Toyota Sequoia (2005). Manual - part 371

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1279

1473

12

Replace front seat assembly RH.

(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 assembly RH (see page 

BO–112

, 

BO–126

).

NEXT

13

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

14

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

END

DI–1280

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1474

DTC

B1782

Occupant Classification Sensor Rear LH 
Circuit Malfunction

CIRCUIT DESCRIPTION

The occupant classification sensor rear LH circuit consists of the occupant classification ECU and the occu-
pant classification sensor rear LH.
DTC B1782 is recorded when a malfunction is detected in the occupant classification sensor rear LH circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B1782

The occupant classification ECU receives a line short

circuit signal, an open circuit signal, a short circuit to

ground signal or a short circuit to B+ signal in the occu-

pant classification sensor rear LH circuit for 2 seconds.

Occupant classification sensor rear LH malfunction

Occupant classification ECU malfunction

Front seat assembly RH 

(Occupant classification sensor rear LH)

Occupant classification ECU

Seat wire No. 1

HINT:
When DTC B1650/32 is detected as a result of troubleshooting for the supplemental restraint system, check
the DTCs stored in the occupant classification ECU. When DTC B1782 is output, perform troubleshooting
for the DTC.

DIDH7–01

H24040

Occupant
Classification ECU

O7

3

SGD3

O10
Occupant Classification 
Sensor Rear LH

O7

9

SIG3

O7

5

SVC3

SGD3

SIG3

SVC3

3

2

1

R–B

G–B

Y–B

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1281

1475

WIRING DIAGRAM

DI–1282

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1476

INSPECTION PROCEDURE

HINT:

If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installa-
tion bolts to see the under surface of seat cushion.

In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time
may cause a problem, such as seat rail deformation. Hold the seat only as necessary.

1

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 B1782 is not output.

HINT:
Codes other than DTC B1782 may be output at this time, but they are not related to this check.

NG

Go to step 2.

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

).