Toyota Sequoia (2005). Manual - part 336

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

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1139

1333

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

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1334

(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 (”ON” and ”OFF”) 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 ”Trouble in indication of Passenger airbag ON/OFF indicator”

 

(see page

DI–1485

).

Condition

”ON” indicator

”OFF” indicator

Vacant

OFF

OFF

Adult is seated.

ON

OFF

Child is seated.

OFF

ON

Child restraint system (CRS) is set.

OFF

ON

Occupant classification system failure

OFF

ON

H22552

Ignition Switch

ON

OFF

Passenger Airbag 
ON/OFF Indicator
(”ON”)

ON

OFF

ON

OFF

4 sec.

ON/OFF condition depends on the 
front passenger detection results.

2 sec.

4 sec.

2 sec.

Passenger Airbag 
ON/OFF Indicator
(”OFF”)

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1141

1335

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 (”OFF”) 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 Switch

ON

OFF

RSCA OFF Switch

OFF

ON

RSCA OFF Indicator

ON

OFF

Approx.
3 seconds

Approx.
2 seconds

Approx.
2 seconds

Bulb Check
(SW input signal prohibited)

Approx.
0.2 seconds

Approx.
0.2 seconds

H23823

DI–1142

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1336

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 ”Prob-
lem Symptoms Table” (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.