Toyota Sienna Service Manual: How to proceed with troubleshooting
HINT:
- Use this procedure to troubleshoot the front power seat control system.
- The intelligent tester should be used in steps 3 and 5.
1 VEHICLE BROUGHT TO WORKSHOP
2 CUSTOMER PROBLEM ANALYSIS CHECK AND PROBLEM SYMPTOM CHECK
3 CHECK COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)
- Use the intelligent tester to check for normal function of the multiplex communication system.
- (Position control ECU and switch assembly (power seat control switch and ECU) not connected, communication line malfunctioning) If no code is output, proceed to A.
- (Position control ECU and switch assembly (power seat control switch and ECU) not connected, communication line malfunctioning) If any code is output, proceed to B.
4 PROBLEM SYMPTOMS TABLE
- If the fault is not listed on the problem symptoms table, proceed to A.
- If the fault is listed on the problem symptoms table, proceed to B.
5 OVERALL ANALYSIS AND TROUBLESHOOTING
- DATA LIST/ACTIVE TEST.
- Inspection with the intelligent tester (DATA LIST).
- Inspection with the intelligent tester (ACTIVE TEST).
- Terminals of ECU.
- Inspection.
6 ADJUST, REPAIR OR REPLACE
7 CONFIRMATION TEST
END
System description
1. GENERAL DESCRIPTION
The power seat control system is equipped with the
following function:
The front seats are equipped with electric
adjuster slide, reclining, lifter, fr ...
Problem symptoms table
HINT:
Inspect the fuse and relay before confirming the suspected
areas in the table below.
Inspect each suspected area in numerical order for the
corresponding symptom.
If the ...
Other materials:
Pressure Control Solenoid "B" Electrical (Shift
Solenoid Valve SL2)
DESCRIPTION
Shifting from 1st to 5th is performed in combination with "ON" and "OFF"
operation of the shift solenoid
valves SL1, SL2, SL3, S4 and SR which are controlled by the ECM. If an open or
short circuit occurs in
either of the shift solenoid valves, the ECM cont ...
For vehicles equipped with catalytic converter
CAUTION: If a large amount of unburned gasoline or gasoline vapors flow
into the converter, it may cause overheating and create a fire hazard. To
prevent this, observe the following precautions:
(a) Use only unleaded gasoline.
(b) Avoid idling the engine for more than 20 minutes.
(c) ...
System description
1. GENERAL
The dynamic laser cruise control system has two
cruise control modes: the constant speed control
mode and vehicle-to-vehicle distance control mode.
The vehicle-to-vehicle distance control mode is
always selected when starting the dynamic laser
cruise control ...
