Toyota Sienna Service Manual: How to troubleshoot ecu controlled systems

Vehicle lift and support locations

1. NOTICE ABOUT VEHICLE CONDITION WHEN JACKING UP VEHICLE (a) The vehicle must be unloaded before jacking up/ lifting up the vehicle. Never jack up/lift up a heavily loaded vehicle. (b) When re ...

General information

A large number of ECU controlled systems are used in the SIENNA. In general, ECU controlled systems are considered to be very intricate, requiring a high level of technical knowledge to troubleshoo ...

Other materials:

No. 1 Speaker with box
COMPONENTS ON-VEHICLE INSPECTION 1. INSPECT NO.1 SPEAKER WITH BOX HINT: Remove interior parts so that the No.1 speaker with box can be seen.  Check the speaker installation. OK: The speaker is securely installed. If the result is not as specified, reinstall the No.1 s ...

Installation
1. INSTALL NO.1 NAVIGATION BRACKET  Install the No.1 navigation bracket with the 4 screws. 2. INSTALL NO.2 NAVIGATION BRACKET  Install the No.2 navigation bracket with the 4 screws. 3. INSTALL INSTRUMENT CLUSTER FINISH PANEL UPPER  Install the instrum ...

Washer Signal Circuit
DESCRIPTION The distance control ECU detects washer operation. The cruise control will be cancelled by the distance control ECU if the windshield wipers operate in the HI or LO mode. By detecting washer operation, the distance control ECU allows the cruise control to continue even when the ...