Toyota Sequoia (2005). Manual - part 424

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1491

1685

SRS Warning Light Circuit Malfunction (Always light up, when
DTC is not output)

CIRCUIT DESCRIPTION

The SRS warning light is located on the combination meter. 
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition
switch is turned from the LOCK position to ON position, and then goes off automatically. 
If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem. 
When terminals TC and CG of the DLC3 are connected, the DTCs are displayed by blinking the SRS warning
light.

DIDHU–01

H23996

LA

A20

14

AB

R

I18
Ignition SW

Combination Meter

Battery

IG2

A20

21

E1

A20

25

E2

A20

26

B

W–B

W–B

B–R

IG2

AM2

6

5

W–R

SRS

B–Y

C5

29

C6

12

C6

24

1D

4

1A

5

1A

3

IGN1

1D

6

1F

9

10

1A

6

1A

8

Instrument Panel J/B

Engine Room J/B

1H

11

1J

7

2C

1

2D

1

AM2

BR

W–B

W–B

J8
J/C

A

A

4

5

B

B

B–O

IE

Airbag Sensor
Assembly

1C

2

Instrument Panel J/B

F10
Fusible Link Block

1C

3

D6
DLC3

11

4B

10

4A

20

4A

10

B–Y

B–Y

1F

W–R

Sub J/B No. 4

DI–1492

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1686

WIRING DIAGRAM

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1493

1687

INSPECTION PROCEDURE

1

Check battery.

CHECK:
Measure the voltage of the battery.
OK:

Voltage: 11 to 14 V

NG

Replace battery.

OK

2

Check connection of connectors.

PREPARATION:
Disconnect the negative (–) terminal cable from the battery, and wait for at least 90 seconds.
CHECK:
Check that the connectors are properly connected to the airbag sensor assembly and combination meter.
OK:

The connectors are connected securely.

NG

Connect connectors.

OK

3

Prepare for inspection.

CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(a)

Disconnect the connectors from the airbag sensor assembly.

(b)

Disconnect the connectors from the steering wheel pad.

(c)

Disconnect the connectors from the front passenger airbag assembly.

(d)

w/ Side and curtain shield airbag:
Disconnect the connectors from the side airbag assembly LH and RH.

(e)

w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH and RH.

(f)

Disconnect the connectors from the front seat outer belt LH and RH.

NEXT

H23607

I27704

H24031

A20

LA

C5

C5–29

Airbag Sensor Assembly:

Combination Meter:

DI–1494

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1688

4

Check wire harness (airbag sensor assembly – combination meter).

PREPARATION:
(a)

Disconnect the connector from the combination meter.

(b)

Connect the negative (–) terminal cable to the battery,
and wait for at least 2 seconds.

CHECK:
(a)

Turn the ignition switch to the ON position.

(b)

Measure the voltage and resistance according to the val-
ue(s) in the table below.

OK:

Tester Connection

Condition

Specified Condition

A20–14 (LA) – C5–29

Always

Below 1 

Ω

A20–14 (LA) – 

Body ground

Always

1 M

Ω

 or higher

A20–14 (LA) – 

Body ground

Ignition switch ON

Below 1 V

NG

Repair or replace wire harness.

OK