Toyota Sequoia (2005). Manual - part 425

H23040

LA

A20

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1495

1689

5

Check combination meter.

PREPARATION:
(a)

Turn the ignition switch to the LOCK position.

(b)

Disconnect the negative (–) terminal cable from the bat-
tery, and wait for at least 90 seconds.

(c)

Connect the connector to the combination meter.

(d)

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 according to the value(s) in the table
below.

OK:

Tester Connection

Condition

Specified Condition

A20–14 (LA) – 

Body ground

Ignition switch ON

8 to 14 V

NG

Replace combination meter
(see page 

BO–89

).

OK

Replace airbag sensor assembly (see page 

RS–82

).

DI–1496

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1690

SRS Warning Light Circuit Malfunction (Does not light up, when
ignition switch is turned to on)

CIRCUIT DESCRIPTION

The SRS warning light is located on the combination meter assembly.
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 the 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 DTC is displayed by blinking the SRS warning
light.

WIRING DIAGRAM

See page 

DI–1491

.

INSPECTION PROCEDURE

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

Turn the ignition switch to the LOCK position.

(b)

Disconnect the negative (–) terminal cable from the battery, and wait for at least 90 seconds.

(c)

Disconnect the connectors from the airbag sensor assembly.

(d)

Disconnect the connectors from the steering wheel pad.

(e)

Disconnect the connectors from the front passenger airbag assembly.

(f)

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

(g)

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

(h)

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

1

Check battery.

CHECK:
Measure the voltage of the battery.
OK:

Voltage: 11 to 14 V

NG

Replace battery.

OK

DIDHV–01

H23040

LA

A20

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1497

1691

2

Check combination meter.

PREPARATION:
Connect the negative (–) terminal cable to the battery, and wait for at least 2 seconds.
CHECK:
Turn the ignition switch to the ON position, check the operation of the SRS warning light.
OK:

The SRS warning light comes on (goes off 6 seconds after the ignition switch is turned to the
ON position).

NG

Go to step 3.

OK

Replace airbag sensor assembly (see page 

RS–82

).

3

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

PREPARATION:
(a)

Turn the ignition switch to the LOCK position.

(b)

Disconnect the negative (–) terminal cable from the bat-
tery, and wait for at least 90 seconds.

(c)

Disconnect the connector from the combination meter.

(d)

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 according to the value(s) in the table
below.

OK:

Tester Connection

Condition

Specified Condition

A20–14 (LA) – 

Body ground

Ignition switch ON

Below 1 V

NG

Repair or replace wire harness.

OK

Replace combination meter (see page 

BO–89

).

H24006

Airbag Sensor 
Assembly

TC

15

P–B

A20

G

Instrument Panel J/B

Sub J/B No. 4

D6
DLC3

5

4D

5

4E

5

4B

5

4C

5

4A

P–B

P–B

P–B

P–B

23

E4

ECM

TC

T5 
Translate ECU

T17 
Tire Pressure Monitor ECU

TC

TC

28

12

13

TC

CG

4

O

A

J43
J/C

IG

A

O

9

1A

15

1F

DI–1498

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1692

TC Terminal Circuit

CIRCUIT DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3. 
The DTCs are displayed by blinking of the SRS warning light.

WIRING DIAGRAM

HINT:
When each warning light stays blinking, a ground short in the wiring of the terminal TC of the DLC3 or an
internal ground short in each ECU is suspected.

DIDHW–01