Acura CSX. Instruction — page 679

SWS DTC Index

SRS Unit DTC

SWS DTC

Detection Item

Notes

24-33

Only read DTCs from the SRS menu, not from the SWS menus unless instructed to check SWS DTCs. SWS (ODS unit)
DTCs are subcodes of SRS unit DTCs. Only troubleshoot the corresponding SRS DTCs.

81-4x

41-xx

Internal failure of the ODS unit

(see page 24-178)

42-xx
43-xx

82-14

14-11

Short to power in the front passenger’s weight
sensor (front inner side) power circuit

(see page 24-179)

14-12

Short to ground in the front passenger’s weight
sensor (front inner side) power circuit

14-13

Open in the front passenger’s weight sensor (front
inner side) output circuit

14-14

Short to ground in the front passenger’s weight
sensor (front inner side) output circuit

82-15

15-3x

Internal failure of the front passenger’s weight
sensor (front inner side)

(see page 24-181)

82-16

16-11

Short to power in the front passenger’s weight
sensor (rear inner side) power circuit

(see page 24-179)

16-12

Short to ground in the front passenger’s weight
sensor (rear inner side) power circuit

16-13

Open in the front passenger’s weight sensor (rear
inner side) output circuit

16-14

Short to ground in the front passenger’s weight
sensor (rear inner side) output circuit

82-17

17-3x

Internal failure of the front passenger’s weight
sensor (rear inner side)

(see page 24-181)

83-24

24-11

Short to power in the front passenger’s weight
sensor (front outer side) power circuit

(see page 24-180)

24-12

Short to ground in the front passenger’s weight
sensor (front outer side) power circuit

24-13

Open in the front passenger’s weight sensor (front
outer side) output circuit

24-14

Short to ground in the front passenger’s weight
sensor (front outer side) output circuit

83-25

25-3x

Internal failure of the front passenger’s weight
sensor (front outer side)

(see page 24-181)

83-26

26-11

Short to power in the front passenger’s weight
sensor (rear outer side) power circuit

(see page 24-180)

26-12

Short to ground in the front passenger’s weight
sensor (rear outer side) power circuit

26-13

Open in the front passenger’s weight sensor (rear
outer side) output circuit

26-14

Short to ground in the front passenger’s weight
sensor (rear outer side) output circuit

83-27

27-3x

Internal failure of the front passenger’s weight
sensor (rear outer side)

(see page 24-181)

81-71

71-xx

ODS unit does not calibrate

(see page 24-178)

NOTE:

The ‘‘x’’ at the end of each DTC denotes a numeric character (0 thru 9) or an alpha character (A thru F) that you
will see on the HDS display. The character is unrelated to your troubleshooting; it designates the SRS unit
manufacturer and other detail used for product analysis.

08/08/21 13:55:32 61SNR030_240_0033

SNR9A00H46400000000HBAT01

Symptom

Diagnostic procedure

Also check for

24-34

SRS

Symptom Troubleshooting Index




SRS indicator does not come on

Symptom Troubleshooting (see page 24-181)

Communication with the
HDS

SRS indicator stays on, but no DTCs
are stored

Symptom Troubleshooting (see page 24-182)

Charging system for
under or overcharging
Communication with the
HDS

Side airbag cutoff indicator flashes

Check the DTC. If a DTC indicated, go to the
DTC troubleshooting

ODS Initialization
Communication with the
HDS

Side airbag cutoff indicator stays on

Symptom Troubleshooting (see page 24-183)

Communication with the
HDS

Side airbag cutoff indicator does not
come on

Symptom Troubleshooting (see page 24-183)

Initialize the ODS unit
Communication with the
HDS

Passenger’s airbag cutoff indicator
flashes

Check the DTC. If a DTC indicated, go to the
DTC troubleshooting

Calibration the ODS unit
Communication with the
HDS

Passenger’s airbag cutoff indicator
stays on or comes on suddenly

Symptom Troubleshooting (see page 24-184)

Communication with the
HDS

Passenger’s airbag cutoff indicator
does not come on

Check the DTC. If a DTC indicated, go to the
DTC troubleshooting

Communication with the
HDS

HDS does not communicate with the
SRS unit or the vehicle

Troubleshoot the DLC circuit (see page
11-204).

Communication with the
HDS

08/08/21 13:55:32 61SNR030_240_0034

01

SNR9A00H46400000000CAAT00

SRS Components

Airbags

Front Passenger’s Weight Sensors

Driver’s Seat Position Sensor

24-35

System Description

A

B

C

D

E

F

M

E

I

G

J

F

L

L

G

H

O

N

The SRS is a safety device which, when used with the seat belt, is designed to help protect the driver and front
passenger in a frontal impact exceeding a certain set limit. The system consists of the SRS unit, including safing
sensor and impact sensor (A), the cable reel (B), the driver’s airbag (C), the front passenger’s airbag (D), side airbags
(E), side curtain airbags (F), seat belt tensioners (G), seat belt buckle tensioners (H), side impact sensors (first) (I), front
impact sensors (J), rear safing sensor (K) and side impact sensors (second) (L).
Since the driver’s and front passenger’s airbags use the same sensors, both normally inflate at the same time.
However, it is possible for only one airbag to inflate. This can occur when collision severity is near the threshold for
airbag deployment. In such cases, the SRS system will only deploy airbags when the protection provided by the seat
belt is insufficient.

The front passenger’s weight sensors (M) are part of seat base. The front passenger’s weight sensors detect the
weight on the seat, and send the information to the ODS unit (N). If the total weight is about 30 kg (65 lbs) or less, the
ODS unit sends a signal to the SRS unit to prevent the passenger’s airbag from deploying. When the passenger’s
airbag is disabled, the passenger airbag cutoff indicator on the center panel comes on to alert the driver that the front
passenger’s airbag will not deploy in a front-end collision.

The driver’s seat position sensor (O) is under the driver’s seat on the left side. When the driver’s seat is moved to its
full forward position, the deployment of the driver’s airbag is moderated to decrease its force of impact during a front-
end collision.

08/08/21 13:55:33 61SNR030_240_0035

Rear Safing Sensor

For the SRS to operate:

Seat Belt Tensioners and Seat Belt Buckle Tensioners

Driver’s and Front Passenger’s Airbag(s)

Side Airbag(s)

Side Curtain Airbag(s)

Side Airbag Cutoff Indicator/OPDS Operation

Passenger Airbag Cutoff Indicator

SRS Operation

24-36

SRS

The rear safing sensor is located under the rear seat. The rear safing sensor performs the same basic function as the
safing sensor in the SRS unit. It measures sideways G force, such as the force the vehicle would receive in a side
collision in the rear, and sends that information to the SRS unit. The SRS unit uses that information, and the
information from the second side impact sensors to determine the side that is impacted and the force. If the threshold
is met, the SRS unit deploys the side airbag, the side curtain airbag, and the seat belt tensioner on that side.

The indicator comes on when the front passenger’s seat is occupied by a small adult or child who is leaning into the
deployment path, or when an object (grocery bag, briefcase, purse, etc.) is in the seat. This indicates the passenger’s
side airbag is off and will not deploy; there is no problem with the side airbag. If the passenger sits upright or moves
to another seat, or you remove the object from the seat, the light should go off. There will be some delay between the
occupant’s repositioning and when the indicator will turn on or off.

The indicator comes on if the weight on the front passenger’s seat is about 30 kg (65 lbs) or less. This indicates the
passenger’s front airbag is off and will not deploy. The front airbag is shut off to reduce the chance of airbag-caused
injuries.

The main circuit in the SRS unit senses and analyzes the force of impact and, if necessary, ignites the inflator charges.
If battery voltage is too low or power is disconnected due to the impact, the voltage regulator and the back-up power
circuit will keep voltage at a constant level.

(1) A front impact sensor, side impact sensor, or the rear safing sensor must activate and send electric signals to the
microprocessor.
(2) The microprocessor must compute the signals and trigger the tensioners.
(3) The charges must ignite and deploy the tensioners.

(1) A front impact sensor must activate and send electric signals to the microprocessor.
(2) The microprocessor must compute the signals and trigger the airbag inflator(s).
(3) The triggered inflators must ignite and deploy the airbags.

(1) A side impact sensor must activate and send electric signals to the microprocessor.
(2) The microprocessor must compute the signals and trigger the side airbag inflator(s). However, the microprocessor
does not trigger the front passenger’s side airbag if the SRS unit determines that the front passenger’s head is in the
deployment path of the side airbag.
(3) The inflator that receives the signal must ignite and deploy the side airbags.

(1) A side impact sensor or the rear safing sensor must activate, and send electrical signals to the microprocessor.
(2) The microprocessor must compute the signals and trigger the side curtain airbag and side airbag inflator(s).
(3) The triggered inflators must ignite and deploy the side curtain airbag and side airbag at the same time.

08/08/21 13:55:33 61SNR030_240_0036

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