Toyota Sequoia (2005). Manual - part 383

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1327

1521

9

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

10

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.

NEXT

11

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)

NEXT

DI–1328

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1522

12

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 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

Replace airbag sensor assembly
(see page 

RS–82

).

OK

END

C84211

H24024

H24005

Occupant
Classification
ECU

Airbag
Sensor
Assembly

A

FSR+

FSR–

B

C

D

E

F

BL1

Seat Wire No. 1

Floor Wire

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1329

1523

13

Check seat wire No. 1 (short to B+).

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 for 90 seconds.

(c)

Disconnect the seat wire No. 1 connector from the floor
wire.

(d)

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

BL1–3 (FSR+) – 

Body ground

Ignition switch ON

Below 1 V

BL1–5 (FSR–) – 

Body ground

Ignition switch ON

Below 1 V

NG

Repair or replace seat wire No. 1.

OK

Repair or replace floor wire.

C84213

H43694 H24024

H24004

Occupant
Classification
ECU

Airbag
Sensor
Assembly

A

O6

FSR+

FSR–

B

C

D

E

F

Service Wire

BL1

Seat Wire No. 1

Floor Wire

FSR+

FSR–

C84211

H24024

H24005

Occupant
Classification
ECU

Airbag
Sensor
Assembly

A

FSR+

FSR–

B

C

D

E

F

BL1

Seat Wire No. 1

Floor Wire

DI–1330

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1524

14

Check seat wire No. 1 (open).

PREPARATION:
Disconnect the seat wire No. 1 connector from the floor wire.
HINT:
The service wire has already been inserted into connector ”E”.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

BL1–3 (FSR+) – 

BL1–5 (FSR–)

Always

Below 1 

Ω

NG

Repair or replace seat wire No. 1.

OK

Repair or replace floor wire.

15

Check seat wire No. 1 (short).

PREPARATION:
Disconnect the seat wire No. 1 connector from the floor wire.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

BL1–3 (FSR+) – 

BL1–5 (FSR–)

Always

1 M

Ω

 or higher

NG

Repair or replace seat wire No. 1.

OK

Repair or replace floor wire.