Toyota Tacoma 2015-2018 Service Manual: System Description
SYSTEM DESCRIPTION
1. FRONT PASSENGER OCCUPANT CLASSIFICATION SYSTEM
(a) General Description
(1) The front passenger occupant detection ECU determines whether the front passenger seat is occupied by an adult or child (with child seat) or is unoccupied, based on the load that is applied to the front passenger seat and whether the seat belt is buckled. The system restricts the deployment of the front passenger airbag, front passenger side airbag, and the front passenger seat belt pretensioner in accordance with this judgment. The result is informed to the driver through the airbag ON/OFF indicator illumination.
(b) System Configuration
(1) This system consists of the occupant detection ECU, occupant classification sensors, airbag ON/OFF indicator, seat belt buckle switches, and airbag sensor assembly.
(c) Occupant Detection ECU and Sensor
(1) The occupant classification sensors are installed on four brackets connecting the seat rail and the seat frame. The resistance values of these sensors, which vary in accordance with the load that acts on the brackets, are transmitted to the occupant detection ECU as signals. Upon receipt of the signals, the ECU determines the front passenger seat occupant conditions.
Initialization
INITIALIZATION
1. ZERO POINT CALIBRATION
NOTICE:
Make sure that the front passenger seat is not occupied before performing the
operation.
HINT:
Perform the zero point calibration and sensitivit ...
System Diagram
SYSTEM DIAGRAM
...
Other materials:
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
(a) This is a method to specify trouble areas by using a manifold gauge set.
Read the manifold gauge pressure when the following conditions are established.
Test conditions:
Engine has been warmed u ...
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the
table. Check each sy ...
Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) (P0748)
DESCRIPTION
Changing from 1st to 6th is performed by the ECM turning shift solenoid valves
SL1, SL2, SL3 and SL4 on and off. If an open or short circuit occurs in any of the
shift solenoid valves, the ECM controls the remaining normal shift solenoid valves
to allow the vehicle to be operated ...