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
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