Toyota Tacoma 2015-2018 Service Manual: System Description

Toyota Tacoma 2015-2018 Service Manual / Supplemental Restraint Systems / Airbag System / 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.

(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.

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:

Dtc Check / Clear
DTC CHECK / CLEAR 1. CHECK DTC (for TIRE PRESSURE WARNING ECU AND RECEIVER) (USING TECHSTREAM) (a) Turn the ignition switch off. (b) Connect the Techstream to the DLC3. (c) Turn the ignition switch to ON. (d) Turn the Techstream on. (e) Enter the following menus: Chassis / Tire Pressure Monito ...

Removal
REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH side and LH side. The following procedure is for the LH side. PROCEDURE 1. PRECAUTION NOTICE: After turning the ignition switch off, waiting time may be required before disconnecting the cable from the ...

Check Bus 2 Lines for Short Circuit
DESCRIPTION There may be a short circuit between the CAN main bus lines and/or CAN branch lines when the resistance between terminals 18 (CA4H) and 17 (CA4L) of the central gateway ECU (network gateway ECU) is below 54 Ω. Detection Item Trouble Area Resi ...