Toyota Sequoia (2005). Manual - part 394

H41440

H23351

D Squib

Spiral 
Cable

Airbag 

Sensor 

Assembly

D+

D–

C

D

E

F

A

B

Cowl Wire

A23

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1371

1565

21

Check cowl wire.

PREPARATION:
(a)

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

(b)

Disconnect the 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

A23–1 (D+) – 

Body ground

Ignition switch ON

Below 1 V

A23–2 (D–) – 

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

A23–1 (D+) – A23–2 (D–)

Always

Below 1 

Ω

A23–1 (D+) – 

Body ground

Always

1 M

Ω

 or higher

A23–2 (D–) – 

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

A23–1 (D+) – A23–2 (D–)

Always

1 M

Ω

 or higher

NG

Repair or replace cowl wire.

OK

H23974

H01000

H24510

D Squib

Spiral
Cable

Airbag

Sensor

Assembly

D+

D–

Color: Orange

A

B

C

D

E

F

DI–1372

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1566

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

D+ – Body ground

Ignition switch ON

Below 1 V

D– – 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

D+ – D–

Always

Below 1 

Ω

D+ – Body ground

Always

1 M

Ω

 or higher

D– – 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

D+ – D–

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–1373

1567

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–1374

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1568

DTC

B1805/52 Short in P Squib Circuit

DTC

B1806/52 Open in P Squib Circuit

DTC

B1807/52 Short in P Squib Circuit (to Ground)

DTC

B1808/52 Short in P Squib Circuit (to B+)

CIRCUIT DESCRIPTION

The P squib 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 circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1805/52

The airbag sensor assembly receives a line short circuit

signal 5 times in the P squib circuit during primary check.

P squib malfunction

Airbag sensor assembly malfunction

Front passenger airbag assembly (P squib)

Airbag sensor assembly

Cowl wire

B1806/52

The airbag sensor assembly receives an open circuit sig-

nal in the P squib circuit for 2 seconds.

P squib malfunction

Airbag sensor assembly malfunction

Front passenger airbag assembly (P squib)

Airbag sensor assembly

Cowl wire

B1807/52

The airbag sensor assembly receives a short circuit to

ground signal in the P squib circuit for 0.5 seconds.

P squib malfunction

Airbag sensor assembly malfunction

Front passenger airbag assembly (P squib)

Airbag sensor assembly

Cowl wire

B1808/52

The airbag sensor assembly receives a short to B+ circuit

signal in the P squib circuit for 0.5 seconds.

P squib malfunction

Airbag sensor assembly malfunction

Front passenger airbag assembly (P squib)

Airbag sensor assembly

Cowl wire

DIDHJ–01