Toyota RAV4 manuals

Toyota Sienna Service Manual: Passenger Side Buckle Switch Circuit Malfunction

DTC B1771 Passenger Side Buckle Switch Circuit Malfunction

DESCRIPTION

The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner belt assembly RH.

DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit.

Troubleshoot DTC B1771 first when DTCs B1771 and B1795 are output simultaneously

DESCRIPTION

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.

OK: DTC B1771 is not output.

HINT: Codes other than DTC B1771 may be output at this time, but they are not related to this 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 front seat inner belt assembly RH.

OK: The connectors are properly connected.

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 front seat inner belt assembly RH.
  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

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 B17-2 and B17-1 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

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

6 CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)

CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)

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

Standard resistance

Standard resistance

7 CHECK DTC

  1. Connect the connectors to the occupant classification ECU and the front seat inner belt assembly RH.
  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.

OK: DTC B1771 is not output.

HINT: Codes other than DTC B1771 may be output at this time, but they are not related to this check.

8 REPLACE FRONT SEAT INNER BELT 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 inner belt assembly RH.

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

  4.  Connect the negative (-) terminal cable to the battery.
  5.  Turn the ignition switch to the ON position.
  6.  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.

  7.  Turn the ignition switch to the LOCK position.
  8.  Turn the ignition switch to the ON position.
  9.  Check the DTCs.

OK: DTC B1771 is not output.

HINT: Codes other than DTC B1771 may be output at this time, but they are not related to this check.

9 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

10 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".

OK: "COMPLETED" is displayed.

11 PERFORM SENSITIVITY CHECK

  1. Using the intelligent tester, perform "Sensitivity check".

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

END

Diagnostic trouble code chart
1. DTCS FOR OCCUPANT CLASSIFICATION SYSTEM If a trouble code is displayed during the DTC check, check the circuit listed for the code in the table below (proceed to the page listed for that circuit ...

Front Occupant Classification Sensor LH Circuit Malfunction
DTC B1780 Front Occupant Classification Sensor LH Circuit Malfunction DESCRIPTION The front occupant classification sensor LH circuit consists of the occupant classification ECU and the front oc ...

Other materials:

Removal
HINT: On the RH side, use the same procedures as on the LH side. 1. REMOVE FRONT DOOR SERVICE HOLE COVER LH  Remove the front lower frame bracket garnish LH.  Remove the front door inside handle bezel plug LH.  Remove the front armrest base panel upper LH.  Remove the ...

Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2)
DESCRIPTION Shifting from 1st to 5th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL3, S4 and SR which are controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM cont ...

Engine immobiliser system
PARTS LOCATION SYSTEM DESCRIPTION The engine immobiliser system has been designed to prevent the vehicle from being stolen. This system uses a transponder key ECU that stores the key code of the authorized ignition key. If an attempt is made to start the engine using a non-authorized key, ...

В© 2011-2021 Copyright www.tsienna.net