Toyota Sienna Service Manual: Customer problem analysis

Toyota Sienna Service Manual / Introduction / How to troubleshoot ecu controlled systems / How to proceed with troubleshooting / Customer problem analysis

HINT:

In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
Gather as much information as possible for reference.
Past problems that seem unrelated may also help in some cases.
The following 5 items are important points in the problem analysis:

What	Vehicle model, system name
When	Date, time, occurrence frequency
Where	Road conditions
Under what conditions?	Running conditions, driving conditions, weather conditions
How did it happen?	Problem symptoms

Operation flow

HINT: Perform troubleshooting in accordance with the procedures below. The following is an outline of basic troubleshooting procedures. Confirm the troubleshooting procedures for the circuit you a ...

Symptom confirmation and diagnostic trouble code

HINT: The diagnostic system in the SIENNA has various functions. The first function is the Diagnostic Trouble Code (DTC) check. A DTC is a code stored in the ECU memory whenever a malfunctio ...

Other materials:

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

Reassembly
1. INSTALL POWER SLIDE DOOR TOUCH SENSOR LH Install the touch sensor with the 4 screws. Connect the connector. Fix the wire harness inside the door panel with the clip. 2. INSTALL REAR DOOR WIRE SUB-ASSEMBLY LH Install the wire. NOTICE: When installing the wire, push the ...

Removal
1. REMOVE REAR WINDOW SIDE GARNISH ASSEMBLY 2. REMOVE REAR DOOR WINDOW FRAME SUBASSEMBLY 3. REMOVE SIDE TRIM BOARD COVER REAR 4. REMOVE REAR DOOR TRIM BOARD SUBASSEMBLY 5. REMOVE REAR DOOR GLASS RUN 6. REMOVE SLIDE DOOR WINDOW ASSEMBLY 7. REMOVE REAR DOOR GLASS WEATHERSTRIP Put pro ...