Toyota Sienna Service Manual: How to proceed with troubleshooting
HINT:
- Use these procedures to troubleshoot the power door lock control system.
- The intelligent tester should be used in steps 4 and 5.
1 VEHICLE BROUGHT TO WORKSHOP
2 CUSTOMER PROBLEM ANALYSIS CHECK
HINT:
- In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
- Gather as much information as possible for reference.
Past problems that seem unrelated may also help in some cases.
- The following 5 items are important points in the problem analysis:
| What | Vehicle model, system name |
| When | Date, time, occurrence frequency |
| Where | Road conditions |
| Under what conditions? | Running conditions, driving conditions, weather conditions |
| How did it happen? | Problem symptoms |
3 INSPECT BATTERY VOLTAGE
Standard Voltage: 11 to 14 V If the voltage is below 11 V, recharge or replace the battery before proceeding.
4 INSPECT COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)
- Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally
Result
5 PROBLEM SYMPTOMS TABLE
Result
6 OVERALL ANALYSIS AND TROUBLESHOOTING
- Terminals of ECU
- DATA LIST/ACTIVE TEST
7 REPAIR OR REPLACE
8 CONFIRMATION TEST
END
System description
1. POWER MIRROR CONTROL SYSTEM DESCRIPTION
This system has these functions: automatic glare-resistant
electrochromic (EC) mirror, electrical remote control type
mirror, memory function, foot light ...
Problem symptoms table
HINT:
Use the table below to help determine the cause of the
problem symptoms. The potential causes of the symptoms
are listed in order of probability in the ''Suspected Area''
column ...
Other materials:
Problem symptoms table
HINT:
Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms
are listed in order of probability in the "Suspected Area"
column of the table. Check each symptom by checking the
suspected areas in the order they are listed. Re ...
Memory Switch Circuit
DESCRIPTION
When the seat memory switch M1 or M2 is pressed, the position control ECU &
switch (Seat ECU)
transmits a signal of the memorized mirror position to the outer mirror control
ECU. Then, the outer mirror
control ECU drives the mirror motor.
HINT:
The power mirror control syste ...
Problem symptoms table
Use the table below to find the cause of the problem. The
numbers indicate the priority of the likely cause of the
problem. Check each part in order. If necessary, replace
these parts.
Front A/C:
Rear A/C:
...
