Toyota RAV4 manuals

Toyota Sienna Service Manual: Diagnosis system

1. CHECK DLC3

CHECK DLC3

  1.  The ECU uses ISO 15765-4 for communication.

    The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

CHECK DLC3

NOTICE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches, or the doors.

If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

HINT: If the display shows a communication error message when connecting the cable of the intelligent tester to the DLC3, turning the ignition switch to the ON position and operating the intelligent tester, there is a problem on the vehicle side or tool side.

2. SYMPTOM SIMULATION

SYMPTOM SIMULATION

HINT: The most difficult case in troubleshooting is when no symptoms occur. In such cases, a thorough customer problem analysis must be carried out. Then the same or similar conditions and environment in which the problem occurred in the customer's vehicle should be simulated.

No matter how experienced or skilled a technician may be, if he proceeds to troubleshoot without confirming the problem symptoms, he will likely overlook something important and make a wrong guess at some points in the repair operation.

This leads to a standstill in troubleshooting.

  1.  Vibration method: When vibration seems to be the major cause.

HINT: Perform the simulation method only during the primary check period (for approximately 6 seconds after the ignition switch is turned to the ON position).

  1.  Slightly vibrate the part of the sensor considered to be the problem with your fingers and check whether the malfunction occurs.

    HINT: Shaking the relays too strongly may result in open relays.

  2.  Slightly shake the connector vertically and horizontally.
  3.  Slightly shake the wire harness vertically and horizontally.

    The connector joint and fulcrum of the vibration are the major areas to be checked thoroughly.

3. FUNCTION OF SRS WARNING LIGHT

  1. Primary check.
  1.  Turn the ignition switch to the LOCK position.

    After 2 seconds or more, turn the ignition switch to the ON position. The SRS warning light comes on for approximately 6 seconds and the diagnosis of the SRS airbag system (including the seat belt pretensioner and front passenger occupant classification system) is performed.

    HINT: If trouble is detected during the primary check, the SRS warning light remains on even after the primary check period (for approximately 6 seconds) has elapsed.

  1.  Constant check.
  1.  After the primary check, the center airbag sensor assembly constantly monitors the airbag system for trouble.

    HINT: If trouble is detected during the constant check, the center airbag sensor assembly functions as follows:

  1.  Review.
  1.  When the airbag system is normal: The SRS warning light comes on only for the primary check period (for approximately 6 seconds after the ignition switch is turned to the ON position).
  2.  When the airbag system has trouble:

HINT: The center airbag sensor assembly keeps the SRS warning light on if the airbag has been deployed.

4. SRS WARNING LIGHT CHECK

SRS WARNING LIGHT CHECK

  1. Turn the ignition switch to the ON position, and check that the SRS warning light comes on for approximately 6 seconds (primary check).
  2.  Check that the SRS warning light goes off approximately 6 seconds after the ignition switch is turned to the ON position (constant check).

HINT: When any of the following symptoms occur, refer to the "Problem Symptoms Table" (3).

5. FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR

  1.  Initial check
  1.  Turn the ignition switch to the ON position.
  2.  The passenger airbag ON/OFF indicator comes on for approximately 4 seconds, then goes off for approximately 2 seconds.
  3.  Approximately 6 seconds after the ignition switch is turned to the ON position, the passenger airbag ON/OFF indicator will be ON/ OFF depending on the conditions listed below.

FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR

FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR

HINT:

FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR

6. PASSENGER AIRBAG ON/OFF INDICATOR CHECK

PASSENGER AIRBAG ON/OFF INDICATOR CHECK

  1. Turn the ignition switch to the ON position.
  2.  Check that the passenger airbag ON/OFF indicator ("ON" and "OFF") comes on for approximately 4 seconds, then goes off for approximately 2 seconds.

HINT: Refer to the table in the previous step regarding the passenger airbag ON/ OFF indicator when the ignition switch is turned to the ON position and approximately 6 seconds pass.

7. ACTIVATION PREVENTION MECHANISM

  1. FUNCTION OF ACTIVATION PREVENTION MECHANISM
  1.  An activation prevention mechanism is built into the connector (on the center airbag sensor assembly side) of the airbag system squib circuit to prevent accidental airbag activation.
  2.  This mechanism closes the circuit when the connector is disconnected by bringing the short spring into contact with the terminals and shutting off external electricity to prevent accidental airbag activation.
  1.  RELEASE METHOD OF ACTIVATION PREVENTION MECHANISM
  1.  To release the activation prevention mechanism, insert a piece of paper with the same thickness as the male terminal (approximately 0.5 mm (0.020 in.)) between the terminals and the short spring to break the connection.
  2.  Refer to the illustrations on the next 2 pages for connectors used in the activation prevention mechanism and its release method.

CAUTION: Never release the activation prevention mechanism on the squib connector even when inspecting with the squib disconnected.

NOTICE:

ACTIVATION PREVENTION MECHANISM

ACTIVATION PREVENTION MECHANISM

Terminals of ECU
1. CENTER AIRBAG SENSOR ASSEMBLY (w/ Side Airbag) 2. CENTER AIRBAG SENSOR ASSEMBLY (w/o Side Airbag) ...

DTC check / clear
1. DTC CHECK (USING SST CHECK WIRE) Check the DTCs (Present trouble code).  Turn the ignition switch ON, and wait for approximately 60 seconds.  Using SST, connect terminal ...

Other materials:

Evaporator temperature sensor (for rear air conditioning system)
ON-VEHICLE INSPECTION 1. INSPECT REAR A/C EVAPORATOR TEMPERATURE SENSOR (a) Remove the rear evaporator temperature sensor. (b) Disconnect the connector from the rear evaporator temperature sensor. (c) Measure the resistance according to the value(s) in the table below. Standard re ...

PCS (Pre-Collision System)
When the radar sensor detects possibility of a frontal collision, the pre-collision system such as the brakes and seat belts are automatically engaged to lessen impact as well as vehicle damage. Pre-collision warning When a high possibility of a frontal collision is detected, the pre-colli ...

Suspension system
How to proceed with troubleshooting HINT: This is the repair procedure for vehicle pull. Problem symptoms table FRONT SUSPENSION SYSTEM REAR SUSPENSION SYSTEM ...

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