seat position sensor assembly malfunction

Seat position airbag sensor assembly

Airbag sensor assembly

Floor wire No. 2
ON