Toyota CH-R Service Manual: System Description

Toyota CH-R Service Manual / Supplemental Restraint Systems / Airbag System / System Description

SYSTEM DESCRIPTION

GENERAL

(a) Acceleration sensors and pressure sensors used for the airbag system are installed to various parts on the vehicle and calculate the acceleration rate and pressure of each part during a collision.

(b) Depending on the situation, the airbag sensor assembly sends a deployment signal to SRS parts based on the information from each sensor.

DEPLOYMENT CONDITION

(a) FRONTAL COLLISION

(1) Frontal collision signals are produced based on the information from the airbag sensor assembly and front airbag sensors.

HINT:

In the case of a frontal collision, the SRS deployment signal may be output after receiving an ON signal from the acceleration sensor built into the airbag sensor assembly even without a signal from the front airbag sensors.

(2) Frontal collision signals are used to deploy the SRS parts.

SRS Part		Pretensioner Deployment Judgment		Pretensioner and Airbag Deployment Judgment
SRS Part		LHD	RHD	LHD	RHD
Horn Button Assembly	Driver Side Squib	X	X	○	○
Horn Button Assembly	Driver Side Squib 2nd Step (w/ Occupant Classification System)	X	X	○*2	○*2
Instrument Panel Passenger without Door Airbag Assembly	Front Passenger Side Squib	X	X	○*1	○*1
Instrument Panel Passenger without Door Airbag Assembly	Front Passenger Side Squib 2nd Step (w/ Occupant Classification System)	X	X	○*1	○*1
Lower No. 1 Instrument Panel Airbag Assembly		X	X	○	○
Front Seat Cushion Airbag Assembly RH		X	X	○*1	-
Front Seat Airbag Assembly LH		X	X	○	○
Front Seat Airbag Assembly RH		X	X	○	○
Rear Seat Airbag Assembly LH (w/ Occupant Classification System)		X	X	○	○
Rear Seat Airbag Assembly RH (w/ Occupant Classification System)		X	X	○	○
Curtain Shield Airbag Assembly RH		X	X	○	○
Curtain Shield Airbag Assembly LH		X	X	○	○
Front Seat Outer Belt Assembly LH		○	○	○	○
Front Seat Outer Belt Assembly RH	Front Pretensioner Squib RH	○*1	○	○*1	○
Front Seat Outer Belt Assembly RH	Selectable Force Limiter Squib RH	○*1	-	○*1	-
Rear Seat 3 Point Type Outer Belt Assembly LH		○	○	○	○
Rear Seat 3 Point Type Outer Belt Assembly RH		○	○	○	○

○: Deployable
X: Not Deployable
*1: Deployment depends on airbag cut off switch cylinder sub-assembly condition.
*2: Deployment depends on of driver seat belt condition and seat position.
*3:*Deployment depends on front passenger seat condition.

(b) SIDE COLLISION (Pattern 1)

(1) Side collision (Pattern 1) signals are produced based on the information from the airbag sensor assembly, door side airbag sensor, No. 1 side airbag sensor and floor side airbag sensor.

(2) Side collision (Pattern 1) signals are used to deploy the SRS parts.

SRS Part		Side Collision (Pattern 1) Detected
SRS Part		LH Side Collision	RH Side Collision
Horn Button Assembly	Driver Side Squib	X	X
Horn Button Assembly	Driver Side Squib 2nd Step (w/ Occupant Classification System)	X	X
Instrument Panel Passenger without Door Airbag Assembly	Front Passenger Side Squib	X	X
Instrument Panel Passenger without Door Airbag Assembly	Front Passenger Side Squib 2nd Step (w/ Occupant Classification System)	X	X
Lower No. 1 Instrument Panel Airbag Assembly		X	X
Front Seat Cushion Airbag Assembly RH		X	X
Front Seat Airbag Assembly LH		○	X
Front Seat Airbag Assembly RH		X	○
Rear Seat Airbag Assembly LH (w/ Occupant Classification System)		○	X
Rear Seat Airbag Assembly RH (w/ Occupant Classification System)		X	○
Curtain Shield Airbag Assembly RH		○	X
Curtain Shield Airbag Assembly LH		X	○
Front Seat Outer Belt Assembly LH		○	X
Front Seat Outer Belt Assembly RH	Front Pretensioner Squib RH	X	X
Front Seat Outer Belt Assembly RH	Selectable Force Limiter Squib RH	X	○
Rear Seat 3 Point Type Outer Belt Assembly LH (w/ Occupant Classification System)		○	X
Rear Seat 3 Point Type Outer Belt Assembly RH (w/ Occupant Classification System)		X	○

○: Deployable
X: Not Deployable

(1) Side collision (Pattern 2) signals are produced based on the information from the airbag sensor assembly and No. 2 side airbag sensor.

(2) Side collision (Pattern 2) signals are used to deploy the SRS parts.

SRS Part		Side Collision (Pattern 2) Detected
SRS Part		LH Side Collision	RH Side Collision
Horn Button Assembly	Driver Side Squib	X	X
Horn Button Assembly	Driver Side Squib 2nd Step (w/ Occupant Classification System)	X	X
Instrument Panel Passenger without Door Airbag Assembly	Front Passenger Side Squib	X	X
Instrument Panel Passenger without Door Airbag Assembly	Front Passenger Side Squib 2nd Step (w/ Occupant Classification System)	X	X
Lower No. 1 Instrument Panel Airbag Assembly		X	X
Front Seat Cushion Airbag Assembly RH		X	X
Front Seat Airbag Assembly LH		X	X
Front Seat Airbag Assembly RH		X	X
Rear Seat Airbag Assembly LH (w/ Occupant Classification System)		○	X
Rear Seat Airbag Assembly RH (w/ Occupant Classification System)		X	○
Curtain Shield Airbag Assembly RH		○	X
Curtain Shield Airbag Assembly LH		X	○
Front Seat Outer Belt Assembly LH		X	X
Front Seat Outer Belt Assembly RH	Front Pretensioner Squib RH	X	X
Front Seat Outer Belt Assembly RH	Selectable Force Limiter Squib RH	X	X
Rear Seat 3 Point Type Outer Belt Assembly LH (w/ Occupant Classification System)		○	X
Rear Seat 3 Point Type Outer Belt Assembly RH (w/ Occupant Classification System)		X	○

○: Deployable
X: Not Deployable

System Diagram

SYSTEM DIAGRAM Communication Table Transmitting ECU (Transmitter) Receiving ECU Signal Communication Method Airbag Sensor Assem ...

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