Toyota Sequoia (2005). Manual - part 382

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1323

1517

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 airbag sensor
assembly.
OK:

The connectors are connected securely.

NG

Connect connectors, then go to step 1.

OK

3

Prepare for inspection.

PREPARATION:
CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(a)

Disconnect the connectors from the airbag sensor assembly.

(b)

Disconnect the connectors from the steering wheel pad.

(c)

Disconnect the connectors from the front passenger airbag assembly.

(d)

w/ Side and curtain shield airbag:
Disconnect the connectors from the side airbag assembly LH and RH.

(e)

w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH and RH.

(f)

Disconnect the connectors from the front seat outer belt LH and RH.

NEXT

C84205

G27650

H24003

Occupant 
Classification ECU

Airbag
Sensor
Assembly

D

A21

FSR–

FSR+

C

B

A

E

F

C84207

G27650

H43694

H24002

Occupant 
Classification ECU

Airbag
Sensor
Assembly

D

FSR–

FSR+

C

B

A

FSR+

FSR–

O6

E

F

A21

Service Wire

DI–1324

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1518

4

Check airbag sensor assembly communication circuit (short to B+).

PREPARATION:
(a)

Disconnect the connector from the occupant classifica-
tion ECU.

(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

A21–16 (FSR+) – 

Body ground

Ignition switch ON

Below 1 V

A21–24 (FSR–) – 

Body ground

Ignition switch ON

Below 1 V

NG

Go to step 13.

OK

5

Check airbag sensor assembly communication circuit (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 O6–8 (FSR+) and O6–4
(FSR–) of connector ”E”.

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

A21–16 (FSR+) – 

A21–24 (FSR–)

Always

Below 1 

Ω

NG

Go to step 14.

OK

C84205

G27650

H24003

Occupant 
Classification ECU

Airbag
Sensor
Assembly

D

A21

FSR–

FSR+

C

B

A

E

F

C84205

G27650

H24003

Occupant 
Classification ECU

Airbag
Sensor
Assembly

D

A21

FSR–

FSR+

C

B

A

E

F

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1325

1519

6

Check airbag sensor assembly communication circuit (short).

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

Tester Connection

Condition

Specified Condition

A21–16 (FSR+) – 

A21–24 (FSR–)

Always

1 M

Ω

 or higher

NG

Go to step 15.

OK

7

Check airbag sensor assembly communication circuit (short to ground).

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

Tester Connection

Condition

Specified Condition

A21–16 (FSR+) – 

Body ground

Always

1 M

Ω

 or higher

A21–24 (FSR–) – 

Body ground

Always

1 M

Ω

 or higher

NG

Go to step 16.

OK

DI–1326

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1520

8

Check DTC.

PREPARATION:
(a)

Connect the connectors to the occupant classification ECU and the airbag sensor assembly.

(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 B1790 is not output.

HINT:
Codes other than DTC B1790 may be output at this time, but they are not related to this check.

NG

Go to step 9.

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

).