Toyota Sienna Service Manual: Electronic circuit inspection procedure

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 ...

Basic inspection

(a) WHEN MEASURING RESISTANCE OF ELECTRONIC PARTS (1) Unless otherwise stated, all resistance measurements should be made at an ambient temperature of 20°C (68°F). Resistance measurements may b ...

Other materials:

On-vehicle inspection
1. INSPECT STEERING PAD (VEHICLE NOT INVOLVED IN COLLISION)  Perform a diagnostic system check. With the steering pad installed on the vehicle, perform a visual check. If there are any defects as mentioned below, replace the steering pad with a new one: Cuts, minute cracks or ...

Jam Protection Function Activates During Power Back Door Operation
DESCRIPTION It may be caused by ill-fitting back door, faulty touch sensor or faulty pulse sensor. The power back door ECU activates the back motor to open / close the power back door, thus controlling the power back door operation. For jam and foreign object detection, the power ba ...

Terminals of ECU
1. CHECK POWER SLIDE DOOR ECU LH (WITH POWER SLIDE DOOR) Disconnect the P25 and P26 ECU connectors, and check the voltage and resistance of each terminal of the wire harness side connectors. If the result is not as specified, there may be a malfunction on the wire harness side. ...