Toyota Sequoia (2005). Manual - part 375

H43111

H43105

H23817

C

B

D

A

Occupant
Classification
Sensor Rear RH

SVC4

SGD4

SIG4

Occupant
Classification
ECU

Seat Wire No. 1

O7

H43111

H43105

H23817

C

B

D

A

Occupant
Classification
Sensor Rear RH

SVC4

SGD4

SIG4

Occupant
Classification
ECU

Seat Wire No. 1

O7

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1295

1489

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

O7–10 (SIG4) – 

O7–4 (SGD4)

Always

1 M

Ω

 or higher

O7–6 (SVC4) – 

O7–4 (SGD4)

Always

1 M

Ω

 or higher

O7–10 (SIG4) – 

O7–6 (SVC4)

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

O7–4 (SGD4) – 

Body ground

Always

1 M

Ω

 or higher

O7–6 (SVC4) – 

Body ground

Always

1 M

Ω

 or higher

O7–10 (SIG4) – 

Body ground

Always

1 M

Ω

 or higher

NG

Repair or replace seat wire No. 1.

OK

DI–1296

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1490

7

Check DTC.

PREPARATION:
(a)

Connect the connectors to the occupant classification ECU and the occupant classification sensor rear
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 B1783 is not output.

HINT:
Codes other than DTC B1783 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

).

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1297

1491

8

Replace occupant classification ECU.

(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 occupant classification ECU (see page 

RS–111

).

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

NEXT

9

Perform zero point calibration.

(a)

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

(b)

Connect the hand–held tester to the DLC3.

(c)

Turn the ignition switch to the ON position.

(d)

Using the hand–held tester, perform ”Zero point calibration” (see page 

DI–1128

).

OK:

The ”COMPLETED” is displayed.

NG

Go to step 12.

OK

10

Perform sensitivity check.

Using the hand–held tester, perform ”Sensitivity check” (see page 

DI–1128

).

OK:

Standard value: 27 to 33 kg (59.52 to 72.75 lb)

NG

Go to step 12.

OK

DI–1298

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1492

11

Check DTC.

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 B1783 is not output.

HINT:
Codes other than DTC B1783 may be output at this time, but they are not related to this check.

NG

Go to step 12.

OK

END