Toyota RAV4 manuals

Toyota Sienna Service Manual: Occupant Classification ECU Malfunction

DTC B1795 Occupant Classification ECU Malfunction

DESCRIPTION

DTC B1795 is recorded when a malfunction is detected in the occupant classification ECU.

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

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK DTC

  1. Turn the ignition switch to the ON position, and wait for at least 10 seconds.
  2. Check the DTCs.

    Result:
    A: DTC B1795 is output.
    B: DTCs B1771 and B1795 are output.

HINT: Codes other than DTC B1771 and B1795 may be output at this time, but they are not related to this check.

2 CHECK FUSE

  1. Measure the resistance of the ECU-B fuse.

Resistance: Below 1 Ω

3 CHECK WIRE HARNESS (SOURCE VOLTAGE)

CHECK WIRE HARNESS (SOURCE VOLTAGE)

  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.  Disconnect the connector from the occupant classification ECU.
  4.  Connect the negative (-) terminal cable to the battery.
  5.  Turn the ignition switch to the ON position.
  6.  Measure the voltage according to the value(s) in the table below.

Standard voltage

Standard voltage

  1. Turn the ignition switch to the LOCK position.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

4 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

5 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.

6 PERFORM SENSITIVITY CHECK

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

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

END

Open in Occupant Classification ECU Battery Positive Line
DTC B1794 Open in Occupant Classification ECU Battery Positive Line DESCRIPTION This circuit consists of the occupant classification ECU and the power source circuit (battery, fuse, wire harness ...

Sleep Operation Failure of Occupant Classification ECU
DTC B1796 Sleep Operation Failure of Occupant Classification ECU DESCRIPTION During sleep mode, the occupant classification ECU reads the condition of each sensor while the ignition switch is of ...

Other materials:

Wiper system
General information Do not use the wipers if the windshield is dry, as this may damage the wiper blades or cause them to become worn more quickly. Safety information Warning If the wipers start moving in the folded away state, body parts can be jammed or damage may occur to parts of the vehicle. Th ...

Charge Warning Light Comes ON while Driving
INSPECTION PROCEDURE 1 CHECK LOCK FUNCTION OF CLUTCH PULLEY (a) Check the lock function with the pulley installed in the vehicle. (1) Visually check that the rotor in the generator operates with the engine started. (b) Check the lock function with the pulley removed from the vehicle. ( ...

Cargo net hooks
Raise the hook to use. Pattern 1 Pattern 2 NOTICE To prevent damage to the cargo net hooks, avoid hanging things other than a cargo net on them. Storage box (if equipped) Engage the latch buckle. ...

В© 2011-2022 Copyright www.tsienna.net