Toyota Sienna Service Manual: Diagnosis system
1. BUS CHECK
- Select "BUS CHECK" from the "OBD/MOBD MENU" screen.
HINT: The ECUs and sensors that are properly connected to the CAN communication system can be displayed using the intelligent tester via the CAN VIM.
- Press "ENTER" on the intelligent tester.
- The screen displays the ECUs and sensors that are properly connected to the CAN communication system.
HINT: Properly connected ECUs or sensors that are not displayed on the screen indicate that a communication stop is occuring in the system, sensor, or ECU which is not displayed.
2. CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION
- Systems (ECUs, sensors) that use CAN communication vary depending on the vehicle's optional equipment. Check which systems (ECUs, sensors) are installed on the vehicle.
HINT:
- *1: with VSC
- *2: with Dynamic laser cruise control
3. DTC TABLE BY ECU
HINT:
- For the CAN communication system, CAN communication system DTCs stored in certain ECUs can be displayed using the intelligent tester.
- If CAN communication system DTCs are output,
trouble cannot be determined only by the DTCs.
Perform troubleshooting according to "CHECK CAN BUS LINE" (See page CA-35).
- Skid control ECU (with VSC)
HINT: DTC communication uses the CAN communication system.
- ECM (with Dynamic laser cruise control)
HINT:
- DTC communication uses the CAN communication system.
- Distance control ECU data is output.
- Displayed on the "communication malfunction DTCs" screen of the intelligent tester. If U0235 or U1102 is output alone, the CAN communication is normal
- Gateway ECU
HINT: The network gateway ECU is connected to the CAN communication system, but CAN communication DTCs are not output.
4. DTCS COMBINATION TABLE
HINT: *1: with Dynamic laser cruise control
Terminals of ECU
1. JUNCTION CONNECTOR
Junction connector
with VSC
HINT:
*1: with Dynamic laser cruise control
without VSC
CAN junction connector (with VSC)
with VSC
The connection ...
Fail-safe chart
1. FAIL-SAFE FUNCTION
When communication fails in any of the main wires
(communication lines) due to a short circuit or other
causes, the fail-safe function, which is specified for
each syst ...
Other materials:
Moving a second seat for third seat access
Getting in the vehicle
Tip-up seats
Pull the seatback angle adjustment
lever and fold down the
seatback. The cushion will tip
up. The seat can slide forward.
Move the seat to the frontmost
position.
Ottoman seats
Pull the seatback angle adjustment
lever and fold down th ...
Problem symptoms table
RESULT LIST OF CHECK CAN BUS LINE
Symptom
Suspected Area
All ECUs and sensors connected to the CAN
communication system are not displayed on intelligent
tester
CAN Bus Line
The result of "CAN BUS WIRE CHECK" is "Open in
CAN Main Bus Lin ...
Rear Occupant Classification Sensor LH Collision
Detection
DTC B1787 Rear Occupant Classification Sensor LH Collision
Detection
DESCRIPTION
DTC B1787 is output when the occupant classification ECU receives a collision
detection signal sent by
the rear occupant classification sensor LH if an accident occurs.
DTC B1787 is also output when the front s ...
