Honda Element. Manual - part 98

total weight is about 65 lbs (30 kg) or less, the ODS unit sends a signal to the SRS unit to prevent the front 
passenger's airbag from deploying. When the front 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. 

Driver's Seat Position Sensor 

The driver's seat position sensor (P) 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. 

Fig. 41: Identifying SRS Components 

Roll Rate Sensor 

The roll rate sensor is located under the front passenger's seat. It detects the amount of roll of the vehicle and 
sends the information to the SRS unit. The SRS unit uses this information to determine if a vehicle rollover is 
imminent. If so, it deploys both side curtain airbags and the front seat belt tensioners. 

Rear Safing Sensor 

The rear safing sensor is located under the center console. 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. 

SIDE AIRBAG CUTOFF INDICATOR/ODS OPERATION 

 

2007 Honda Element EX 

2007-08 RESTRAINTS SRS (Supplemental Restraint System) - Element

  

The indicator comes on if the front passenger's seat is occupied by a small adult or child who is leaning into the 
deployment path, or an object (grocery bag, briefcase, purse, etc.) is in the seat. When the indicator comes on, 
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. 

PASSENGER AIRBAG CUTOFF INDICATOR 

The indicator comes on if the weight of the front passenger is about 65 lbs (30 kg) 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. 

SRS OPERATION 

The main circuit in the SRS unit senses and judges 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. 

For the SRS to operate: 

Seat Belt Tensioners and Seat Belt Buckle Tensioners 

1. A front impact sensor or side impact sensor must activate and send electric signals to the microprocessor. 

2. The microprocessor must compute the signals and send them to the tensioners.  

3. The charges must ignite and deploy the tensioners.  

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

1. A front impact sensor must activate and send electric signals to the microprocessor.  

2. The microprocessor must compute the signals and send them to the airbag inflator(s).  

3. The inflators that receives signals must ignite and deploy the airbags.  

Side Airbag(s) 

1. Aside impact sensor must activate and send electric signals to the microprocessor.  

2. The microprocessor must compute the signals and send them to the side airbag inflator(s). However, the 

microprocessor cuts off the signals to 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 airbag.  

Side Curtain Airbag(s) 

1. Side impact sensor must activate and send electrical signals to the microprocessor.  

2. The microprocessor must compute the signals and send them to the side curtain airbag and side airbag 

inflator(s).  

3. The inflator that receives the signals must ignite and deploy the side curtain airbag and side airbag at the 

 

2007 Honda Element EX 

2007-08 RESTRAINTS SRS (Supplemental Restraint System) - Element

  

same time.  

Fig. 42: SRS Communication Diagram 

Self-Diagnostic System 

A self-diagnostic circuit is built into the SRS unit; when the ignition switch is turned ON (II), the SRS indicator 
comes on and goes off after about 6 seconds if the system is operating normally. 

If the indicator does not come on, or does not go off after 6 seconds, or if it comes on while driving, it indicates 
an abnormality in the system. The system must be inspected and repaired as soon as possible. 

For better serviceability, the SRS unit memory stores a DTC that relates to the cause of the malfunction, and the 
unit is connected to the data link connector (DLC). This information can be read with the HDS when it is 
connected to the DLC (see GENERAL TROUBLESHOOTING INFORMATION ). 

SRS UNIT INPUTS AND OUTPUTS AT CONNECTOR A (28P) 

NOTE:

Before you disconnect the negative cable from the battery for troubleshooting, 
make sure you have the anti-theft code for the audio system.

 

2007 Honda Element EX 

2007-08 RESTRAINTS SRS (Supplemental Restraint System) - Element

  

Fig. 43: Identifying SRS Unit Connector A (28P) Terminals 

TERMINALS DESCRIPTION CHART (SRS UNIT CONNECTOR A (28P)) 

SRS UNIT INPUTS AND OUTPUTS AT CONNECTOR B (28P) 

Terminal 

Number

Wire Color

Terminal 

Name

Description

1

GRN/YEL

LA2+

Power source for driver's airbag second inflator

2

GRN/WHT

LA2-

Ground for driver's airbag second inflator

3

BLU/BLK

RA2+

Power source for front passenger's airbag second inflator

4

BLU/RED

RA2-

Ground for front passenger's airbag second inflator

5

LT 

GRIM/BLK

MES

Memory erase signal input

6

BRN

SCS

Service check signal input

7

GRN/BLK

LA1 +

Power source for driver's airbag first inflator

8

GRN/RED

LA1-

Ground for driver's airbag first inflator

9

YEL

RA1 +

Power source for front passenger's airbag first inflator

10

BLU/YEL

RA1-

Ground for front passenger's airbag first inflator

11

GRN

IDC

SRS indicator output line

12

RED/BLU

PTT

Passenger's airbag cutoff indicator output line

14

GRN/ORN

ODS

Sends and receives communication signal

15

BLU

LFS-

Ground for left front impact sensor

16

BRN

RFS-

Ground for right front impact sensor

17

BLK/YEL

VA

SRS system sub power (common with ODS and 
passenger's cutoff indicator)

18

WHT/RED

VB

SRS dedicated power (dedicated booster circuit)

21

YEL

CDS

Front passenger's occupant detection signal output line

22

BLK

SRS GND (1) Ground circuit for the SRS unit

23

BLK

SRS GND (2) Ground circuit for the SRS unit

24

LT BLU

K-LINE

Sends and receives scan tool signal

27

RED

LFS+

Power source for left front impact sensor

28

GRN

RFS+

Power source for right front impact sensor

 

2007 Honda Element EX 

2007-08 RESTRAINTS SRS (Supplemental Restraint System) - Element