Sienna FWD V6-3.3L (3MZ-FE) (2006)
Seat Occupant Sensor: Symptom Related Diagnostic Procedures
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
Problem Symptoms Table - Occupant Classification System
HINT: Proceed to the troubleshooting for each circuit in the table.
Symptom Simulation
SYMPTOM SIMULATION
HINT: The most difficult case in troubleshooting is when no symptoms occur. In such cases, a thorough customer problem analysis must be carried out.
Then the same or similar conditions and environment in which the problem occurred in the customer's vehicle should be simulated. No matter how
experienced or skilled a technician may be, if he proceeds to troubleshoot without confirming the problem symptoms, he will likely overlook something
important and make a wrong guess at some points in the repair operation.
This leads to a standstill in troubleshooting.
a. Vibration method: When vibration seems to be the major cause.
HINT: Perform the simulation method only during the primary check period (for approximately 6 seconds after the ignition switch is turned
to the ON position).
1. Slightly vibrate the part of the sensor considered to be the problem cause with your fingers and check whether the malfunction occurs.
HINT: Shaking the relays too strongly may result in open relays.
2. Slightly shake the connector vertically and horizontally.
3. Slightly shake the wire harness vertically and horizontally.
The connector joint and fulcrum of the vibration are the major areas to be checked thoroughly.
b. Simulation method for DTC B1795: Turn the ignition switch from the LOCK to the ON position, hold for 10 seconds, and then back to the
LOCK position again 50 times in a row.