Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: System Description

SYSTEM DESCRIPTION

1. SRS (SUPPLEMENTAL RESTRAINT SYSTEM) AIRBAG SYSTEM

(a) General Description

(1) The SRS airbag system consists of the following airbag and main components:

Airbag

Access Cab Model

Double Cab Model

Driver Airbag

Standard

Standard

Front Passenger Airbag

Standard

Standard

Knee Airbag

Standard

Standard

Side Airbag

Standard

Standard

Curtain Shield Airbag

Standard

Standard

Main Components

Features

Airbag Sensor Assembly

  • Controls airbag deployment
  • Activates dual stage control for driver and front passenger airbags
  • Detects malfunctions in SRS airbag system

Occupant Detection ECU

Determines front passenger seat occupant conditions through occupant classification sensors

Front Airbag Sensor

Detect intensity of frontal collisions though electrical deceleration sensor

Side Airbag Sensor Assembly

Detect intensity of side collision through electrical deceleration sensor

Rear Airbag Sensor

Detect intensity of side rear collision through electrical deceleration sensor

Occupant Classification Sensors

Detect occupant weight on front passenger seat

Seat Position Airbag Sensor

Detects driver seat position

Seat Belt Buckle Switches

Detect whether of not seat belt fastened

Airbag ON/OFF Indicator

Illuminates ON or OFF light to indicate front and side passenger airbag deployment availability

SRS Warning Light

Illuminates to indicate existence of malfunctions in SRS airbag system

2. AIRBAG DEPLOYMENT

(a) Front Collisions

(1) The driver and front passenger airbags are in case of frontal collisions. These airbags deploy by dual stage control. In order to activate dual stage control, the airbag sensor assembly monitors the following information through the components shown in the table below:

Seat

Information

Models with Separate Seat

Driver

Intensity of Impact

Same As Left

Driver

Driver Seat Position

Same As Left

Driver

Seat Belt Position

Same As Left

Front Passenger

Intensity of Impact

Same As Left

Front Passenger

Occupant Weight

Four Occupant Classification Sensors

Front Passenger

Seat Belt Condition

Same As Left

(b) Side Collisions

(1) The side and curtain shield airbags are in case of side collisions. The side airbags are installed in the seat backs of the driver seat and the front passenger seat, and the curtain shield airbags are installed in the upper areas of the right and left center pillars. If a side airbag sensor assembly detects an impact, the airbag sensor assembly causes the side and curtain shield airbags to be deployed simultaneously.

(c) Rear Side Collisions

(c) Rear Side Collisions

(1) The side and curtain shield airbags are in case of rear side collisions. The side airbags are installed in the seat backs of the driver seat and the front passenger seat, and the curtain shield airbags are installed in the upper areas of the right and left center pillars. If a side airbag sensor assembly detects an impact, the airbag sensor assembly causes the side and curtain shield airbags to be deployed simultaneously.

Check Mode Procedure
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 lis ...

Check Mode Procedure
CHECK MODE PROCEDURE 1. Check Mode (Signal Check): DTC CHECK (a) Connect the Techstream to the DLC3. (b) Turn the ignition switch to ON and turn the Techstream on. (c) Select the Signal Check on t ...

Other materials:

Tire Pressure Warning Light Circuit
DESCRIPTION If the tire pressure warning ECU and receiver detects any problems, the tire pressure warning light blinks for 1 minute then illuminates, and tire pressure monitoring is disabled at the same time. At this time, the ECU stores a DTC in memory. Connecting terminals TC and CG of the D ...

Air Fuel Ratio Sensor
Components COMPONENTS ILLUSTRATION Removal REMOVAL PROCEDURE 1. REMOVE AIR FUEL RATIO SENSOR (for Bank 1 Sensor 1) (a) Disconnect the air fuel ratio sensor connector. (b) Disengage the clamp to separate the air fuel ratio sensor wire ...

Lost Communication with ECM / PCM "A" (U0100,U0125,U0126,U0129)
DESCRIPTION These DTCs are stored when a communication malfunction occurs between ECUs that perform pre-collision system control. DTC No. Detection Item DTC Detection Condition Trouble Area U0100 Lost Communication with ECM ...

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