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Toyota Sienna Service Manual: How to proceed with troubleshooting

HINT: Troubleshoot in accordance with the procedures on the following pages.

1 VEHICLE BROUGHT TO WORKSHOP

2 CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK

3 INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN)

  1. Use the intelligent tester to check for normal function of the multiplex communication system.
  1. (ECU unconnected, communication line malfunctioning) Without code outputs, proceed to A.
  2. (ECU unconnected, communication line malfunctioning) With code outputs, proceed to B.

4 DTC CHECK

  1. Check for a diagnostic trouble code.
  1. Without code outputs, proceed to A.
  2. With code outputs, proceed to B.

5 PROBLEM SYMPTOMS TABLE

  1. When problem is not listed on problem symptoms table, proceed to A.
  2. When problem is listed on problem symptoms table, proceed to B.

6 PERFORM TROUBLESHOOTING ACCORDING TO MALFUNCTION SYMPTOM

  1. Data List / Active Test .
  2. Operation check .
  3. Inspection.
  4. Terminals of ECU

7 ADJUST, REPAIR OR REPLACE

8 RESET POWER BACK DOOR SYSTEM

9 CONFIRMATION TEST

END

Power back door system
PARTS LOCATION ...

Operation check
NOTICE: Inspection should be started after conforming that the items listed in the "CUSTOMIZE PARAMETER" for the power back door system have defaulted to the initial settings 1. CHECK ...

Other materials:

Data list / active test
1. DATA LIST HINT: Using the DATA LIST displayed on the intelligent tester, you can read the value of the switch, sensor, actuator, etc. without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten the labor time.  Connect the intelligent tes ...

Installation
1. INSTALL SEAT POSITION AIRBAG SENSOR  Check that the ignition switch is off. Check that the negative battery (-) terminal is disconnected. CAUTION: After disconnecting the negative battery terminal, wait for at least 90 seconds before starting the operation.  Usin ...

Illumination Circuit
DESCRIPTION The Multiplex network body ECU controls illumination light as shown in the chart below.  Room light assembly (Interior light, luggage component light) and courtesy light with DOOR position  Map light assembly (Personal light) Transponder key amplifier (Ignition ke ...

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