Toyota RAV4 manuals

Toyota Sienna Service Manual: Rear Occupant Classification Sensor LH Circuit Malfunction

DTC B1782 Rear Occupant Classification Sensor LH Circuit Malfunction

DESCRIPTION

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

DTC B1782 is recorded when a malfunction is detected in the rear occupant classification sensor 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 rear occupant classification sensor LH circuit for 2 seconds.
  • Rear occupant classification sensor LH malfunction
  • Occupant classification ECU malfunction
  • Front seat assembly RH (Rear occupant classification sensor LH)
  • Occupant classification ECU
  • Front seat wire RH

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

1 CHECK DTC

  1. Turn the ignition switch to the ON position.
  2.  Clear the DTCs stored in the memory.

    HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.

  3.  Turn the ignition switch to the LOCK position.
  4.  Turn the ignition switch to the ON position.
  5.  Check the DTCs (35).

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

USE SIMULATION METHOD TO CHECK

2 CHECK CONNECTION OF CONNECTORS

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3.  Check that the connectors are properly connected to the occupant classification ECU and the rear occupant classification sensor LH.

OK: The connectors are connected.

CONNECT CONNECTORS, THEN GO TO STEP 1

3 CHECK FRONT SEAT WIRE RH (SHORT TO B+)

CHECK FRONT SEAT WIRE RH (SHORT TO B+)

  1. Disconnect the connectors from the occupant classification ECU and the rear occupant classification sensor LH.
  2.  Connect the negative (-) terminal cable to the battery.
  3.  Turn the ignition switch to the ON position.
  4.  Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

REPAIR OR REPLACE FRONT SEAT WIRE RH

4 CHECK FRONT SEAT WIRE RH (OPEN)

CHECK FRONT SEAT WIRE RH (OPEN)

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3.  Using a service wire, connect O7-1 (SVC3) and O7-3 (SGD3), and connect O7-2 (SIG3) and O7-3 (SGD3) of connector "C".

    NOTICE: Do not forcibly insert a service wire into the terminals of the connector when connecting.

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

Standard resistance

Standard resistance

REPAIR OR REPLACE FRONT SEAT WIRE RH

5 CHECK FRONT SEAT WIRE RH (SHORT)

CHECK FRONT SEAT WIRE RH (SHORT)

  1. Disconnect the service wire from connector "C".
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

REPAIR OR REPLACE FRONT SEAT WIRE RH

6 CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)

CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)

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

Standard resistance

Standard resistance

REPAIR OR REPLACE FRONT SEAT WIRE RH

7 CHECK DTC

  1. Connect the connectors to the occupant classification ECU and the rear occupant classification sensor LH.
  2.  Connect the negative (-) terminal cable to the battery
  3.  Turn the ignition switch to the ON position.
  4.  Clear the DTCs stored in the memory.

    HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.

  5.  Turn the ignition switch to the LOCK position.
  6.  Turn the ignition switch to the ON position.
  7.  Check the DTCs (35).

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.

USE SIMULATION METHOD TO CHECK

8 REPLACE OCCUPANT CLASSIFICATION ECU

  1. Turn the ignition switch to the LOCK position.
  2.  Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3.  Replace the occupant classification ECU.

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

9 PERFORM ZERO POINT CALIBRATION

  1. Connect the negative (-) terminal cable to the battery.
  2.  Connect the intelligent tester to the DLC3.
  3.  Turn the ignition switch to the ON position.
  4.  Using the intelligent tester, perform "Zero point calibration" (28).

OK: "COMPLETED" is displayed.

Go to step 12

10 PERFORM SENSITIVITY CHECK

  1. Using the intelligent tester, perform "Sensitivity check" (28).

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

Go to step 12

11 CHECK DTC

  1. Turn the ignition switch to the ON position.
  2.  Clear the DTCs stored in the memory.

    HINT: First clear DTCs stored in the occupant classification ECU and then in the center airbag sensor assembly.

  3.  Turn the ignition switch to the LOCK position.
  4.  Turn the ignition switch to the ON position.
  5.  Check the DTCs (35).

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

END

12 REPLACE FRONT SEAT ASSEMBLY RH

  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
  3.  Replace the front seat assembly RH ( for flat type, SE-48 for manual seat, SE-58 for power seat).

13 PERFORM ZERO POINT CALIBRATION

  1. Connect the negative (-) terminal cable to the battery.
  2. Connect the intelligent tester to the DLC3.
  3.  Turn the ignition switch to the ON position.
  4.  Using the intelligent tester, perform "Zero point calibration" (28).

OK: "COMPLETED" is displayed.

14 PERFORM SENSITIVITY CHECK

  1. Using the intelligent tester, perform "Sensitivity check" (28).

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

END

Front Occupant Classification Sensor RH Circuit Malfunction
DTC B1781 Front Occupant Classification Sensor RH Circuit Malfunction DESCRIPTION The front occupant classification sensor RH circuit consists of the occupant classification ECU and the front oc ...

Rear Occupant Classification Sensor RH Circuit Malfunction
DTC B1783 Rear Occupant Classification Sensor RH Circuit Malfunction DESCRIPTION The rear occupant classification sensor RH circuit consists of the occupant classification ECU and the rear occup ...

Other materials:

Installation
HINT: Use the same procedures for the RH side and LH side. The procedures listed below are for the LH side. 1. INSTALL CURTAIN SHIELD AIRBAG ASSEMBLY LH  Install the curtain shield airbag assembly LH with the 13 bolts in the order shown in the illustration. Torque: 14 N*m ...

Installation
1. INSTALL DISTANCE CONTROL ECU ASSEMBLY  Using a torque wrench, install the bolt. Torque: 5 N*m (51 kgf*cm, 44 in.*lbf) NOTICE: Do not install the dropped or shocked distance control ECU assembly. 2. INITIALIZE DISTANCE CONTROL ECU NOTICE: After replacing the distance control ECU ...

VSC Warning Light Remains ON
DESCRIPTION The skid control ECU is connected to the combination meter via CAN and multiplex communications. If the skid control ECU stores DTCs to shut down TRAC and VSC operation, the VSC warning light comes on in the combination meter. WIRING DIAGRAM INSPECTION PROCEDURE NOTICE: ...

В© 2011-2019 Copyright www.tsienna.net