Toyota Sequoia (2005). Manual - part 367

H43111

H43105

H23817

SGD1

Occupant
Classification
Sensor Front LH

C

B

D

A

SIG1

O7

SVC1

Seat Wire No. 1

Occupant
Classification
ECU

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1263

1457

2

Check connection of connectors.

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.

CHECK:
Check that the connectors are properly connected to the occupant classification ECU and the occupant clas-
sification sensor front LH.
OK:

The connectors are connected securely.

NG

Connect connectors, then go to step 1.

OK

3

Check seat wire No. 1 (short to B+).

PREPARATION:
(a)

Disconnect the connectors from the occupant classifica-
tion ECU and the occupant classification sensor front LH.

(b)

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

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

O7–1 (SGD1) – 

Body ground

Ignition switch ON

Below 1 V

O7–7 (SIG1) – 

Body ground

Ignition switch ON

Below 1 V

O7–11 (SVC1) – 

Body ground

Ignition switch ON

Below 1 V

NG

Repair or replace seat wire No. 1.

OK

H43111

H43106

H43699

H23818

SGD1

C

B

D

A

SIG1

O7

Service
Wire

Occupant
Classification
ECU

Occupant
Classification
Sensor Front LH

SVC1

Service Wire

SIG1

SVC1

SGD1

Seat Wire No. 1

O8

DI–1264

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1458

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 O8–1 (SVC1) and O8–3
(SGD1), O8–2 (SIG1) and O8–3 (SGD1) of connector
”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

O7–11 (SVC1) – 

O7–1 (SGD1)

Always

Below 1 

Ω

O7–7 (SIG1) – 

O7–1 (SGD1)

Always

Below 1 

Ω

NG

Repair or replace seat wire No. 1.

OK

H43111

H43105

H23817

SGD1

Occupant
Classification
Sensor Front LH

C

B

D

A

SIG1

O7

SVC1

Seat Wire No. 1

Occupant
Classification
ECU

H43111

H43105

H23817

SGD1

Occupant
Classification
Sensor Front LH

C

B

D

A

SIG1

SVC1

O7

Seat Wire No. 1

Occupant
Classification
ECU

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1265

1459

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

O7–7 (SIG1) – 

O7–1 (SGD1)

Always

1 M

Ω

 or higher

O7–11 (SVC1) – 

O7–1 (SGD1)

Always

1 M

Ω

 or higher

O7–7 (SIG1) – 

O7–11 (SVC1)

Always

1 M

Ω

 or higher

NG

Repair or replace seat wire No. 1.

OK

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

O7–1 (SGD1) – 

Body ground

Always

1 M

Ω

 or higher

O7–7 (SIG1) – 

Body ground

Always

1 M

Ω

 or higher

O7–11 (SVC1) – 

Body ground

Always

1 M

Ω

 or higher

NG

Repair or replace seat wire No. 1.

OK

DI–1266

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1460

7

Check DTC.

PREPARATION:
(a)

Connect the connectors to the occupant classification ECU and the occupant classification sensor
front LH.

(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 B1780 is not output.

HINT:
Codes other than DTC B1780 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

).