Toyota Sequoia (2005). Manual - part 365

H43104

H43111

H43698

H24039

H24509

B

BGND

Front Seat
Inner Belt RH

C

D

A

BSW

Service
Wire

1

O6

Occupant
Classification ECU

2

B17

Seat Wire No. 1

(*1)

B17 (*2)

1

2

*1: w/ Power Seat
*2: w/o Power Seat

Service Wire

H43103

H43111

H23819

Occupant
Classification ECU

BGND

BSW

C

B

D

A

Front Seat
Inner Belt RH

O6

Seat Wire No. 1

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1255

1449

4

Check seat wire No. 1 (open).

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)

Using a service wire, connect B17–1 and B17–2 of con-
nector ”C”.

NOTICE:
Do not forcibly insert a service wire into the terminals of the
connector when connecting.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

O6–9 (BSW) – 

O6–5 (BGND)

Always

Below 1 

Ω

NG

Repair or replace seat wire No. 1.

OK

5

Check seat wire No. 1 (short).

PREPARATION:
Disconnect the service wire from connector ”C”.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

O6–9 (BSW) – 

O6–5 (BGND)

Always

1 M

Ω

 or higher

NG

Repair or replace seat wire No. 1.

OK

H43103

H43111

H23819

Occupant
Classification ECU

BGND

BSW

C

B

D

A

Front Seat
Inner Belt RH

O6

Seat Wire No. 1

DI–1256

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1450

6

Check seat wire No. 1 (short to ground).

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

Tester Connection

Condition

Specified Condition

O6–9 (BSW) – 

Body ground

Always

1 M

Ω

 or higher

O6–5 (BGND) – 

Body ground

Always

1 M

Ω

 or higher

NG

Repair or replace seat wire No. 1.

OK

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1257

1451

7

Check DTC.

PREPARATION:
(a)

Connect the connectors to the occupant classification ECU and the front seat inner belt RH.

(b)

Connect the negative (–) terminal cable to the battery.

CHECK:
(a)

Turn the ignition switch to the ON position.

(b)

Clear the DTCs stored in memory (see page 

DI–1147

).

HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
(c)

Turn the ignition switch to the LOCK position.

(d)

Turn the ignition switch to the ON position.

(e)

Using the hand–held tester, check the DTCs of the occupant classification ECU (see page 

DI–1147

).

OK:

DTC B1771 is not output.

HINT:
Codes other than DTC B1771 may be output at this time, but they are not related to this check.

NG

Go to step 8.

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

).

DI–1258

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1452

8

Replace front seat inner belt RH.

PREPARATION:
(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)

Replace the front seat inner belt RH (see page 

BO–112

, 

BO–126

).

HINT:
Perform the inspection using parts from a normal vehicle if possible.
(d)

Connect the negative (–) terminal cable to the battery.

CHECK:
(a)

Turn the ignition switch to the ON position.

(b)

Clear the DTCs stored in memory (see page 

DI–1147

).

HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
(c)

Turn the ignition switch to the LOCK position.

(d)

Turn the ignition switch to the ON position.

(e)

Using the hand–held tester, check the DTCs of the occupant classification ECU (see page 

DI–1147

).

OK:

DTC B1771 is not output.

HINT:
Codes other than DTC B1771 may be output at this time, but they are not related to this check.

NG

Go to step 9.

OK

END