Toyota Sequoia (2005). Manual - part 403

H01454

Airbag Sensor Assembly

A20 P2+

1

Y–R

A22
P Squib

A20 P2–

2

Y–G

3

4

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1407

1601

WIRING DIAGRAM

DI–1408

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1602

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 DTC.

CHECK:
(a)

Proceed to each step according to how to read DTC.
(1)

If using the hand–held tester (read the 5–digit of DTC):
Using the hand–held tester, check the DTCs (see page 

DI–1147

).

RESULT:

DTC B1815 is output.

A

DTC B1816 is output.

B

DTC B1817 is output.

C

DTC B1818 is output.

D

(2)

If not using the hand–held tester (read the 2–digit of DTC):
Check the DTCs (see page 

DI–1147

).

RESULT:

DTC 54 is output.

E

HINT:
Codes other than DTC B1815, B1816, B1817, B1818 and DTC 54 may be output at this time, but they are
not related to this check.

B

Go to step 3.

C

Go to step 4.

D

Go to step 5.

E

Go to step 6.

A

H23635

P2–

P2+

P Squib 
(Dual stage –
2nd step)

A

B

C

D

A22

Cowl Wire

Airbag
Sensor
Assembly

H23635

P2–

P2+

P Squib 
(Dual stage –
2nd step)

A

B

C

D

A22

Cowl Wire

Airbag
Sensor
Assembly

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1409

1603

2

Check cowl wire (short).

PREPARATION:
Release the activation prevention mechanism built into con-
nector ”B” (see page 

DI–1137

).

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

A22–3 (P2+) – 

A22–4 (P2–)

Always

1 M

Ω

 or higher

NG

Repair or replace cowl wire.

OK

Go to step 8.

3

Check cowl wire (open).

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

A22–3 (P2+) – 

A22–4 (P2–)

Always

Below 1 

Ω

NG

Repair or replace cowl wire.

OK

Go to step 9.

H23635

P2–

P2+

P Squib 
(Dual stage –
2nd step)

A

B

C

D

A22

Cowl Wire

Airbag
Sensor
Assembly

H23635

P2–

P2+

P Squib 
(Dual stage –
2nd step)

A

B

C

D

A22

Cowl Wire

Airbag
Sensor
Assembly

DI–1410

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1604

4

Check cowl wire (short to ground).

CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

A22–3 (P2+) – 

Body ground

Always

1 M

Ω

 or higher

A22–4 (P2–) – 

Body ground

Always

1 M

Ω

 or higher

NG

Repair or replace cowl wire.

OK

Go to step 9.

5

Check cowl wire (short to B+).

PREPARATION:
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

A22–3 (P2+) – 

Body ground

Ignition switch ON

Below 1 V

A22–4 (P2–) – 

Body ground

Ignition switch ON

Below 1 V

NG

Repair or replace cowl wire.

OK

Go to step 9.