Toyota 4Runner manuals

Toyota 4Runner: Rear Occupant Classification Sensor RH Circuit Malfunction (B1783)

Toyota 4Runner Service Manual / Vehicle Interior / Supplemental Restraint Systems / Occupant Classification System / Rear Occupant Classification Sensor RH Circuit Malfunction (B1783)

DESCRIPTION

The rear occupant classification sensor RH circuit consists of the occupant classification ECU and rear occupant classification sensor RH.

DTC B1783 is stored when a malfunction is detected in the rear occupant classification sensor RH circuit.

DTC Code

DTC Detection Condition

Trouble Area

B1783

One of the following conditions is met:

  • Occupant classification ECU detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to +B signal in the rear occupant classification sensor RH circuit for 2 seconds.
  • Rear occupant classification sensor RH malfunction.
  • Occupant classification ECU malfunction.
  • Separate type front seat cushion spring RH (Rear occupant classification sensor RH)
  • Front seat wire RH
  • Occupant classification ECU

HINT:

  • When DTC B1650/32 is stored as a result of troubleshooting the airbag system, perform troubleshooting for DTC B1783 of the occupant classification system.
  • Use the Techstream to check for DTCs of the occupant classification ECU, otherwise the DTCs cannot be read.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

HINT:

  • If troubleshooting (wire harness inspection) is difficult to perform, remove the front seat RH installation bolts to see the undersurface of the 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 problems, such as seat rail deformation. Hold the seat up only for as long as necessary.

PROCEDURE

1.

CHECK FOR DTC

(a) Turn the ignition switch to ON, and wait for at least 60 seconds.

(b) Clear the DTCs stored in memory (See page ).


HINT:

  • First clear the DTCs stored in the occupant classification ECU, and then clear the DTCs stored in the center airbag sensor.
  • Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared.

(c) Turn the ignition switch off.

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

(e) Using the Techstream, check for DTCs of the occupant classification ECU (See page ).


OK:

DTC B1783 is not output.

HINT:

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


OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK CONNECTION OF CONNECTOR

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Check that the connectors are properly connected to the occupant classification ECU and rear occupant classification sensor RH.

OK:

Connectors are properly connected.


NG

CONNECT CONNECTOR

OK

3.

CHECK CONNECTOR

(a) Disconnect the connectors from the occupant classification ECU and rear occupant classification sensor RH.

(b) Check that the connectors (on the occupant classification ECU side and rear occupant classification sensor RH side) are not damaged (See page ).


OK:

Connectors are not deformed or damaged.


NG

REPLACE FRONT SEAT WIRE RH

OK

4.

CHECK FRONT SEAT WIRE RH

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.


(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

a10-4 (SGD4) - Body ground

Ignition switch ON

Below 1 V

a10-6 (SVC4) - Body ground

a10-10 (SIG4) - Body ground

(c) Turn the ignition switch off.

(d) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(e) Using service wires, connect terminals 1 (SVC4) and 3 (SGD4), and terminals 2 (SIG4) and 3 (SGD4) of connector C.

NOTICE:

Do not forcibly insert the service wires into the terminals of the connector.

(f) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

a10-6 (SVC4) - a10-4 (SGD4)

Always

Below 1 Ω

a10-10 (SIG4) - a10-4 (SGD4)

(g) Disconnect the service wires from connector C.

(h) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

a10-6 (SVC4) - a10-4 (SGD4)

Always

1 MΩ or higher

a10-10 (SIG4) - a10-4 (SGD4)

a10-6 (SVC4) - a10-10 (SIG4)

a10-4 (SGD4) - Body ground

a10-6 (SVC4) - Body ground

a10-10 (SIG4) - Body ground

Text in Illustration

*1

Front Seat Wire RH

*2

Rear Occupant Classification Sensor RH

*3

Occupant Classification ECU

*4

Service Wire

*5

Connector C

*6

Connector B

*a

Front view of wire harness connector

(to Rear Occupant Classification Sensor RH)

*b

Front view of wire harness connector

(to Occupant Classification ECU)


NG

REPLACE FRONT SEAT WIRE RH

OK

5.

CHECK FOR DTC

(a) Connect the connectors to the occupant classification ECU and rear occupant classification sensor RH.

(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Clear the DTCs stored in memory (See page ).


HINT:

  • First clear the DTCs stored in the occupant classification ECU, and then clear the DTCs stored in the center airbag sensor.
  • Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared.

(e) Turn the ignition switch off.

(f) Turn the ignition switch to ON, and wait for at least 60 seconds.

(g) Using the Techstream, check for DTCs of the occupant classification ECU (See page ).


OK:

DTC B1783 is not output.

HINT:

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


OK

USE SIMULATION METHOD TO CHECK

NG

6.

REPLACE OCCUPANT CLASSIFICATION ECU

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) Replace the occupant classification ECU (See page ).


HINT:

Perform the inspection using parts from a normal vehicle when possible.

NEXT

7.

PERFORM ZERO POINT CALIBRATION

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON, and wait for at least 60 seconds.

(c) Using the Techstream, perform the zero point calibration (See page ).


OK:

"Zero Point Calibration is complete." is displayed.


NG

GO TO STEP 10

OK

8.

PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform the sensitivity check (See page ).


Standard range:

27 to 33 kg (59.5 to 72.8 lb)


NG

GO TO STEP 10

OK

9.

CHECK FOR DTC

(a) Clear the DTCs stored in memory (See page ).


HINT:

  • First clear the DTCs stored in the occupant classification ECU, and then clear the DTCs stored in the center airbag sensor.
  • Use the Techstream to clear the DTCs of the occupant classification ECU, otherwise the DTCs cannot be cleared.

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON, and wait for at least 60 seconds.

(d) Using the Techstream, check for DTCs of the occupant classification ECU (See page ).


OK:

DTC B1783 is not output.

HINT:

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


OK

END

NG

10.

REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY RH

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

(c) for Manual Seat:

(1) Replace the separate type front seat cushion spring RH (See page ).


(d) for Power Seat:

(1) Replace the separate type front seat cushion spring RH (See page ).


HINT:

Perform the inspection using parts from a normal vehicle when possible.

NEXT

11.

PERFORM ZERO POINT CALIBRATION

(a) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

(b) Turn the ignition switch to ON, and wait for at least 60 seconds.

(c) Using the Techstream, perform the zero point calibration (See page ).


OK:

"Zero Point Calibration is complete." is displayed.

NEXT

12.

PERFORM SENSITIVITY CHECK

(a) Using the Techstream, perform the sensitivity check (See page ).


Standard range:

27 to 33 kg (59.5 to 72.8 lb)


NEXT

END

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