ECU HONDA CIVIC 2003 7.G Workshop Manual

Gauges
9.
10.
Vehicle Speed Signal Circuit Troubleshooting (cont'dl
Turn the ignition switch OFF.
Connect the other test harness connector (A) to the
VSS (B),
11.Raise the front of the vehicle, and make sure it is
securely supported.
Put the vehicle in neutral with the ignition switch
oN {|| ),
Slowly rotate one wheel with the other wheel
blocked.
Does voltage pulse ttom 0 to about 5 V ot morc?
YES Go to step 14.
NO Replace the VSS.I
't2.
t5.
22-66
14. Disconnect the 22P connector "8" from the gauge
assemDry.
GAUGE ASSEMBLY CONNECTOR B (22P)
Wire side ot female terminals
'15. Connect the positive probe of a voltmeter to the
BLU/WHT wire and the negative probe to ground.
'16. Slowly rotate one wheel with the other wheel
blocked.
Does voltage pulse f rom 0 to about 5 V or more?
YES - Replace the speedometer assembly.I
NO Repair open in the BLUMHTwiTe between
the VSS and the speedometer.l

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.

Airbag Handling and Storage
Do not disassemble an airbag, lt has no serviceable
parts. Once an airbag has been deployed, it cannot be
repaired or reused.
For temporary storage of an airbag during service,
observe the following precautions.
. Store the removed airbag with the pad surface up.
Never put anything on the airbag.
To prevent damage to the airbag, keep it free from
any oil, grease, detergent, or water,
23-15
. Store the removed airbag on a secure, flat surface
away from any high heat source (exceeding 200'Fi
Never perform electrical inspections to the airbags,
such as measuring resistance.
Do not position yourself in front of the airbag during
removal, inspection, or replacement.
Refer to the scrapping procedures for disposal of a
damaged airbag.
(cont'd)

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

I
J
Wiring Precautions
Some of the SRS wiring can be identified by a special
yellow outer covering, and the SRS connectors can be
identified by their yellow color.
Observe the instructions described in this section.
. Never attempt to modify. splice, or repair SRS wiring.
lf there is an open or damage in SRS wiring, replace
the harness.
Be sure to install the harness wires so they do not get
Dinched or interfere with other Darts.
Make sure all SRS ground locations are clean, and
grounds are securely fastened for optimum metal-to-
metal contact. Poor grounding can cause intermittent
problems that are difficult to diagnose.
Precautions for Electrical Inspections
. When using electricaltest equipment, insertthe
probe of the tester into the wire side of the connector.
Do not insert the probe of the tester into the terminal
side of the connector, and do not tamper with the
connector.
Use a U-shaped probe. Do not insert the probe
forcibly.
Use specified service connectors in tro u bleshooting.
Using improper tools cou ld cause an error in
inspection due to poor metal-to-metal contact.
(cont'd)
23-17

sRs
General Troubleshooting Information (cont'dl
Erasing the DTG Memory
Specisl Tool Required
SCS service connector 07PAz-0010100
To erase the DTC(S)from the SRS unit, use a Honda
PGM Tester {see lhe Honda PGfM Tester SRS Vehicle
System Supplement) or the following procedure.
1. Make sure the ignition switch is OFF.
2. Connect the SCS service connector {A) to the MES
2P connector (B). Do not use a jumper wire.
07PAZ-0010100
3. Turn the ignition switch ON (ll).
4. The SRS indicator will come on for about 6 seconds,
and then go off. Remove the SCS service connector
from the MES connector within 4 seconds after the
indicator goes off.
5. The SRS indicator will come on again. Reconnect
the SCS service connector to the MES connector
within 4 seconds after the indicator comes on.
6. When the SRS indicator goes off, remove the SCS
service connector from the MES connector within 4
seconds.
7. The SRS indicator will bllnk two times indicating
that the memory has been erased.
8. Turn the ignition switch OFF, and wait for '10
seconds.
9. Turn the ignition switch ON (ll) again. The SRS js
OK if the SRS indicator comes on for 6 seconds and
then goes off.
23-26
\J
Troubleshooting lntermittent Failures
lf there was a malfunction, but it doesn't recur. it will be
stored in the memory as an intermittent failure, and the
SRS indicator will come on.
After checking the DTC, troubleshoot as follows:
1. Read the DTC (see "Reading the DTC").
2. Erase the DTC memory (see "Erasing the DTC
Memory").
3. With the shift lever in neutral, start the engine, and
let it idle.
The SRS indicator will come on for about 6 seconds
and then go off.
Shake the wire harness and the connectors. take a
test drive (quick acceleration, quick braking,
cornering), turn the steering wheel fully left and
right, and hold it there for 5 to '10 seconds. lf the
problem recurs, the SRS indicator will come on.
lf you can't duplicate the intermittent failure, the
system is OK at this time.
4.

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

A
\'l9
Driver's Airbag Replacement
Removal
1. Disconnectthe battery negative cable, and wait atleast 3 minutes before beginning work.
2. Remove the access panel (A) from the steering
wheel, then disconnect the driver's airbag 4p
connector (B)from the cable reel.
Remove the maintenance cover (A), then remove
the two Torx bolts (B) using a Torx T3O bit.
Disconnect the horn switch connector (1P) (D).
Remove the driver's airbag (C).5.
lfc
23-113
Installation
1. Connect lhe horn switch connector (1P) to thedriver's airbag.
2. Place the new driver's airbag (A) inthesteering
wheel, and secure it with new Torx bohs (B), and
installthe maintenance cover (C).
a9.8 N.m {1.0 kgf.m, 7.2 lbt.ft)
Connect the cable reel to the driver's airbag 4P
connector (A), then installthe access panel (B) on
the steering wheel.
Connect the battery negative cable.
After installing the airbag, confirm proper system
operation:
. Turn the ignition switch ON (ll); the SRS indicator
should come on for about 6 seconds and then go
off.. Make sure the horn works.
4.
5.

)Side Airbag Replacement
)
NOTE: Review the seat replacement pro6edure in the
Body section before pertorming repairs or service.
Removal
1. Disconnectthe battery negative cable, and wait atleast 3 minutes before beginning work.
2. Disconnect the side airbag harness 2P
connector {A).
Remove the seat assembly (see page 20-71) and
seat-back cover (see page 20-75).
Remove the mounting nut (A) and the side
airbag (B).
3.
l,o
23-115
Installation
NOTE:. lf the side airbag lid issecured byatape, removelhe
rape.. Do not open the lid of the side airbag cover.. Use new mounting nuts tightened to the specified
torque.. Make sure that the seat-back cover is installedproperly, lmproper installation may prevent proper
deployment.. Be sure to install the harness wires so that they arenot pinched or interfering with other parts.
1. Place the new side airbag on the seat-back frame(A). Tighten the side airbag mounting nuts (B).
2. Installthe seat-back cover {see page 20-75).
3. Installthe seat assembly (see page 20-71), then
connect the side airbag harness 2P connector.
4. Move the front seat and the seat-back through their
full ranges of movement, making sure the harness
wires are not pinched or interfering with other parts.
5. Reconnect the battery negative cable.
6. After installing the side airbag, confirm proper
system operation;Turn the ignition switch ON (ll);
the SRS indicator should come on for about 6
seconds and then go off.

sRs
Airbag Disposal
Special Tool Required
Deployment tool 07HAz-SG00500
Before scrapping any airbags, side airbags, seat belt
tensioners, or seat belt buckle tensioners (including
those in a whole vehicle to be scrapped), the airbags,
side airbags, seat belt tensioners, or seat belt buckle
tensioners must be deployed. lf the vehicle is still within
the warranty period, the Honda District Service
Manager must give approval and/or special instruction
before deploying the airbags, side airbags, seat belt
tensioners, or seat belt buckle tensioners. Only after the
airbags, side airbags, seat belt tensioners, or seat belt
buckle tensioners have been deployed (as the result of
vehicle collision, for example), can they be scrapped.
lf the airbags, side airbags, seat belt tensioners, and
seat belt buckle tensioners appear intact (not deployed),
treat them with extreme caution. Follow this Drocedure.
Deploying Airbags in the Vehicle
lf an SRS equipped vehicle is to be entirely scrapped, its
airbags, side airbags. seat belt tensioners. and seat belt
buckle tensioners should be deoloved while still in the
vehicle. The airbags, side airbags, seat belttensioners,
and seat belt buckle tensioners should not be
considered as salvageable parts and should never be
installed in another vehicle.
1. Turn the ignition switch OFF, then disconnect the
battery negative cable, and wait at least 3 minutes.
2. Confirm that each airbag, side airbag, or seat belt
tensioner is securely mounted.
3. Conf irm that the specia I tool isfunctioning properly
by following the check procedure on the tool label.
23-116
$J
Driver's Airbag:
4. Remove the access panel f rom the steering wheel,
then disconnect the driver's airbag 4P connector
from the cable reel (see step 2 on page 23-21).
Front Passenger's Airbag:
5. Lowerthe glove box, then disconnectthe front
passenger's airbag 4P connector from dashboard
wire harness B (see step 3 on page 23-211.
Side Airbag:
6. Disconnect the side airbag 2P connectors from the
floor wire harness (see step 4 on page 23-211.
Seat belt tensioner:
7. Disconnect the seat belt tensioner 2P connectors
from the floor wire harness {see step 5 on page 23-
22). Pull the seat belt out all the way, and cut it off.
Seat belt buckle tensioner:
8, Disconnect the seat belt buckle tensioner 4P
connectors from the floor wire harness (see step 6
on page 23-221.