Toyota Sequoia (2005). Manual - part 402

H41440

H23351

Spiral 
Cable

Airbag 

Sensor 

Assembly

D2+

D2–

D Squib

(Dual stage – 

2nd step)

B

C

E

D

F

A

Cowl Wire

A23

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1403

1597

21

Check cowl wire.

PREPARATION:
(a)

Restore the released activation prevention mechanism of
connector ”B” to the original condition.

(b)

Disconnect the cowl wire connector from the spiral cable.

(c)

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

A23–4 (D2+) – 

Body ground

Ignition switch ON

Below 1 V

A23–3 (D2–) – 

Body ground

Ignition switch ON

Below 1 V

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.

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

Tester Connection

Condition

Specified Condition

A23–4 (D2+) – 

A23–3 (D2–)

Always

Below 1 

Ω

A23–4 (D2+) – 

Body ground

Always

1 M

Ω

 or higher

A23–3 (D2–) – 

Body ground

Always

1 M

Ω

 or higher

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

A23–4 (D2+) – 

A23–3 (D2–)

Always

1 M

Ω

 or higher

NG

Repair or replace cowl wire.

OK

H41479

H23350

Spiral
Cable

Airbag

Sensor

Assembly

D2+

D2–

D Squib

(Dual stage – 

2nd step)

Color: Black

A

B

D

E

C

F

DI–1404

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1598

22

Check spiral cable.

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

D2+ – Body ground

Ignition switch ON

Below 1 V

D2– – Body ground

Ignition switch ON

Below 1 V

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.

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

Tester Connection

Condition

Specified Condition

D2+ – D2–

Always

Below 1 

Ω

D2+ – Body ground

Always

1 M

Ω

 or higher

D2– – body ground

Always

1 M

Ω

 or higher

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

DI–1137

).

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

Tester Connection

Condition

Specified Condition

D2+ – D2–

Always

1 M

Ω

 or higher

NG

Replace spiral cable (see page 

RS–21

).

OK

From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check (see page 

DI–1137

).

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1405

1599

HINT:

Perform the simulation method by selecting the check mode with the hand–held tester (see page 

DI–1151

).

After selecting the check mode, perform the simulation method by wiggling each connector of the air-
bag system or driving the vehicle on a city or rough road (see page 

DI–1151

).

DI–1406

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1600

DTC

B1815/54 Short in P Squib (Dual stage – 2nd step) 

Circuit

DTC

B1816/54 Open in P Squib (Dual stage – 2nd step) 

Circuit

DTC

B1817/54 Short in P Squib (Dual stage – 2nd step) 

Circuit (to Ground)

DTC

B1818/54 Short in P Squib (Dual stage – 2nd step) 

Circuit (to B+)

CIRCUIT DESCRIPTION

The P squib (Dual stage – 2nd step) circuit consists of the airbag sensor assembly and the front passenger
airbag assembly.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the P squib (Dual stage – 2nd step) circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1815/54

The airbag sensor assembly receives a line short circuit

signal 5 times in the P squib (Dual stage – 2nd step) cir-

cuit during primary check.

P squib malfunction

Airbag sensor assembly malfunction

Front passenger airbag assembly (P squib, Dual stage – 2nd

step)

Airbag sensor assembly

Cowl wire

B1816/54

The airbag sensor assembly receives an open circuit sig-

nal in the P squib (Dual stage – 2nd step) circuit for 2 se-

conds.

P squib malfunction

Airbag sensor assembly malfunction

Front passenger airbag assembly (P squib, Dual stage – 2nd

step)

Airbag sensor assembly

Cowl wire

B1817/54

The airbag sensor assembly receives a short circuit to

ground signal in the P squib (Dual stage – 2nd step) circuit

for 0.5 seconds.

P squib malfunction

Airbag sensor assembly malfunction

Front passenger airbag assembly (P squib, Dual stage – 2nd

step)

Airbag sensor assembly

Cowl wire

B1818/54

The airbag sensor assembly receives a short to B+ circuit

signal in the P squib (Dual stage – 2nd step) circuit for 0.5

seconds.

P squib malfunction

Airbag sensor assembly malfunction

Front passenger airbag assembly (P squib, Dual stage – 2nd

step)

Airbag sensor assembly

Cowl wire

DIDHL–01