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:

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)

1. 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

1. Terminals of ECU
2.  DATA LIST/ACTIVE TEST

7 REPAIR OR REPLACE

8 CONFIRMATION TEST

END