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:
Door Courtesy Switch Circuit
DESCRIPTION
The Multiplex network body ECU detects the condition of the door courtesy
switch assembly.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 READ VALUE OF INTELLIGENT TESTER
Connect the intelligent tester to DLC3.
Turn the ignition switch to ON and push the intelligent
tester ...
Air outlet control servo motor
ON-VEHICLE INSPECTION
1. INSPECT AIR OUTLET CONTROL SERVO MOTOR
(a) Remove the air outlet control servo motor.
(b) Connect the positive (+) lead from the battery to
terminal 4 and negative (-) lead to terminal 5, then
check that the lever turns to "DEF" position.
(c) Connect ...
VC Output Circuit
DESCRIPTION
The ECM constantly uses 5 V from the battery voltages supplied to the +B
(BATT) terminal to operate the
microprocessor. The ECM also provides this power to the sensors through the VC
output circuit.
When the VC circuit is short-circuited, the microprocessor in the ECM and
sens ...
