ERS HONDA CIVIC 2003 7.G Workshop Manual

Seat Belts
Inspection (cont'd)
RetraEtor, Rear Center
1. Before installing the retractor, check that the seat
belt can be pulled out freely.
2, Make sure that the seat belt does not lock when the
retractor (A) is leaned slowly up to 15' from the
mounted position.
lnsideForward
3,
4.
Lean the retractor over 40', and make sure that the
seat belt does not lock when pulled out over 900
mm (35.4 in.). Do not aftempt to disassemble the
retractor.
Replace the seat belt with a new assembly if there
is any abnormality. Do not disassemble any part of
the seat belt for any reason.
23-10
\,J
In-vehicle
1. Check that the seat belt is not twisted or caught on
anything.
2. After installing the anchors. check for free
movement on the anchor bolts. lf necessary,
remove the anchor bolts and check that the
washers and other parts are not damaged or
improperly installed.
3. Check the seat belts for damage or discoloration.
Clean with a shop towel if necessary. Use only
soap and water to clean.
NOTE: Dirt build-up in the loops of the upper
anchors can cause the seat belts to retract slowly.
Wipe the inside of the loops with a clean cloth
dampened in lsopropyl alcohol.
Check that the seat belt does not lock when pulled
out slowly. The seat belt is designed to lock only
during a sudden stop or impact.
For rear center shoulder belt, check that the seat
belt locks when pulled out over 400 mm (15.7 in.)
with the seat-back folded down.
Make sure that the seat belt will retract
automatically when released.
For each passenger's seat belt, check the seat belt
retractor locking mechanism ALR (automatic
locking retractor). This function is for securing child
seats.
-1 Pullthe seat belt allthe way outto engage the
ALR. The seat belt should retract with a
ratcheting sound, but not extend. This is
normal.
-2 To disengage the ALR, release the seat belt and
allow itto fully retract, then pullthe seat belt
out part-way. The seat belt should retract and
extend normally.
Replace the seat belt with a new assembly if there
is any abnormality. Do not disassemble any part of
the seat belt for any reason.
7.
8.

IChild Seat Tether Anchor RemovaUlnstallation
Middle
1. Remove the child seat tether anchor cover (A) in
the rear trim panel (B).
8 x 1.25 mm22 N m {2.2 ksf.m, 16lbf.ft)
,tltl
v\
2.
3.
Remove the anchor bolt (C), then remove the child
seat tether anchor (D). Do not remove the toothed
washer (E) from the tether anchor.
Installthe anchor in the reverse order of removal.
IJ
23-11
Side
1. Remove the rear bulkhead covers from both sides
(see page 20-51).
2. Remove the anchor bolt (A), then remove the child
seat tether anchor (B) from behind the seat-back on
each side ofthe cargo compartment. Do not
remove the toothed washer (C) from the tether
anchor.
AI18 x 1.25 mm22 N.m {2.2 kgt m. 16lbfft)
lnstallthe anchors in the reverse order of removal.
f-..- t".i..].-

sRs
Precautions and Procedures {cont'dl
SRS Unit, Front lmpact Sensors, and Side
lmpact Sensors
. Be careful not to bump or impact the SRS unit, front
impact sensors, or side impact sensors whenever the
ignition switch is ON (ll), or for at least 3 minules after
the ignition switch is turned OFF.
. During installation orreplacement, be careful notto
bump (by impact wrench, hammer, etc.) the area
around the SRS unit, front impact sensors, and sjde
impact sensor. The airbags could accidentally deploy
and cause damage or injury.
After a collision in which any airbags or seat belt
tensioners were deployed. replace the SRS unit, front
impact sensors, and other related components (see
page 23-112). After a collision in which a side airbag
was deployed. replace the side impact sensor on the
deployed side and the SRS unit. After a collision in
which the airbags or the side airbags did not deploy,
inspect for any damage or any deformation on the
SRS unit, front impact sensors, and the side impact
sensors. lf there is any damage, replace the SRS unit
and/or the sensors.
23-16
.j
. Do not disassemble the SRS unit, front impact sensors,
or side impact sensors.
. Turn the ignition switch OFF, disconnect the battery
negative cable, and wait at least 3 minules before
beginning installation or replacement of the SBS unit,
or disconnecting the connectors from the SRS unit.
. Be sure the SRS unit, front impact sensors, and side
impact sensors are installed securely. with the
mounting bolts torqued to 9.8 N.m (1.0 kgf.m,7.2 lbf.ft)
. Do not spill wateroroil on the SRS unit, front impact
sensors, or the side impact sensors, and keep them
away from dust.
. Store the SRS unit, front imDact sensors and side
impact sensors in a cool (less than 104"F/40'C) and
dry (less than 80 % relative humidity, no moisture)
area.
I

Backprobing Spring-loaded Lock Connectors
When checking voltage or resistance on this type of
connector the first time, you must remove the retainer
to insert the tester orobe from the wire side.
NOTE: lt is not necessary to reinstall the removed
retainer;the terminals will stay locked in the connector
housrno.
A
To remove the retainer (A), insert a flat-tip screwdriver
(B) between the connector body and the retainer, then
carefully pry out the retainer. Take care not to break the
connector.
Seats with Side Airbags
Seats with side airbags have a "SIDE AIRBAG" label on
the seat-back. Because the component pans (seat-back
cover, cushion, etc.) of seats with and without airbags
are different, make sure you install only the correct
replacement parts.
When cleaning, do notsaturatethe seatwith liquid,
and do not sDrav steam on the seal
Do not reoalr a torn or fraved seat-back cover.
ReDlace the seat-back cover.
After a collision in which the side airbag was
deployed, replace the side airbag with new parts. lf
the seat-back cushion is split, it must be replaced. lf
the seat-back frame is deformed, it must be replaced.
Never put aftermarket accessories on the seat {covers,
pads, seat heaters, lights, etc.).
(cont'd)
23-19

sRs
Precautions and Procedures (cont'dl
Disconnecting System Connectors
Before removing a front airbag. side airbag, or other SRS related devices {the SRS unit, the cable reel, the front impact
sensors, the side impact sensors, the seat belt buckle tensioners, and the seat belt tensioner connector), disconnectingconnectors from related devices, or removing the dashboard or the steering column, disconnect the airbag connectorsor the side airbag connectors to prevent accidental deploVment.
Turn the ignition switch OFF, disconnect the negative cable from the battery, and wait at least 3 minutes before
beginning the following procedures.'BeforedisconnectingSRSunitconnectorA(1)fromtheSRSunit,disconnectthedriver'sairbag4Pconnector(3).
the front passenger's airbag 4P connector (4), the driver's seat belt tensioner 2P connector (6), and the frontpassenger's seat belt tensioner 2P connector (7).
. Before disconnecting SRS unit connector B (8) from the SRS unit, disconnect both side airbag 2P connectors (11. '12),
and both seat belt buckle tensioner 4P connectors (9, 10).. Before disconnecting the cable reel 4P connector (2), disconnect the driver's airbag 4P connector (3).'Beforedisconnectingthefloorwireharness4Pconnector(5),disconnectbothseatbelttensioner2Pconnectors
(6.7).
23-20
\.

IJ
lr
DTCDetection ltemNotes9-1Internal failure of the SRS unit. lf intermittent, it could mean internalfailure of the unit or a faulty indicator circuit. Refer toTroubleshooting Intermittent Failures (see page 23-26).
NOTE: Before troubleshooting DTC 9-1 or 9-2, check battery/systemvoltage. lf the voltage is low, repair the charging system beforetroubleshooting the SRS.
(see page 23-69)
9-2Internal failure of the SRS unit. lf intermittent, it could mean internalfailu re of the power supply (VB line). Refer to TroubleshootingIntermittent Failures (see page 23-26).
NOTE: Before troubleshooting DTC 9-1 or 9-2, check battery/systemvoltage. lf the voltage is low, repair the charging system or replacethe b€ttery before troubleshooting the SRS.
9-3Faulty driver's seat belt buckle switch(see Daqe 23-71)9-4
9-6
FaultLtglt passenger's seat belt buckle switch
Faulty Ieft front imDact sensorlgqgfage 23-74)
{see Daqe 23-77)9-7Faulty right front impact sensor(see paqe 23-79)10-1Seat belt and seat belt buckle tensioners (and airbag(s)) deployedDriver's side airbag deployed
Seat belt and seat belt buckle tensioners (and airbag(s)) and driver'sside airbag deployed
Front passenqer's side airbao deDloved
(see page 23-69)10-2
r0-3
'10-4
'10-5Seat belt and seat belt buckle tensioners (and airbag(s)) and frontpassenqer's side airbaq deDloved
10-6Driver's and front passenqer's side al10-7Seat belt and seat belt buckle tensioners (and airbag(s)) and driver'sand front passenger's side airbags deployed
1 1-1Open or increased resistance in driver's side airbao inflator(see paqe 23-81)Short to another wire or decreased resistance in driver's side airbaoinflator
(see page 23-82)
11-4Short to power in driver's side airbaq inflator(see oaqe 23-83)I t-5Short to ground in driver's side airbaq inflator{see paqe 23-85)Open or increased resistance in front passenger's side airbaginflator
(see page 23-86)
Short to another wire or decreased resistance in front passenger's
side airbag inflator
(see page 23-87)
12-4Short to power in front passenqer's side airbaq inflator{see Daqe zJ-uu}I z-5Short to ground in front passenger's side airbaq inflator(see oaqe 23-90)13-1Internal failure of the driver's side impact sensor(see page 23-70)
No signal from the driver's side impact sensor(see paqe 23-91)13-4
14-1-7ii,
Faulty power supply to the df,rglllug t Opact s9I99LInternal failure ofthe front passenger's side impact sensor
(see page 23-92)(see page 23-70)
14-3No signal from the front passenger's side impact sensor(see paqe 23-94)14-4Faulty power supply to the front passenqer's side impact sensor(see page 23-95)15-1Faultv OPDS unit or OPDS not initialized(see paqe 23-96115-2Faulty side airbag cutoff indicator circuit(see Daqe 23-99)15-3Faulty OPDS sensor(see oaoe 23-104)
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23-29

ISystem Description
SRS Components
Airbags
The SRS is a safety device which, when used with the seat belt, is designed to help protect the driver and frontpassenger in a frontal impact exceeding a certain set limit. The system consists ofthe SRS unit, including safingsensor and impact sensor (A), the cable reel (B), the driver's airbag (C), the front passenger,s airbag (D). seat belttensioners (l), seat belt buckle tensioners (J), and front impact sensors (K).
Since the driver's and front passenger's airbags use the same sensors, both normally inflate at the same ttme.However, it is possible for only one airbag to inflate. This can occur when the severity of a collision is at the margin, orthreshold, that determines whether or not the airbags will deploy. In such cases, the seat belt will provide sufficientprotection, and the supplemental protection offered by the airbag would be mininal.
Side Airbags
The side airbags (E) are in each front seat-back. They help protect the upper torso of the driver or front seat passenger
during a moderate to severe side impact. Side impact sensors (F) in each door sill and in the SRS unit detect such animpact and instantly inflate the driver's or the passenger's side airbag. Only one side airbag will deploy during a sideimpacl. lf the impact is on the passenger's side, the passenger's side airbag will deploy even if there is no passenger.
Seat Belt and Seat Belt Buckle Tensioners
The seat belt and seat belt buckle tensioners are linked with the SRS airbags to further increase the effectiveness ofthe seat belt. ln a front-end collision, the tensioners instantly retract the belt and buckle firmly to secure the occupantsin their seats.
OPDS
The side airbag system also includes an occupant position detection system (OpDS). This system consists of sensors(G)and an OPDS unit (H) in the front passenger's seat-back. The OPDS unit sends occupant heighl and position data tothe SRS unit. lf the OPDS unit determines that the front passenger is of small stature (for example, a child) and thefront passenger is leaning into the side airbag deployment path, the SRS unit will automatically disable the passenger'sside airbag. The SRS unit will also disable the airbag when the OPDS detects certain obiects on the seat. When theside airbag is disabled, the side airbag cutoff indicator on the instrument panel alerts the driver that the passenger'sside airbag will not deploy in a side impact. When the object is removed, or the passenger sits upright, the side airbagcutoff indicator will go off after a few seconds, alerting the driver that the passenger's side airbag will deploy in a sideimDact.
(cont'd)
I
23-31

sRs
System Description (cont'dl
SRS Operation
The main circuit in the SRS unit senses and judges the force of impact and, if necessary. ignites the inflator charges. lf
battery voltage is too low or power is disconnected due to the impact, the voltage regulator and the back-up power
circuit, respectively, 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 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 Airbagls)
(1) A front impact sensor musl activate. and send electric signals to the microprocessor.
(2) The microprocessor must compute the signals. and depending on the severity of the collision and whether the seat
belt buckle swilch is ON or OFF, it sends the appropriate signals to the airbag inflator(s).
(3) The inflators that received signals must ignite and deploy the airbags.
Side Airbaglsl( 1) A side 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 OPDS unit determines that the tront
passenger's head is in the deployment path of the side airbag.
(3) The inflator that received the signal must ignite and deploy the side airbag.
lw$ad..n sl
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T'sEcttoJn0mP gsfrlctR S oXrVEr S I9oEAiA$ SOtlr&G I
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23-32
\J

sRs
J
a
DTC Troubleshooting
DTC 1-1: Open in Driver's Airbag Inflator
DTC 1-2: Increased Resistance in Driver's
Airbag Inflator
Special Tools Required. SRS inflator simulator 07SAZ-TB4011A. SRS simulator lead F 07XAZ-S230100
1. Erase the DTC memory (see page 23-26).
2. Turn the ignition switch ON {ll), and check that the
SRS indicator comes on for aboul 6 seconds and
then goes off.
Does the SBS indicator stay on?
YES-Go to step 3.
NO Intermittent failure, system is OK at this time.
Go to Troubleshooting Intermittent Failures (see
page 23-26).
3. Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait for 3 minutes.
4. Disconnect the driver's airbag 4P connector (A)
from the cable reel.
07sAz-TB4011A
07xaz-s230100
5. Connect the SRS inflator simulator (2 Q
connectors) and the simulator lead F to the cable
reet.
23-36
6. Reconnect the battery negative cable.
7. Erase the DTC memory.
8. Read the DTC,
ls DTC 1-1 or DTC 1-2 indicated?
YES-Go to step 9.
NO Open or increased resistance in the driver's
airbag inflator; replace the driver's airbag (see page
23-113).t
9. Turn the ignition switch OFF. Disconnect the
battery negative cable, and wait ior 3 minutes.
10. Disconnect the front passenger's airbag 4P
connector from dashboard wire harness B (see step
3 on page 23-21).
1 1. Disconnect both seat belt tensioners 2P connectors
from the floor wire harness (see step 5 on page 23-
22t.
12. Disconnect SRS unit connector A (18P)from the
SRS unit (see step 7 on page 23-22). Do not
disconnect the special tool from the cable reel.

I
DTC s-1, 5-2, 5-4, s-8, 6-3, 6-4,6-7,6-8,7-1,
7-2,7-3, A-1,4-2, 8-3, 8-4, 8-5, 8-6, 9-1, 9-2:
Internal Failure of the SRS Unit
NOTE: Before troubleshooting any of these DTCs, check
the battery/system voltage. lf the voltage is low, repair
the charging system or replace the battery before
troubleshooting the SRS. lf the battery/system voltage
is now OK, ask the customer if the battery ever went
oeao,
1. Erase the DTC memory (see page 23-26).
2. Turn the ignition switch ON (ll), and check that the
SRS indicator comes on for about 6 seconds and
then goes off.
Does the SRS indicatot stay on?
YES Replace the SRS unit (see page 23-122).1
NO Intermittent failure, system is OK at this time.
Go to Troubleshooting lntermittent Failures (see
page 23-26).
l
I
DTC 10-1, 10-2, 10-3, 10-4, 10-s, 10-6, 10-7:
Airbags, Side Airbags, and/or Seat Belt and
Seat Belt Buckle Tensioners Deployed
The SRS unit must be replaced after any airbags and/or
tensioners have deployed (see page 23-122). !
23-69